STX882 + SRX882 433MHz ASK Transmitter & Superheterodyne Receiver Module Kit w/ Antennas

Connect the DATA pin of the STX882 to a digital output pin on the Arduino. For the SRX882 receiver, connect its DATA pin to a digital input pin. Ensure both modules share a common ground with the Arduino. Use the Arduino's digitalWrite() function to send high/low pulses representing your data. The receiver's output will be a reconstructed digital signal. Remember to attach the provided 433MHz antenna to the ANT pad on each module for optimal range. Power the modules within their 2.4V to 5.5V operating range, which can be supplied directly from the Arduino's 5V or 3.3V pin.

The operational range depends on output power, antenna placement, and environment. At the maximum 20dBm (100mW) transmit power with the included antennas in an open field, you can expect up to 100 meters. In urban or indoor environments with obstacles, the range will be reduced. Using a higher-gain external antenna properly matched to 433MHz can significantly extend the range. The high receiver sensitivity of -110dBm helps maintain a reliable link at the edge of the transmission distance. Always comply with local regulations regarding maximum transmit power for the 433MHz ISM band.

The STX882 enters its ultra-low sleep state (less than 1µA) when the DATA input pin is held at a logic low level. In your firmware, set the controlling GPIO pin to OUTPUT and LOW when the module is not actively transmitting. To wake it and begin transmission, simply set the DATA pin high and modulate it with your data stream. This sleep mode is managed entirely through the digital signal, requiring no special AT commands. This feature is crucial for battery-powered projects, allowing you to minimize average current draw by keeping the transmitter asleep except during brief data bursts.

Yes, both the STX882 transmitter and SRX882 receiver are designed to operate across a frequency range of 315MHz to 433.92MHz. The modules are typically tuned at the factory for one of these center frequencies. The kit described is configured for 433MHz, as indicated by the included SW433-TH22 antennas. If you require 315MHz operation, you would need to source modules specifically tuned to that frequency and use antennas like the SW315-TH23 mentioned in the description. The receiver's performance parameters, such as latency (20ms @315MHz) and current consumption (2.5mA), differ slightly between the two frequency bands.