Custom firmware

PressureMon uses PlatformIO and the Arduino framework. Most users should use one of the supported environments in platformio.ini and edit settings through the web interface. Custom builds are useful when changing hardware, sensor ranges, or integrations.

Configuration values

Build-time defaults and board-specific pin assignments are defined in the firmware source and platformio.ini. Review the target definitions before changing pins: the ESP32-S2, ESP32-S3, and ESP32-C3 boards use different assignments, and only the S3 and C3 targets support Bluetooth Low Energy.

For normal device settings, use the Device and Push configuration pages. See Configuration guide for descriptions of each field and supported options.

Adding hardware

When adding a sensor or changing an existing sensor, check its voltage, interface, I2C address, and pressure range against the board and sensor data sheet. The second pressure sensor is optional and is available on the targets that expose its bus pins. The analog sensor input uses an ADS1115; keep input voltage within the converter’s specified range.

After changing hardware support, update the board documentation and pin table in Hardware as well as the code.

Building and testing

Install PlatformIO, clone the repository with its submodules, and build the target matching the board. The supported target names are listed in platformio.ini. See Development and compiling for the development setup and commands.

For UI work, start the mock server before the Vite development server. This provides the API responses used by the simulator.