Turn on Fan when I enter the room!

I wanted to make a simple circuit with a DC motor causing something to move. So the idea of auto-control of lights when people enter a room fascinated me. I tried to emulate this here, with the fan control when an object passes a sensor. The sensor here is a photo-resistor, an analog input to…

Traffic Lights with Photo-Resistor

I have used a Photo Resistor as an analog input with a LEDs as digital output. The first diagram is only with one LED. The second diagram is with LEDs in parallel. I bent the photoresistor so that it can be covered by something moving in front of it, like a car. (I just used the…