Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: rose on January 23, 2008, 09:48:37 AM

Title: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 23, 2008, 09:48:37 AM
HELLO

I am on my way in making my first robot and so i want something that is not that complicated like a robot w/out microcontrollers. I found the info on the net robotroom.com of david cook. There is no exact info I can use, like no specific parts and step by step instructions. Another one is there is no circuit schematic diagram. And also, I need this for our requirement before graduation in our physics class. It is due on February 07, 2008.

Any help will be much appreciated...
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Ro-Bot-X on January 23, 2008, 10:17:52 AM
It's all in his first book, Robot Building
for Beginners.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: arsenius on January 23, 2008, 02:03:48 PM
I just bought that as an ebook (pdf) from apress.com (http://apress.com/book/view/1893115445).
Check it out, it's worth it for $15 (cheaper than amazon).
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 23, 2008, 06:26:03 PM
tnx 4 ur response!!!

can u pls send d schematic circuit, i don't have money to buy the book. Actually i've been searching 4 a week now, n its keeping me crazy. So please help me build my first robot.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Bubbles on January 23, 2008, 09:23:11 PM
if u want to make a robot without a microcontroller why not check out the $40 dollar robot tutorial on this site (i don't think it needs an mcu) also, if u r having difficulty coming up with $15 dollars for an e-book you are probably going to find it hard to come up with enough money for a robot
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 24, 2008, 12:25:43 AM
yea normally you will spend about $100 for your first


~smash
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 24, 2008, 02:39:14 AM
I can't afford a $15 book because I have many requirements 2 submit b4 graduation and my money isn't dat many 2 include d book.

According 2 my research of the sandwich robot, dis r d parts:
2 1k Resistors
4 150ohm Resistors
2 20k Trimpots
3 1N5818 Diodes
1 LM393 Op-Amp
2 2N2907 Transistors
8 High Intensity LEDs
1 Power Switch
1 330µF Electrolytic Capacitor
1 0.1µF Capacitor
4 CDS Cells
1 SWT7 Dark/Light sensor config switch
4 #2-56 x 3/4" Bolts and Nuts for mounting
1 8-Pin Dip IC Carrier
1 SandPCB - Sandwich PCB
2 Gear Motors
2 Gear Motor Plastic Wheels

If u'll buy a kit on d net, it will cost u $75. But in hir, in the philippines, d parts r only $20. The problem is I do not know how to do it.

So pls, i need ur help about dis...
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 24, 2008, 03:31:11 AM
i still sugest the $40 robot.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on January 24, 2008, 07:21:00 AM
listen rose

the sandwich robot is just a line follower robot using comparators , search for schematics for those type of lien followers
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on January 24, 2008, 07:29:56 AM
This is basically the same as the sanwich robot
http://www.seas.upenn.edu/~ese111/robot/Robot.html (http://www.seas.upenn.edu/~ese111/robot/Robot.html)

also the 40 dollar robot is good and very well documented
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 24, 2008, 09:15:46 AM
I would still be doing sandwich robot, i just need to study some of the information I've gathered n given by some of you out there...

But I have another problem, the circuit board. How can I make a point to point wiring? Because I'm pretty sure I can etched at dis tum, I don't have any background about it.

Again, I'm asking 4 Ur help about other things I needed to know 2 build dis robot before d submission on Feb 6. Please help! If there is someone who can give me ALL the names of the parts needed and d full step by step intructions, I WILL APPRECIATE IT VERY MUCH! I AWE YOU MY GRADUATION! THANKS!!!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on January 24, 2008, 09:37:43 AM
I say go with the $40 robot as I don't think anyone on this site has done sandwich bot. I think it is highly unlikely that u will be able to get sandwich bot done before february 7th because it is not documented well. 
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on January 24, 2008, 04:55:49 PM
unless you jsut buy the e book   ;)
it has full isntructions

OR build the fricken 40 dollar robot!  :D
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 24, 2008, 05:42:06 PM
yay! up with the $40 robot!! power to the poor! ;D


~smash
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on January 24, 2008, 05:52:52 PM
 smash can i see your version of the 40 dolalr robot u built
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Bubbles on January 24, 2008, 06:13:46 PM
yeah. unless you HAVE to do the sandwich robot for some reason or another i would go $40 robot as it is well documented and i am sure you can do it before the due date.

I say go with the $40 robot as I don't think anyone on this site has done sandwich bot. I think it is highly unlikely that u will be able to get sandwich bot done before february 7th because it is not documented well. 

exactly  :P
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on January 24, 2008, 07:36:54 PM
here is the link to the $40 robot incase you couldn't find it! http://www.societyofrobots.com/member_tutorials/node/59
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 24, 2008, 07:56:52 PM
yea i've looked around the net and cant find any good instructions that are free for the sandwhich bot..


~smash
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 25, 2008, 03:00:39 AM
here is the link to the $40 robot incase you couldn't find it! http://www.societyofrobots.com/member_tutorials/node/59

tnx 4 d link... I don't understand wat everyone is saying because i didn't see dis yet. But now, since I've found dis, i think its easier n cheaper. Thanks a lot for ur help. It is well documented.

Can I still asked u about certain things about dis $40 robot, wen I don't understand something???

THANK YOU VERY MUCH!!! U REALLY HELP ME.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: ed1380 on January 25, 2008, 07:05:56 AM
np. that's what we're here for.

if you have some time you can read up a bit. and it's free;
http://rapidshare.com/files/84939931/Wiley_-_Electronics_For_Dummies_-_2005_-__By_Laxxuss_.pdf
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on January 26, 2008, 06:20:05 PM
Quote
Can I still asked u about certain things about dis $40 robot, wen I don't understand something???
Yes, of course, please do.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 26, 2008, 11:36:16 PM
can I use a motor from a tamiya lets go? I can't find 100 rpm dc motor...

can d $40 make a sharp turns? i want to make the traking field to be challenging 4 d robot lyk a spiral maybe...
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 26, 2008, 11:58:30 PM
yes it can. and check the reply i sent you.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: lego-robot on January 27, 2008, 12:56:28 AM
yes i would say it would be able to make sharpish turns but it might be a bit slow. as for a spiral it should get around that quite easily but just dont put the lines to close to each other because it can sometimes jump them.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 27, 2008, 02:14:50 AM
how about the photoresistor?

wat else can i substitute if i can't find a cds photoresistor?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 27, 2008, 02:49:42 AM
umm...photoresistors are one of the most available parts. you should be able to get them.

~smash
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 27, 2008, 03:52:26 AM
ok, i think i can find dem. I will buy all d parts 2m.

May I ask? I have wheels hir but they r not 7.5diameter, I think dey r just 4 diameter. Can I use dem for my $40 robot?

Tnx 4 ol those who helped and still helping!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 27, 2008, 04:30:19 AM
ok, i think i can find dem. I will buy all d parts 2m.

May I ask? I have wheels hir but they r not 7.5diameter, I think dey r just 4 diameter. Can I use dem for my $40 robot?

Tnx 4 ol those who helped and still helping!

Another 1 is, how can i add music to it? Its d 1st robotics exibition in school, so it should be cool and amazing, ryt? So help me pls. Step by step instruction please!!!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 27, 2008, 04:39:31 AM
hmm that might be hard.. i think the easiest way would be to put some sort of switch in beween a cheap 128mb mp3 player and some sort of trigger. maybe a break in the line? that would be wiked tho :) anyways i have done this before with a line follower and thats what i did. but i didnt have the knowledge i had today and i broke everything  >:( oh well...good luck


~smash
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Bubbles on January 27, 2008, 05:08:23 AM
ok, i think i can find dem. I will buy all d parts 2m.

May I ask? I have wheels hir but they r not 7.5diameter, I think dey r just 4 diameter. Can I use dem for my $40 robot?

Tnx 4 ol those who helped and still helping!

Another 1 is, how can i add music to it? Its d 1st robotics exibition in school, so it should be cool and amazing, ryt? So help me pls. Step by step instruction please!!!

first of all is to actually measure the wheels so that you can figure out if they are in fact big enough. to do this i would:

1. find out how far away the bottom of your wheels will be from the bottom part of the chassis (to be more accurate, do this mathematically instead of guestimation)

2. take that and minus the height of any objects under the chassis then the number left over is approximately the maximum height of an object you can drive over (as long as the objects' length is less than or equal to the length of the robot, otherwise it will just drive up it at an angle and it doesn't matter) i.e. rock, speed bump

3. funny third thing (yet to be implemented)  :P

if any of this is wrong pls tell me and i am srry but it is late  :P
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 27, 2008, 05:28:02 AM
lol bubbles im still up  ;) have you been watching tennis? and i had a problem when i didnt measure the space underneath. i had a 1.8cm clearance  :P

~smash
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 28, 2008, 05:22:16 AM
okay thanks for all the response!!!

I bought all the needed parts. But there are still left that the seller can't understand.

Can I ask another thing? Wat is d size of the LDR/photoresistor? 3? 5? 7?

I can't find L293D, what is this? Any information for me to know it better?

How about the male header pins?

By the way, I used 4- 5mm orange LED because its 10x cheaper than the Blue LED. And 4- 20K Trimmer because according to the seller, the one in the drawing is a trimmer and not a preset. So, i bought the trimmer.

And, 2- 0.22 Uf mylar capacitor instead of capacitor because there is no available. is IT OKAY?

Thats the only parts needed to buy for tomorrow, so I'm asking for your help, once again. Thank You.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on January 28, 2008, 09:35:52 AM
male header pins can be found on digikey www.digikey.com and the L293D appears to be a motor driver chip http://www.solarbotics.com/assets/documentation/kit10.pdf
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 29, 2008, 03:39:36 AM
ok the hsomethingD is an H-bridge male header pins are used to connect wires. the size of the photoresistor really matter to much i used 3 because it was the cheapest :P . i think the l.e.d should be fine... the capasatator i dont think it will matter but im not sure.  and that thing is a preset but the trimmer will work as ed said.
hope it helped.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: paulstreats on January 29, 2008, 05:07:35 AM
Quote
ok the hsomethingD is an H-bridge male header pins are just pins. used to hold something in place. the size of the photoresistor doesnt matter too much. i think the l.e.d should be fine... the capasatator i dont think it will matter but im not sure.  and that thing is a preset you do need one! a trimmer probibly wont work!!
hope it helped.

Smash, you just repeated what other people have said.

The trimmer WILL work, and it IS the same thing as a preset.

The male header pins arent "used to hold something in place", they are used to connect wires to.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 30, 2008, 08:30:15 AM
any substitute for L293D (motor driver)? I can't find here in the Philippines! Please reply immediately!!!

Thanks for all your response. It really helps.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Ro-Bot-X on January 30, 2008, 11:28:29 AM
Yes, SN754410. Same pinout, more power (1 amp per motor).
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 30, 2008, 03:11:00 PM
couldnt you just get it shipped out? i got mine from thailand for 45c im in australia. theyre like 2cm by 1cm
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Bubbles on January 30, 2008, 10:46:19 PM
couldnt you just get it shipped out? i got mine from thailand for 45c im in australia. theyre like 2cm by 1cm

well from what i've read i believe that she needs it done rather quickly so shipping wouldn't really be much of an option
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on January 30, 2008, 10:49:42 PM
oh ok never mind
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 31, 2008, 12:48:32 AM
are the L293D and 16 dip socket the same? If not where should I place the other to the other?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 31, 2008, 02:40:19 AM
I rellay can't find L293D motor driver and a SN754410. What can I do? The submission is on Feb. 6. Its a requirement for graduation, what will happen if i didn't make it. No graduation? Please HELP!!!

Is the part really needed or can I just ignore it? Is the motor driver same as the 16 pin DIP socket? Because they look the same. ???
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on January 31, 2008, 05:43:24 AM
You can replace the L293D  in the circuit with a high power NPN  transistor for black line following or a high power PNP transistor for black line following.
Common high power NPN transistors are 2N2222, SL100 and D880.
If you are using transistors in place of L293D, slight modification of the circuit, as shown below, is required
(http://b.imagehost.org/t/0036/image002.jpg) (http://b.imagehost.org/view/0036/image002.jpg)
But by using transistors you can only build a line follower.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on January 31, 2008, 05:44:49 AM
There is also an advantage of using the above circuit instead of using the L293d. The speed of the motor will be proportional to the distance between the sensor and the edge of the line. When the sensor is in the center of the line the motor corresponding motor brakes. The speed of the motors gradually increases as the sensor moves away from the edge of the line. This way the robot will be able to follow the line better.
 
I myself not tested the above circuit, but it should work.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 31, 2008, 06:48:25 AM
Thanks for that! :D

Now, I have to ask about the male header pins, any substitute for them? Please answer as soon as possible.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on January 31, 2008, 08:36:28 AM
If you are using the circuit given in my previous reply, you do not need any header pins.   
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on January 31, 2008, 07:15:08 PM
You can replace the L293D  in the circuit with a high power NPN  transistor for black line following or a high power PNP transistor for black line following.
Common high power NPN transistors are 2N2222, SL100 and D880.
If you are using transistors in place of L293D, slight modification of the circuit, as shown below, is required
(http://b.imagehost.org/t/0036/image002.jpg) (http://b.imagehost.org/view/0036/image002.jpg)
But by using transistors you can only build a line follower.

If you are using the circuit given in my previous reply, you do not need any header pins.  

There is no pin, are you sure? Is in it that the pins hold the socket and the socket is overlapping with the L293D? Please let me see a edited picture of what your talking about, just like removing the L293D amd replacing it to the transistors. Just want to see how it look like, let me see where to put the transistors. PLEASE!!!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Raad on February 02, 2008, 07:53:39 AM
al salam alaikum ,
hello all ! , my name is Raad , i am new to SOR .. i have a question about this $40 dollar line follower .. I've built the circuit and after spending a long day doing so , i get a new 9V battery and hook it on , i was happy the motors were kicking .. didn't ever get the chance to hold the sensors when  2 LED's blew up and broke !. any explanation to this ?and another Question that i might be doing wrong .. the last four cables that are suppose to switch the robot from black line to white line follower ,, i cant see where two of them hook up ?! ??? plus one goes under the board and no clear explanation to that ! .. please help :D:D
thank you for a very lovely circuit
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on February 02, 2008, 09:53:48 AM
do you have the right resistors hooked up? If you do not have a resisitor or if you do not have the right value of resistor the leds will blow up. look at the color bands on the resistor to see if its the right resistance
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 02, 2008, 04:27:36 PM
yea lol i was confuzzled when i got mine because the ones in the tutorial are green and mine are baige. werid. lol luckily i printed off a few resistor charts in my time ;)
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: paulstreats on February 02, 2008, 04:33:27 PM
The actual case color and size depends on the ratings such as quarter watt etc... you can get a 330ohm resistor for a lot of different ratings
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 02, 2008, 04:35:14 PM
O_o i thought it was 270ohm?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 02, 2008, 07:38:26 PM
O_o i thought it was 270ohm?

they are both fine

270 ohm will make the LED brighter , i use 220 ohm for my LEDs
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 02, 2008, 08:22:22 PM
ohh ok thanks eric. i always seem to confuzzle myself around exams.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 02, 2008, 09:01:17 PM
ohh ok thanks eric. i always seem to confuzzle myself around exams.
http://www.societyofrobots.com/robotforum/index.php?topic=3131.0 (http://www.societyofrobots.com/robotforum/index.php?topic=3131.0)

use the program described in that post for those type of calculations ( like for LED resistors)
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 02, 2008, 09:18:45 PM
ok thanks airman
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on February 03, 2008, 03:03:01 AM
is it normal if my roboot is all done but doesn't have an L293D and not moving? I still can't find a motor driver until now, all things are assembled but it is not moving... is it because it doesn't have a L293D? or will it move even if theres no motor driver?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on February 03, 2008, 03:43:35 AM
You can switch to the circuit given in one of my previous replies to this post. It uses a transistor to drive the motor instead of a L293D. So you don't need any motor driver to control your motor.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Raad on February 03, 2008, 03:52:30 AM
thank you for the fast reply .. well .. i got 3 resistors in the circuit one that goes with the first green LED and two with the red LED's .... having the blue LED's in parallel and connecting directly to the node where the Vcc comes in would give each a 9V supply! .. now i changed the lights and tried a 5V supply .. lights are on but now only one motor is working .. and when i flip the selector wires the other one works.. !!

"I advice you to add a 270 ohms resistor between the red wire from the sensor board and Vcc(red wire of the battery clip) to limit the current reaching the LEDs. I have not fried a single LED but some SOR members have fried their LEDs for not having used the resistor. "

i did not use that advice .. maybe its time to do so ..lol after 8 LED's ..

this leaves one problem ...the last 4 wires .. that are shown in the last two pictures of the tutorial .. i cannot make where they come from !.. can someone explain it please ? .. is there any pictures from the ones who built this robot ?
thank u  :D:D
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 03, 2008, 04:05:46 AM
by the last wires do you mean the ones that come from the resistors and change whether it is black or white line? also could someone tell me how i make it obstical avoider!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on February 03, 2008, 04:07:09 AM
this leaves one problem ...the last 4 wires .. that are shown in the last two pictures of the tutorial .. i cannot make where they come from !.. can someone explain it please ? .. is there any pictures from the ones who built this robot ?
thank u  :D:D

I think you are taking about the four red wires in the last two photos of the tutorial.
Two of the wires are connected to Vcc(red wire of the battery clip). The other two are connected to the 1K resistor. More information about the wires is given in the electronics section of the tutorial.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 03, 2008, 04:10:53 AM
so do two of the wires attach to the pos+ terminal? and how do i make it obstical avoider? do i bend the front bit lol
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on February 03, 2008, 04:16:33 AM
could someone tell me how i make it obstical avoider!

Using photoresistors it can only avoid shadows cast by objects. The method is explained in the last section of my tutorial.
I'm currently upgrading the sensors from photoresistors to IR sensors. This will enable the robot to do better obstacle avoiding. I'm also planning to use the IR sensors to do wall following and edge avoiding. After the upgrade the robot can do line following, obstacle avoiding, wall following , edge avoiding and can also can be used as a photovore and photophobe.

I guess you will have to wait for some time, until I post a tutorial about the upgrade, if you want the robot to avoid l obstacles and not their shadows.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 03, 2008, 04:20:35 AM
Using photoresistors it can only avoid shadows cast by objects. The method is explained in the last section of my tutorial.
I'm currently upgrading the sensors from photoresistors to IR sensors. This will enable the robot to avoid objects better. I'm also planning to use the IR sensors to do wall following and edge avoiding. After the upgrade the robot can do line following, obstacle avoiding, wall following , edge avoiding and also can be used as a photovore and photophobe.
oh ok lol ill wait
I guess you will have to wait for some time, until I post a tutorial about the upgrade, if you want the robot to avoid l obstacles and not their shadows.
i guess ill play the waiting game lol naa ive got some old stuff i can play around with. be sure to send me a e-mail when its done ;)
add on: i think i basicly understand how it works with the shadow thing. thanks. i might try to make a tut on a robot if i have to much spare time on my hands (very unlikely i've got exams on right now) and i work most weekends. where does all my time go! ::)
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Raad on February 03, 2008, 04:25:19 AM
"Solder the remaining two wires to the red wire of the battery cap.
With this the circuit board is complete. The graphical soldering and wiring diagram is given below."

excuse my inpatients , i rushed it and missed a few lines in the tutorial ! ..

so the last two input wires come from Vcc direct ...in the pictures those two have two more coming out of the same spot ?.. or looks like its going to the capacitor and the other looks like its going under from the side?

i am looking forward to ur upgrade .. :D:D
thank you for your fast replay .. did rose get to finish his/her robot ?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 03, 2008, 04:28:04 AM
its a her i think. but i dont want to make the same mistake i did with admin :-[ i saw admins lady friend and thought it was admin lol anyways back on topic. i thought two wires went into the resistors?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Raad on February 03, 2008, 04:37:38 AM
well there is 4 !!! now i got u all confused .. in the last 2 pictures u can see them clearly ..

 "Solder two of these wires to the 1K resistors. From these wires we will get high or low inputs from the sensors to drive the motor

         Solder the remaining two wires to the red wire of the battery cap.
         With this the circuit board is complete. The graphical soldering and wiring diagram is given below. "

going to get 4 new blue LED's .. hope all turns out well :(
thank you all for your help .. see u soon:D:D
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: SmAsH on February 03, 2008, 05:03:10 AM
see me soon?? STALKER!!! lol jk anyway that cleared some things up for me.... once you see my soldering job youll understand how bad i am!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on February 03, 2008, 06:23:26 AM
.
You can switch to the circuit given in one of my previous replies to this post. It uses a transistor to drive the motor instead of a L293D. So you don't need any motor driver to control your motor.

I'm done connecting all the wires and it is assembled already, so if i will use the transistors, will I need to go back from the start? Cause its all done n the only thing i must do is overlay the L293D to the 16 DIP socket
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Pratheek on February 03, 2008, 06:36:42 AM
No, there is no need for you to redo the circuit board. Just solder the transistors to the board and connect the motor as shown in the circuit(which is given in my previous post). Do not forget to add diodes across the transistor, this will prevent unwanted power spikes from reaching the circuit.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: hate_forever143 on February 03, 2008, 09:29:16 AM
can the $40 robot can detect a line as well as obstacles in its path and avoid it and trace the line again...???
pls help as it is a task in a competiton....
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 03, 2008, 12:23:04 PM
can the $40 robot can detect a line as well as obstacles in its path and avoid it and trace the line again...???
pls help as it is a task in a competiton....

no it cannot


your competition is robocup junior rescue , im assuming?
http://www.societyofrobots.com/member_tutorials/node/55 (http://www.societyofrobots.com/member_tutorials/node/55)
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on February 03, 2008, 04:15:17 PM
what kind of diodes do i need? and how many? ???
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 03, 2008, 04:20:58 PM
what kind of diodes do i need? and how many? ???


regular diodes  NOT zener diodes

get one for every transistor ,


but remember the circuit will work without the diodes, they just provide protection
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on February 03, 2008, 04:25:58 PM
Thank you so much!!!

I'm planning to finifh it now...

What is the value of diodide? No code, so i can buy it easily...
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 03, 2008, 04:36:15 PM
which supplier do you want to order the diode from?


p.s. please don't message me about new replies to threads , its annoying
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 03, 2008, 04:40:14 PM
well actually search the diodes yourself, i need to go now ill be back later

they are 1N4148 diodes
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: rose on February 04, 2008, 06:12:30 AM
I'm all done!!! I used the new circuit given by pratheek, but still it is not moving!!! what can be the problem? the deadline is two days from now and i'm running out of time!!! need ur help, IMMEDIATELY!!!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on February 04, 2008, 10:18:24 AM
double check your soldering and calm down.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Raad on February 05, 2008, 04:20:15 AM
funny rose! on the edge! ... relax
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: hate_forever143 on February 05, 2008, 12:14:22 PM
can any one help me to detect obstacles in the path of the $40 line following robot. what further additions will i need to make.
pls give me the details of the ckt for obstacle detection.
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 05, 2008, 06:14:28 PM
you'll need a microcontroller
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: Trumpkin on February 05, 2008, 08:35:05 PM
$50 robot.  ;D http://www.societyofrobots.com/step_by_step_robot.shtml
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: hate_forever143 on February 06, 2008, 07:02:45 AM
will you pls post the ckt diag and the other details....
what will i have to do if i want to club it with the $40 robot...
pls reply soon.
my contest is within 10 days
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 06, 2008, 10:18:33 AM
follow my 3-in1 robot tutorial

I'll post the circuit instructions tonight

What is your budget


and is it for robocup junior rescue?
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: hate_forever143 on February 06, 2008, 11:49:54 AM
my budget is upto $100 or a little more n its not for the robocop junior rescue.
the competition is in India. so pls help...!!
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: hate_forever143 on February 06, 2008, 12:47:54 PM
how much did your 3 in 1 robot cost...??
n can help to build a remote controlled car for racing....??
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: airman00 on February 10, 2008, 10:07:57 PM
how much did your 3 in 1 robot cost...??
n can help to build a remote controlled car for racing....??

I never actually calculated the cost yet

All together for parts only ... I'd estimate less than 150 bucks


r/c car for racing - just buy a kit ! :D
Title: Re: URGENT!!! anyone out der who made a sandwich robot, a line follower?
Post by: garriwilson on February 10, 2008, 10:15:30 PM
Baja king Buggy Kit: http://www3.towerhobbies.com/cgi-bin/wti0161p?&I=LZ0436**

I was going to make this but then I decided not to.

Quote
REQUIRES:
Assembly
2-Channel Radio
2 standard size servos
6 cell 7.2V battery pack & charger
Polycarbonate Paint (Tamiya) (have to get this)
CA glue and building tools (and this too)
Things I crossed out are included (don't know why they put that in the required section  :-\ )

For the paint, get the colors you want your car to be, and CA glue, and building tools like these:

http://www3.towerhobbies.com/cgi-bin/wti0006p?&T=3&I=TAMC0832

On that site don't get the charger. And you probably have the screwdrivers and some snips. Just check off everything you have, and get the stuff you don't.

Hope that helps.