Hello everyone,
Today I’m bringing you all a project I had to do in the second semester of 10th grade in my technology class.
The idea was to develop a robot able to follow a black line in a white background. I developed a circuit which used two optocouplers which were situated at both sides of the line, so if the line turned, one of the optocouplers would receive black instead of white, stopping the electric engine to which it was associated.
So the general circuit was made out of two almost identical circuits, one for each pair of optocoupler-e.engine. In each of these cirucits, the optocoupler is connected to a potentiometer and a LED (just to visualize which engine is working at every moment) and a geared motor. In the back of the robot a idler wheel is used to enable it to turn. All the circuit works in 4.5 Volts.
You can see a schematic of the circuit here, and the Bill of Material here.
I also leave you some pics and videos to show all the mechanism more clearly :).
The Robot Foundation 