HopeRF HM-BT4502 Bluetooth Low Energy 5.0 Module

The module communicates via a standard UART serial interface. Connect the module's TX and RX pins to your MCU's corresponding RX and TX pins, ensuring a common ground. Power the module with a supply between 1.8V and 3.6V. You can then send and receive data or AT commands at a configured baud rate, with 9600 bps being the minimum supported. No Bluetooth stack knowledge is required on the host MCU, as the module handles all BLE protocol layers internally.

The module supports a set of AT commands for basic control and configuration. Key commands include AT+RESET for a software reboot, AT+MAC to retrieve the module's Bluetooth MAC address, and AT+CONINT to adjust the Bluetooth connection interval for optimizing power consumption or data throughput. You can also use commands to control the data forwarding rate, enabling dynamic power adjustment based on your application's required update frequency.

The achievable range depends on the selected transmit power, antenna environment, and local RF interference. With its maximum output power of +8dBm and a receiver sensitivity of -97dBm, you can expect a reliable range of several tens of meters in open space. To maximize range, ensure a stable 3.3V power supply, use the AT command to set the transmit power to +8dBm, and position the module's integrated antenna away from metal enclosures or other sources of signal absorption or reflection.