Chillout Zone
Let's Make Robots!
Home

Transistor based line follower

, , , , , , ,
Robot
 
djhesit8's picture
By djhesit8
@ May 1, 2010
follows a black line on a white surface
Cost to build: 
$40
Time to build: 
10 hours
URL to more information: 
http://www.ermicro.com/blog/?p=1097
Weight: 
500 grams

 

Hi guys....

 

 

Finally today arrived the last order for this robot... the wheels and the caster....

 

I took me 2 night of CAD-ing...

 

This is  my first entry and I hope that you'll like this... I made this robot based on ermicro schematic and tutorial...  http://www.ermicro.com/blog/?p=1097

 

I used near the same things excepting the transistor... I'm using two 2N2222 transistor which allows 800mA on its collector... So the basic ideea is to follow a black line on a white surface... The principle of working is simple... I used a white LED to illuminate the surface... and one LDR as reciever/sensor.... when the white light contacts a white surface it will be reflected so the LDR lower his voltage opening the transistor... as the transistor is opening, the gearmotor gets more curent and will spin faster making it to turn...

 

 

UPDATE:

 

unfortunatly I get tired with setting the trimpots every time when the illuminance changed... this way I was going to use QRD1114 fairchild sensor... and finally it's working... no more white light... :D just IR...

 

the only problem is that when my trimpots are at 0 Ohm, my LED isn't glowing :( the blue flashing LED :(

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
By Towlieboy78
@ Wed, 2010-06-30 23:56
Towlieboy78's picture

Are the blue rectangle like things terminal blocks?

 

By djhesit8
@ Thu, 2010-07-01 00:22
djhesit8's picture

yes they are

By Towlieboy78
@ Tue, 2010-06-29 22:48
Towlieboy78's picture

If I am using 4 or more sensors could I use the faster GM8 motor instead of the GM2?

By djhesit8
@ Wed, 2010-06-30 00:17
djhesit8's picture

give it a try :D if you don't try you never know btw thoreticaly it should work, but in practice?

By Korel
@ Wed, 2010-06-23 03:55
Korel's picture

Hi!  Thanks a lot for your cheap project which is great and simple. I also have a tank and will use this circuit.

Keep posting new ideas for us my friend and I like your design too. :D

By djhesit8
@ Wed, 2010-06-23 08:50
djhesit8's picture

thanky you for your comment :D

By Sergey_M
@ Sun, 2010-06-20 10:53
Sergey_M's picture

Cool design)

-------------------

tell me what program did 3d model?

By djhesit8
@ Sun, 2010-06-20 23:02
djhesit8's picture

that is Autodesk Inventor...

By Towlieboy78
@ Fri, 2010-06-18 18:38
Towlieboy78's picture

Since you helped I shall help you. Here are the directions to the simple line following switch to make the robot follow dark and light lines. Hope this helps :D

Link: http://letsmakerobots.com/node/20968

By djhesit8
@ Fri, 2010-06-18 20:42
djhesit8's picture

request not found... but... aplying a resistance to base will make it work :D no problem :D

12345next ›last »