This is a proof of concept for controlling an LCD dot matrix with an Arduino. The screen displays a spinning line. The wiring is quite neat and the code, when properly abstracted, will be easy to work with.
- 128 x 64 LCD dot matrix display, with ST7920 chipset
- Arduino board (Arduino Uno and Wemos D1 Mini were tested and are provided as examples)
Any 128 x 64 LCD that uses the ST7920 chipset should work interchangably with this code, and similar chipsets may work equally well if the constructor is modified accordingly.
The wiring of the numerical pins (E, R/W, RS, RST) can be connected to whichever GPIO pins you wish - just change the pin definitions to match your setup. The ones provided here are (tested and recommended) examples. Obviously, the LCD pins that go to +5V/GND must go to those places.
| LCD | Uno | D1 Mini |
|---|---|---|
1 GND |
GND |
GND |
2 VCC |
+5V |
+5V |
4 RS |
10 |
0 (labelled D3) |
5 R/W |
11 |
4 (labelled D2) |
6 E |
13 |
5 (labelled D1) |
15 PSB |
GND |
GND |
17 RST |
8 |
2 (labelled D4) |
19 BLA |
+5V |
+5V |
20 BLK |
GND |
GND |
This code uses the u8g2 library. This needs to be installed for the code to run. To install it, open the Arduino IDE, and navigate to Sketch > Include Library > Manage Libraries..., then search for "u8g2" and install it.
These pages from the u8g2 documentation will likely be useful to varying degrees:
- Replace absolute coordinates with values relative to screen size
