Remember you can use only the pins marked with tilda sign (3, 5, 6, 9, 10 and 11) on Arduino UNO board. Also the R value depends on the type of optocoupler that you choose to use. It must be an ...

The photoresistor is based on light resistance, it will sense the light and will allow the microcontroller in this case Arduino to react and change the intensity of Led Diode. The photoresistor ...