The use of Bluetooth module in STM32 embedded development
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Bluetooth integration enables STM32 microcontrollers to communicate wirelessly with smartphones, PCs, and other devices. Here's a comprehensive guide to implementing Bluetooth in STM32 projects. 1. Bluetooth Module Options for STM32 Popular Bluetooth Modules Module Type Interface Key Features HC-05/HC-06 Classic Bluetooth (2.0) UART Easy AT commands, widely used BLE (CC2541, nRF51822) BLE 4.0/5.0 UART/SPI Low-power, IoT-friendly ESP32 (Built-in BLE) Dual-mode (BT + BLE) UART/SPI Wi-Fi + BLE combo RN4870/RN4871 BLE UART Pre-programmed GATT profiles 2. Hardware Connections Wiring HC-05 to STM32 (UART) HC-05 Pin STM32 Pin Notes VCC 3.3V/5V Check module voltage GND GND Common ground TX USART_RX (e.g., PA3) MCU receives data RX USART_TX (e.g., PA2) MCU sends data (3.3V logic!) STATE - Optional (indicates connection) ⚠️ Note: Use a logic level converter if the module is 5V and STM32 is 3.3V. Some modules (like RN4871) require a wake-up pin (HCI_WAKE) . 3. Soft...