Seeed Studio Studio Grove LoRa Radio 433MHz Module

Connect the module to your Arduino via a Grove base shield using the supplied 4-pin cable. Utilize a LoRa library such as Sandeep Mistry's Arduino-LoRa. In your sketch, initialize the serial UART interface, set the frequency to 433E6, and define the CS, RST, and DIO0 pins according to the module's pinout. You can then use standard library functions like LoRa.beginPacket(), LoRa.write(), and LoRa.endPacket() to transmit data. Ensure your power supply provides a stable 3.3V or 5V as required.

Yes, the module includes an MHF (also known as IPEX) connector next to the onboard wire antenna. You can attach a compatible 433MHz antenna with an MHF male plug. For optimal performance, select an antenna with appropriate gain (e.g., 3dBi or 5dBi) and an impedance of 50 ohms. Ensure the antenna is positioned vertically and away from large metal objects or enclosures to prevent signal shielding. The external antenna will typically provide better range and signal stability than the integrated wire.

The module draws approximately 28mA average during continuous transmission at +20dBm, about 20mA in active receive mode, and around 8.4mA in standby. To minimize power for battery-operated nodes, you can leverage the LoRa modem's built-in sleep modes via library commands. After sending or receiving data, put the radio into sleep mode using LoRa.sleep(). You can also completely power down the module through a GPIO-controlled MOSFET if your host board supports it. Always measure current in your specific application, as duty cycle dramatically impacts average consumption.