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Step 2Add the LEDs
In this step, I used two 4000 candela green LEDs in series with weak resistors.
Next to the LEDs I added photoresistors to be used as a color sensor. See the second image for a close-up.
When the green light reflects back at the sensor, more light reflects back from the white line than the background. By using a simple voltage threshold, the sensor picks up more light when its on the line. Therefore it can follow it!
I could have also used infrared LEDs . . . but you can't see it so where's the fun?!
The sensor schematic is the third image.
Next to the LEDs I added photoresistors to be used as a color sensor. See the second image for a close-up.
When the green light reflects back at the sensor, more light reflects back from the white line than the background. By using a simple voltage threshold, the sensor picks up more light when its on the line. Therefore it can follow it!
I could have also used infrared LEDs . . . but you can't see it so where's the fun?!
The sensor schematic is the third image.
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