Trace - E
@ October 3, 2010
Follows lights
Cost to build:
$35
Time to build:
5 hours
- Actuators / output devices: 2x Solarbotics GM9
- Control method: autonomous
- Power source: 6V
- Sensors / input devices: 2 x CDS Photocells
- Target environment: indoor
So after lots of hard-work, frustation, time, spending money on wrong parts; I built a robot. Its a Photovore based on NPN transistors. when its LDRs are pointed towards the floor, it becomes a line follower.
i used the following parts-
1.) 2 X 2N3904 NPN transistors
2.) 2 X Solarbotics GM9s
3.) 2 X Cds LDRs
3.) 2 X Wheels
4.) Battery holder
@ Tue, 2012-01-03 12:44
Any updates on the diagram??
Any updates on the diagram?? I am very itnerested on this kind of robots
@ Tue, 2010-10-05 03:20
Hi networkzombie,Your
Hi networkzombie,
Your circuit diagram need to be improved: Missing base resistors for the transistors, bases directly connected to 0V. I am wondering how the transistors shall drive the motors.
@ Tue, 2010-10-05 14:32
LDR = Light Dependant
LDR = Light Dependant Resistor, so that takes care of the base resistors. I agree that the base of the transistors are probably not really connected to ground.
@ Tue, 2010-10-05 14:46
Hi ignoblegnome,No. Please
Hi ignoblegnome,
No. Please measure the resistance of a LDR under bright light. The resistance is nearly zero. This will damage the transistor. Two base resistors with around 2kΩ should be added and the transistors are safe --- even under bright sun light :)
Instead of connecting the bases with 0V (ground), two poti's can be added, then you can also adjust the sensitivity.
@ Tue, 2010-10-05 01:57
Nice robot,I like the
Nice robot,I like the transistors setups. Can you post the schematic please? Thanks and great job.
@ Tue, 2010-10-05 02:08
thanks! yes i will do that
thanks! yes i will do that right now :)
@ Mon, 2010-10-04 02:49
video
i uploaded the video. And no i didnt forget the LMR logo. i will do that as sooon as i get a nice video editing software.
@ Mon, 2010-10-04 07:43
Thanks for the video. It
Thanks for the video. It looks like you have a very effective little light follower. Is the line tracing mode working as well?
@ Tue, 2010-10-05 01:30
I havent tried the line
I havent tried the line tracing mode yet although the motors do slow down when there's a black piece of paper in front of their LDRs and the speed remains the same when the piece of paper is white. I will try that as soon as i think of a modification :)
oh and a quick update - I added a power on indicator circuit.
@ Sun, 2010-10-03 03:23
Looks interesting....now
Looks interesting....now lets see some vid of it moving!