Generic 42 Multi-Function 2.4GHz RF Wireless Module - Transmitter test panels

The module supports two main modes: serial data transparency, where it acts as a wireless UART bridge passing data between two serial ports, and direct switch control, where it interprets specific RF packets to toggle digital output pins. You configure the mode via command frames sent over its serial interface, typically at a default baud rate like 9600 or 115200 bps, depending on the firmware version.

Power the module with a DC supply between 1.8V and 3.6V, connecting to the VCC and GND pins. During active transmission at +5dBm, current draw will peak. However, its key feature is an ultra-low idle current of 20µA when the RF transceiver is in sleep mode, which is crucial for extending battery life in remote sensors or controls. Ensure your power source can handle brief transmit current spikes.

No, this module uses an integrated -3dBi gain PCB trace antenna soldered directly onto the board and is not designed for an external antenna connector like IPEX or SMA. The antenna pattern is omnidirectional. For optimal range, orient the module vertically and avoid placing metal objects or noisy power supplies directly next to the antenna section on the PCB to prevent signal degradation.

Communication is managed via AT-style or proprietary binary commands sent over its UART (TX/RX) interface. You need a microcontroller (e.g., Arduino, STM32) to generate these command frames for pairing, setting channels, or sending data. The module handles the 2.4GHz packetization. There is no built-in LoRaWAN or BLE stack; it uses a simple proprietary RF protocol, so you need matching transmitter/receiver pairs.

The specified 100-meter range is for open line-of-sight conditions. Real-world range through walls is significantly less. To maximize range, ensure clear paths, orient modules for best antenna polarization, and avoid 2.4GHz interference from Wi-Fi routers. Operating at the maximum +5dBm transmit power and ensuring a stable 3.3V supply also helps. For longer distances, consider a system with a higher-gain external antenna, which this module does not support.