Imported from GitHub: TanmayChhatbar/cadence_sensor · commit c9ece60 · license GPL-3.0

Description

WIP

README

BREAKING FLAW - The BMW output current is insufficient for the ESP32

(WIP) ESP32 Accelerometer-Based Sensor with Wireless Display Integration

Overview

This project involves the development of a compact, low-power sensor unit using an ESP32 microcontroller integrated with an accelerometer and powered by a 3.7V LiPo cell, which can be charged using solar energy. The sensor unit wirelessly transmits data over BLE. The system is designed for measuring the cadence when riding a bicycle for live telemetry, with low energy consumption and a tiny form factor.

Features

• ESP32-Based Sensor Unit: Equipped with an accelerometer to capture motion data.
• Power Options: 3.7V LiPo.
• Charging Options: USB or Solar
• Wireless Data Transmission: Utilizes Bluetooth Low Energy (BLE) for communication between the sensor unit and the display unit.
• Low Power Consumption: Optimized for energy efficiency, suitable for long-term operation on minimal power. The device will go into sleep mode in case of inactivity.

Components

• ESP32-S3-WROOM-1 Microcontroller: The core of the system, handling both sensor data collection and wireless communication.
• ICM-42670-P Accelerometer: Detects and measures acceleration in three axes.
• BQ25570 BMS: For voltage regulation for the circuit and battery charging.

Setup and Installation

• Hardware Setup

  • Assemble the ESP32 with the accelerometer and choose either the button cell or solar cell for power.
  • Connect to ESP32 with Bluetooth.

• Software Setup

  • Flash the ESP32 with the provided codebase.
  • The sensor unit will continuously monitor the accelerometer data and send it via BLE to the display unit.
  • The display unit will process and visualize the received data.

Usage

• The sensor unit will send data, and the display unit will show the live accelerometer readings.

PCB Design

Below is the image of the PCB design, showcasing the layout of the components for the sensor unit.

Future Improvements

• Integration of additional sensors (e.g., gyroscope).
• Enhanced power management strategies for longer battery life.
• Expansion to support multiple sensor units communicating with a single display.