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The software consists of several C files. This allows us to have a 1 millisecond pause in our program. We will not use DB0 to DB3, so these will be left unconnected. Write mode is when we write to the LCD so that we can display a message on it. These are what all the pins are: So now you have a good rundown of what each pin of the HD is and does. This type of circuit will form a base for all future projects involving LCDs.

This code allows us to use the pause function in our main. It is a falling edge-triggered clock, which means it executes instructions on the falling edge of a clock signal. Contrast adjustment pin- This pin is used to change the contrast settings of the LCD to make it lighter or darker so that it can be more visible.


The only header file that was used is lcd.

The operating voltage for LED backlights are 5V for full brightness. The contrast adjustment pin, Pin 3, of the LCD connects to ground.

RS Components Statement of conformity. You can change your cookie settings by reading our cookie policy. Vss of PIC16F connects to ground. To do this, we must set the internal timer, timer 0, of the PIC16F chip correctly to produce a 1ms delay.

Microchip PIC16F690-I/P, 8bit PIC Microcontroller, 20MHz, 256 B, 4096 x 14 words Flash, 20-Pin PDIP

Ground- This makes the ground connection for the power of the LCD. If we wanted to provide contrast, we could connect to a potentiometer, but for this circuit’s sake, we will simply hook it up to ground.

It uses it in 4 bit mode. We will not connect the backlights of the LCD in this circuit. Contrast is usually not a problem. Register Select RS pin- The register select pin determines whether the HD will be in command mode also called instruction mode or data mode also called character mode.

Devices with Baseline, Mid-Range or Enhanced Mid-Range architecture are available with numerous different peripheral combinations, giving designers flexibility Vdd is pin 2 and Vss is pin 1.

PIC16F – Microcontrollers and Processors – Microcontrollers and Processors

They are auxiliary pages. When in instruction mode, the LCD will interpret the binary given it as instructions such as “clear the display” or “move the cursor”. Either a 2 row by 16 column LCD can be used or a 20×4. But there are other instructions in the delay loop so using the MPLAB stopwatch, we find that we need Timer0 to overflow at clock ticks. This results in a 1.


Microcontroller Features 20 MHz Max. We always want it in write mode for this circuit, because we will only write characters to the LCD. The data lines simply connect from microcontroller to LCD through jumper wires, with no resistors necessary. Ground serves as the return path for current for a device. This means we only use pins DB4-DB7 as the data lines. The HD is a device that runs on a clock.

It shouldn’t provide any issues with seeing the screen. This makes the internal instruction clock 1MHz, which is 1 microsecond per clock pulse. This makes for less connections and makes the circuit easier to hook up.

This pin must receive voltage in order to work. The product detailed below complies with the specifications published by RS Components. For the LCD to power on, it is the same concept.