Making The LCD Expansion Board for PIC18F4520

Posted on Feb 4, 2014

A very useful expansion board for our PIC development board. It will be a Do It Your self (DIY) LCD Expansion board. The expansion board can be plugged into the PIC development board to add 16x2 Alphanumeric LCD Support to it. Since LCDs are required in many projects and experiments it will be a very helpful board. I recommend you to read the LCD Interfacing Tutorial before you proceed.

Making The LCD Expansion Board for PIC18F4520
Click here to download the full size of the above Circuit.

It will give you an Idea how LCD is connected to PIC Microcontrollers. So lets start! The board is very easy to make as the MCU core unit is already done for you. So you need to just care about the LCD part. It consists of the 16x2 LCD Module and A variable resistor (10K) only! Optionally you can add a 47ohm series resistor with the LED backlight of the LCD Module, to enable the backlight. The variable resistor is used to adjust the contrast of the module. If NO text is displayed adjust this pot. As you can see the top row in the board lists all I/O port of PIC MCU like, RB7, RA1 etc. For Example, RB7 stands for Port B 7th bit. The row also has regulated 5v supply and GND outputs. So we start by soldering a 40 PIN Right Angled Burg Housing on the Expansion Board. This will help connect it with the PIC development board. On the expansion board we solder a 16 PIN Burg Housing, this will help attach a LCD Module. Burg Housing is available in 40 PINs, you have to safely cut it using a small hacksaw blade or a sharp hot knife. After that connect each PIN of the LCD with the PIC I/O Ports as shown in the schematic given above. The LCD PIN number and name are printed on the module it self. In the same way we created the LCD Expansion board you can create any other expansion module to hook in your PIC Development board and extend its capabilities. You can remove one expansion board and hook up another to change it to a completely...

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