Thanks to the magic of electrical properties you can use an LED as a light sensor. It is easy to search and find the details of how and why, so I’m just going to include some code here. Ok, ok… If you plug the LED into one of the Arduino digital pins backwards (i.e. Cathode…
This is just a small snippet of code for using a digital pin on the Arduino to capture capacitance. To test it I just stuck a paperclip into pin 8. Works great! void setup() { Serial.begin(9600); // connect to the serial port } void loop () { char capval; char pinval = 1<<PINB0; //digital pin 8…
