PIC24FJ128 and Display LCD

The circuit is very easy, especially for the beginners. The function of the display is to convert the binary format into ASCII characters. The series of LEDs on the left represents the binary output before being into the LCD, and are driven by the microcontroller via the PORTBs.

The entire routine is in assembly and you can download it here

Controller LCD pinout

The 32×2 display has the pinout as described below:

1. VSS: Also known as GND (ground), it is the ground connection of the LCD module
2. VDD: Also known as VCC it is the power supply positive terminal of the module
3. V0: Also known as VEE, this pin is used to control the contrast of the display, it is usually connected to a potentiometer or variable resistor output
4. RS (Register Select): Selects whether data is being sent to the display as a command (instruction) or a display data. A logic low for command and logic high for display data
5. R/W (Read/Write): This pin selects whether data is being read from the display or written to it. Logic high for Read operation and logic low for Write operation. If just write operations are required then this pin could be connected directly to GND
6. E (Enable): A pulse input to the enable pin triggers the Read/Write operation of the display whatever it is a command or display data
7. 7 -10. DB0 to DB3: Four low-order bidirectional data pins are used for data transfer between the microcontroller and the LCD. These pins are used only in 8-bit operation and they are not used in 4-bit mode.
8. 11-14. DB4 to DB7: Four high-order bidirectional data pins, used for data transfer between the microcontroller and the LCD
9. 15. A (Anode): This pin is the anode terminal of the backlight LED
10. 16. K (Cathode): This is the cathode terminal pin of the backlight LED