Lcd Pin Diagram. The r w pin is connected to ground this will pull the pin low and set the lcd to write mode. We will be using the lcd in 4 bit mode this means you don t need to connect anything to d0 d3.
An lcd is an electronic display module that uses liquid crystal to produce a visible image. Instead of the potentiometer you can use a 1k resistor and connect pin 3 of lcd to vcc via the resistor. Make connections as per the schematic.
Toggles between command data register.
Pin3 is used for controlling the brightness of the lcd. Some of them are data pins and some are command pin. This is a gnd pin of display used to connect the gnd terminal of the microcontroller unit or power source. These lcd s can also operate on 4 bit mode in such case data pin 4 5 6 and 7 will be left free.
