Introduction: PC Hardware Monitor With Arduino and ST7920 LCD
There are 2 versions of the project:
- 4 numeric fieds and 1 graph for CPU load or clock
- 4 independent graphs for CPU temperature, load, clock and used RAM
Parts:
- Arduino Nano or Arduino Pro Mini with USB to serial adapter
- ST7920 128x64 LCD
Supplies
Parts:
Arduino + ST7920
Step 1: Connections
There are only 6 wires necessary to connect Arduino and ST7920 LCD in SPI mode.
Full list of connections from LCD side:
- #01 GND to GND
- #02 VCC to VCC (5V)
- #04 RS to D10/CS or any pin
- #05 R/W to D11/MOSI
- #06 E to D13/SCK
- #15 PSB to GND (for SPI mode)
- #19 BLA to VCC, D9 or any pin via 300ohm resistor
- #20 BLK to GND
To avoid extra GND lines solder 2 wires directly on LCD PCB: GND to PSB to BLK
Step 2: Arduino Firmware
Arduino sketches for both versions of the project:
https://github.com/cbm80amiga/ST7920_HWMonitor
https://github.com/cbm80amiga/ST7920_HWMonitorGrap...
Required libraries:
Step 3: PC Software
- Download and install HardwareSerialMonitor
- Start it with administrator rights
- Choose correct serial port