Generic 2.4GHz RF Switching Module w/ PCB Antenna

The module features built-in ID learning. Typically, you place both the transmitter and receiver modules into a learning mode via a specific pin sequence or button press. They will then exchange and store a unique ID code, ensuring paired communication. This process eliminates interference from other 2.4GHz devices and does not require any external microcontroller programming for basic switching functions.

This module uses a simple UART serial interface (TX/RX) for sending and receiving control commands. The default baud rate is commonly 9600 bps, but it may be configurable via AT commands sent to the module. You connect these pins directly to a host MCU's serial port or use it standalone for direct switching via its built-in logic, which interprets serial data packets as on/off commands for its output pins.

No, this specific variant is designed with a fixed, integrated PCB antenna rated at -3 dBi gain. The RF circuitry is matched to this onboard antenna, and there is no standard connector like IPEX or SMA for attaching an external antenna. For increased range, you would need to select a different 2.4GHz module model that includes an external antenna port and ensure proper 50-ohm impedance matching.

According to specifications, the idle current is 20 µA. During active reception, the current draw will be higher, typically in the range of 20-30 mA. When transmitting at its maximum +20 dBm output power, the current consumption can reach 100-150 mA. The module supports low-power sleep modes to conserve energy in battery-operated remote sensors, waking only to transmit or receive brief data packets.

For a basic light switch, connect the module's VCC and GND to a 3.3V power supply. The output control pins can be connected to a relay module's signal input. Pair your remote transmitter with the receiver module using its learning function. When the remote button is pressed, the receiver's output pin will toggle, triggering the relay to switch the light. No coding is required for this basic on/off functionality.