The hardware setup is fairly simple – just connect A4, A5, power, and ground on both Arduinos together ... From there you’ve nearly doubled the number of Arduino pins your project can control.

Any arduino will work, just change which pin is used as the output. Temperature Sensor:I used an LM35 temperature sensor, to detect the water temperature. They have 3 pins (power, ground ...

Following the circuit around from the pin 13 output we find a resistor, followed by an LED, and then a connection to the Arduino ground. When pin 13 is set to HIGH, +5 volts is supplied through ...

Connect your Arduino Your processor needs to share a ground with the negative pins, so wire pins 17 and 19 into the ground connection on the Arduino. Wire pin 18 from the disk drive into pin two ...

Wyatt]’s CPUVolt library provides a fast way to measure voltage using no external components, and no I/O pin. It only applies to certain microcontrollers, but he provides example Arduino code ...

Gurus can easily access this data using the USB port on the board, or they can hook it up to an Arduino ... 16 pins. Out of these, there are four sense pins, six current pins, and six ground ...