Firmware Internals

Code Structure

hx711

This module implements load cell support. It is an async version of the loadcell crate with project-specific changes.

ble

This module implements the Bluetooth Low Energy (BLE) functionality:

• Defines the GATT server and services
• Handles advertising and connections
• Defines the Progressor service with data point and control point characteristics

progressor

The progressor module implements the Tindeq API used for BLE communication between the ESP32-C3 and a smartphone.

Main Tasks

The main.rs file defines several asynchronous tasks that run concurrently:

• measurement_task:
  • Initializes the load cell.
  • Handles taring and reads measurements from the sensor.
• ble_task:
  • Long-running background task required alongside other BLE tasks.
• gatt_events_task:
  • Processes GATT events such as control-point writes.
• data_processing_task:
  • Handles sending notifications with data points.
• battery_voltage_task:
  • Periodically reads the battery voltage.
• deep_sleep_task:
  • Monitors inactivity; after a timeout, the device enters deep sleep.

Communication between tasks occurs via a Channel.