Author Topic: CAD of new Robot (need help) (Read 5875 times)

creedcradle · « **on:** October 20, 2007, 04:21:22 AM »

This is just the CAD of the chassis, simple enough...Target Date of accomplishment will be on December..

Later i will add: the RF receiver, sensor for for obstacle avoidance, ground contact sensor, and temperature sensor.. and if my pocket would be kind.. i will add a camera on this robot..

TOp view:

Trimetric view:

Isometric view:

Dynamic view:

Soon i will post the schematic but i will post no source codes.. i will do this robot without any microcontroller involved...

Steve Joblin · « **Reply #1 on:** October 20, 2007, 07:43:44 AM »

why no microcontroller? Is it just for the "challange" factor?

Your CAD's are nice, but one thing that always frustrates me with these is that there are no measurements... how big/small will it be?

creedcradle · « **Reply #2 on:** October 20, 2007, 03:42:49 PM »

Quote from: Steve Joblin on October 20, 2007, 07:43:44 AM

why no microcontroller? Is it just for the "challange" factor?

yes. i cant find a reason why use microcontroller when the tasks of the bot are simple.

Quote from: Steve Joblin on October 20, 2007, 07:43:44 AM

Your CAD's are nice, but one thing that always frustrates me with these is that there are no measurements... how big/small will it be?

I have the complete measurements for this CAD bot. i will post it later... im trying to figure out how to shrink the file. the entire sheet would occupy a big space..

paulstreats · « **Reply #3 on:** October 20, 2007, 04:32:33 PM »

how will your robot react with the temperature sensor?. Will it go towards hot/cold spots.

creedcradle · « **Reply #4 on:** October 20, 2007, 05:08:03 PM »

@paulstreats

my bot should move away from hot spots. of course, the wheels will melt if the bot would go into the hot spot..

im still trying to evaluate the melting point of the materials that i will be using..

creedcradle · « **Reply #5 on:** October 21, 2007, 03:33:11 AM »

Here is the dimensions of the bot

I guess the file is really big and the dimensions arent visible. need to download to view the dimensions

http://i205.photobucket.com/albums/bb200/nauuhaw/CADbot.jpg

Admin · « **Reply #6 on:** October 21, 2007, 09:34:46 AM »

just an FYI, images can be uploaded to this forum (if you ever want to bypass photobucket)

creedcradle · « **Reply #7 on:** October 28, 2007, 01:56:32 AM »

here is the final CAD of the bot

Admin
dunk
jonhylands
h3ro

and all others in SoR who knows what i don't know.. i need help..

Questions:
1. how can i build a temperature sensor that will be able to measure temp greater than 3 meters from the robot. as much as possible i don't want to use a module or anything .. i want it to be totally home built from basic discrete materials and ICs.

2. if #1 is satisfied. how i will i know which direction is that source of the temperature reading. say, how would i know if the temperature reading is the one in front of the bot ?

Thank you in advance.

-creedcradle

Ro-Bot-X · « **Reply #8 on:** October 28, 2007, 06:05:19 AM »

You should take a look at Sandwich robot. It uses a comparator, not a microcontroller. Instead of using the sensors for line following, use apropriate (I don't know exactly which kind) temperature sensors to stay away from heat sources. Try a couple of PIR sensors or UV sensors.

Steve Joblin · « **Reply #9 on:** October 28, 2007, 08:27:21 AM »

what is the yellow ball for in the CAD of your bot?

I think you may need to build some type of articulated extendible arm that has a temperature sensor at the end... I don't know of any sensor that can look 3 meters in front of itself to determine the temperature.

Admin · « **Reply #10 on:** October 28, 2007, 10:11:27 AM »

Hmmmm well your sensor needs to be IR. Infrared light is emitted from warm objects - the more emitted, the hotter it is. There are handheld devices that you can buy - point and shoot - that give you a temperature readout from a few feet/meters away.

But I havent a clue on how to make it from scratch . . . I would do a search on IR sensor IC's from various electronics distributors and see what you come up with . . .

You will definitely have to do a lot of amplification and calibration to get it to work . . .

creedcradle · « **Reply #11 on:** October 28, 2007, 08:31:38 PM »

Guys.. thank you so much for your replies.. i appreciate it

Quote from: Steve Joblin on October 28, 2007, 08:27:21 AM

what is the yellow ball for in the CAD of your bot?

Ball-type camera.

Quote from: Steve Joblin on October 28, 2007, 08:27:21 AM

I think you may need to build some type of articulated extendible arm that has a temperature sensor at the end... I don't know of any sensor that can look 3 meters in front of itself to determine the temperature.

I was thinking this before, but the arm has to have a high melting point.. that is why i dont like it.

creedcradle · « **Reply #12 on:** October 28, 2007, 08:57:59 PM »

thanks Ro-Bot-X , i will try to see that page

@Admin

I will be waiting for that.

.. well, i will also do some further research on this..
Amplication isnt really a big problem for me.. as long as i have ways to do it..

creedcradle · « **Reply #13 on:** October 31, 2007, 03:04:17 AM »

WHOAAAA!!!!

i found the keyword of what iam looking for.. but the price isnt reasonable for the said "non-contact temperature sensors"

anybody knows a cheap non-contact temp sensor?

Steve Joblin · « **Reply #14 on:** October 31, 2007, 06:03:05 AM »

You mean a thermistor? they are less than a $1 at Jameco... http://www.jameco.com/webapp/wcs/stores/servlet/KeywordSearchResultView?langId=-1&storeId=10001&catalogId=10001&searchType=k&searchValue=thermistor&categoryId=107039&rscount=26

Tsukubadaisei · « **Reply #15 on:** October 31, 2007, 10:28:44 PM »

What are those wheels? Are you going to use a steering mechanism? If not you will face problems when turning your robot.

frank26080115 · « **Reply #16 on:** October 31, 2007, 11:35:08 PM »

Quote from: Steve Joblin on October 31, 2007, 06:03:05 AM

You mean a thermistor? they are less than a $1 at Jameco... http://www.jameco.com/webapp/wcs/stores/servlet/KeywordSearchResultView?langId=-1&storeId=10001&catalogId=10001&searchType=k&searchValue=thermistor&categoryId=107039&rscount=26

Aren't those supposed to be used very close to what you want to measure? I just don't see them working at long ranges.
I'd personally experiment with a IR phototransistor in a tube with a lens that filters visible light, but it might need to be amplified quite a bit.

Quote from: Tsukubadaisei on October 31, 2007, 10:28:44 PM

What are those wheels? Are you going to use a steering mechanism? If not you will face problems when turning your robot.

Na, he won't, differential drive systems work wonders

creedcradle · « **Reply #17 on:** November 01, 2007, 03:52:49 AM »

@Steve Joblin
im not looking for the basic thermistor, we all know that it cant detect temperatures greater than 3 meters..

@Tsukubadaisei
definitely no steering here.. i need the bot to do turns at minimum ... it can only be done by differential drive ....
I will buy this robot http://e-gizmo.com/KIT/Mobot.HTM and take out the wheels of it..

@frank26080115
differential. absolutely right. tell me 'bout your experiment on IR, oopppsss i would not ask the schematics or anything, all i need to know is the general overview like how many stages of amplifier i should possibly use that runs at minimum power consumption... thanks in advance

guys , again . NO ROOM for microcontroller on this robot.

Admin · « **Reply #18 on:** November 01, 2007, 06:41:49 AM »

Quote

guys , again . NO ROOM for microcontroller on this robot.

but your CAD has room?

you probably considered this but just in case . . . consider getting an IR camera with visible light filters on it . . . and use basic computer vision to interpret colors as temperatures . . .

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Author Topic: CAD of new Robot (need help) (Read 5875 times)

paulstreats