The V0 (also labelled as VEE) connection is for contrast control, and a potentiometer (10K) is usually attached to this terminal. Normally, the R/W terminal is tied to ground. For backlighting purpsoe ...

• Potentiometer ($1) • LCD display ($10) ... (temperature sensor) and connecting them to a programmed Arduino gave me a gadget that monitors the environment of a single plant.

We set the potentiometer pin as 0 (A0 on the Arduino Uno board), the CONTROL variable is the voltage that is used to cotrol the led brightness of the speed of the fan. In the setup() function the ...