Let's Make Robots!

lm358

New line sensor

I had some problems with the 36 KHz detector when trying to read it from the picaxe, so I have switched to using 4 infrared photodiodes in a feedback setup with two LM358 dual opamp packages as shown in the following image (for one photodiode only):

linedetector.jpg

This gives an analog reading and I will use this for linear interpolation between the sensors to determine where the line is relative to the robot center.