Hardware Monitor for round 1.28" display

These are available on Aliexpress as "smartwatches". Based on ESP32-C3-MINI and a GC9A01 display controller. (By the way, at least my device has quite weak WiFi)

Requirements

• ESP-IDF 5.0

3rd party components

• LVGL ESP32 drivers (slightly modified): https://github.com/lvgl/lvgl_esp32_drivers (MIT license)
• WiFi Manager is from: https://github.com/huardti/esp32-wifi-manager (MIT license)
• Font from: https://fonts.google.com/specimen/Poppins (Open Font License)

Building and using

First, install LibreHardwareMonitor on your PC and make sure you either have a static IP or a stable local hostname that resolves correctly.

Simply run idf.py menuconfig and set the LibreHardwareMonitor URL (for example the PC has IP 192.168.1.123) to: http://192.168.1.123:8085/Sensor?action=Get&id=

Customize the sensors and labels in sensors.c. You can find the sensor paths by accessing LibreHardwareMonitor's data.json (eg. http://192.168.1.123:8085/data.json).

Now you can idf.py build and idf.py -p com[n] flash (keep BOOT button pressed and press RST to go into boot mode, then RST after flash is complete). The device should initially come up with an access point (SSID CircleMonitor and password 12345678), connect to that and connect to your WiFi.

If all goes well, the sensor data should soon start scrolling on the display.

Clearing NVS

Press BOOT button after releasing RST.

Changing font

Font was converted from TTF to LVGL format using lv_font_conv :

lv_font_conv \
  --font /usr/share/fonts/truetype/Poppins-Medium.ttf \
  -r 0x20-0xFF \
  --size 20 \
  --format lvgl \
  --bpp 1 \
  -o CircleMonitor/main/poppins_medium_20.h