Author Topic: URGENT noob question....fr competition... (Read 1849 times)

intwizs · « **on:** June 27, 2009, 09:47:40 PM »

i started making the 40$ line follower...
i need to make a bot which follows white lines and also avoid obstacles....
but the circuit is such that either it can follow white lines
(OR)
it can follow black lines+avoid obstacles....

and also, i couldn't get CdS photoresistors......can i use phototransistors as well? with the same circuit?

intwizs · « **Reply #1 on:** June 27, 2009, 10:47:49 PM »

hw cme ppl are jst viewing the post nd not answering...hello anyone ther?

SmAsH · « **Reply #2 on:** June 27, 2009, 10:53:51 PM »

it has only been viewed 16 times! be patient! and for the love of god, use spell checker!

you can use phototransistor but you will have to change a few things...
you could use a sharp ir sensor for the obstacle detection possibly on a servo.
what do you want it to do if it runs into an obstacle?

intwizs · « **Reply #3 on:** June 27, 2009, 11:02:35 PM »

i want it to avoid the obstacle and keep moving on the line.....
i cant afford servos...they r way too costly here.....i already have parts from my previous bot.....

im making another line following robot by following the other tutorial as well....
but it needs a servo, what can i do to a DC motor to make it run autonomously?--s in under a programmed microcontroller....

SmAsH · « **Reply #4 on:** June 27, 2009, 11:03:58 PM »

okay, im confused...
what parts do you have from your old bot? and what is your budget for this robot?

intwizs · « **Reply #5 on:** June 27, 2009, 11:12:38 PM »

budget huh? well, within 3k
one servo costs 1.2k here, dc motors are cheaper

i have 4 DC motors, they're of low rpm so they're best suited for line following right?
a chassis, wheels, an RC, and a circuit (i forgot what IC its based on--cuz a partner has it)

SmAsH · « **Reply #6 on:** June 27, 2009, 11:13:35 PM »

okay... what currency we talking here?

intwizs · « **Reply #7 on:** June 27, 2009, 11:16:43 PM »

ruppees...lol..why is that relevant?
I'm willing to put in the work, I gotta win a couple of competitions

intwizs · « **Reply #8 on:** June 27, 2009, 11:37:34 PM »

hello?
any actual help?pls

Metal Slug 2 · « **Reply #9 on:** June 28, 2009, 12:51:12 AM »

Quote from: intwizs on June 27, 2009, 11:02:35 PM

i want it to avoid the obstacle and keep moving on the line.....
i cant afford servos...they r way too costly here.....i already have parts from my previous bot.....

im making another line following robot by following the other tutorial as well....
but it needs a servo, what can i do to a DC motor to make it run autonomously?--s in under a programmed microcontroller....

Try buying a servo from ebay with free shipping. To control a DC motor you need either two h-bridges (per motor) or a motor driver. As for a microcontroller to get the job done, are you building the $50 robot?. if you are, good, it will work for your robot. If you arent, you can buy a nearly complete kit (no servos or battery) for it here: http://www.circuitgizmos.com/products/cgsorkit1/cgsorkit1.shtml . But then you will also need a programmer, look on the $50 robot tutorial.

btw, knowing your currency is very relevant. Most members of SoR relate to any product in USD. Therefore if you state you have a 3k budget, we may just assume you have 3k USD, and not 3k rupees. You can see what problems that may cause...

intwizs · « **Reply #10 on:** June 28, 2009, 01:05:11 AM »

alrite so with a motordriver+Dcs, means i dont need a servo rite?

motordriver is the one wid L293D IC? I mean, ive made a circuit based on it i.e the one in the 40$ line following robot tutorial......

sonictj · « **Reply #11 on:** June 28, 2009, 01:22:21 AM »

Quote

alrite so with a motordriver+Dcs, means i dont need a servo rite?

motordriver is the one wid L293D IC? I mean, ive made a circuit based on it i.e the one in the 40$ line following robot tutorial......

A motor driver (H-bridge) is what is required to generate enough current to drive a motor. A servo has this internally. You need to know how much current your motors pull. An l293d is a .6 amp motor driver intended for small dc motors. if your motors draw too much current you will blow the l293ds.

I don't understand why you need servos. Servo's are just gear motors with a convenient interface.

oh and looking at a few of your posts here I think you should take a look at this
http://www.societyofrobots.com/robotforum/index.php?topic=1480.0

intwizs · « **Reply #12 on:** June 28, 2009, 01:45:00 AM »

listen...im making two robots...
one that has a microcontroller.....
that one requires servos right? do DC motors have the capability to directly run under microcontrollers?
thats why im askin

SmAsH · « **Reply #13 on:** June 28, 2009, 01:47:52 AM »

a microcontroller cannot control dc motors directly. the motors draw too much current and fry the pin.
they require an h-bridge or motor driver. a servo is basically a dc motor with a gearbox, motor driver and feedback in a small, neat package.

intwizs · « **Reply #14 on:** June 28, 2009, 01:49:50 AM »

so its possible to connect a motor driver to a couple of geared DC motors and make them run under a program right?---for any possible circuit?
thats all I need

SmAsH · « **Reply #15 on:** June 28, 2009, 02:19:36 AM »

yes, you can have a robot with an mcu, motors, wheels, motor controllers, sensors and a regulated supply.

intwizs · « **Reply #16 on:** June 28, 2009, 02:22:03 AM »

so do i look for something specific in the motor driver im gonna buy?
all of them come suited for 4 motors right?

intwizs · « **Reply #17 on:** June 28, 2009, 05:09:41 AM »

i cant find a motor driver that can support 4 motors and run on a toy RC.......
I found AVR based boards for controlling the bot
but I want to use my own microcontroller and I need the motor driver so that I wont have to use servos
What to DO?

SmAsH · « **Reply #18 on:** June 28, 2009, 05:23:22 AM »

please don't send me a pm asking me to reply to this post, there are other people who can answer too

for most small robots two motors will do fine. check out the l298 or l298d.
if it is a robot why do you want rc? i think it will be quite useless for this project...
what do you mean by "your own microcontroller"? it would be easiest to use something like an atmega8 as in the $50 robot tutorial.

intwizs · « **Reply #19 on:** June 28, 2009, 05:28:34 AM »

alright....tis is helpful...i think i can go on wid tis mch info.....
ty soo mch.....

jamort · « **Reply #20 on:** June 28, 2009, 10:43:27 AM »

*URGENT*
you know every question you asked are answered in the basic tutorials on here give them a rad you may be suprised

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