He’s doing this with a bathroom scale underneath the coffee machine connected to an Arduino Ethernet module. By measuring the weight of the coffee pot and subtracting the known empty weight ...

think temperature sensors and potentiometers. Outputs, on the other hand, are components that receive data from the Arduino. This includes LEDs, LCD modules, servo motors, and buzzers. When ...

so [Brett] decided to use an Arduino instead. The welders control circuit runs at 24V, so an optoisolator receives the trigger signal, and relays are used for outputs. Potentiometers were added to ...