DFRobot Self-powered Wireless Switch (433MHz EV1527)

The switch contains a built-in micro-generator based on electromagnetic induction. When you press the button, the kinetic energy from the downward motion is converted into electrical energy. This energy is then rectified and stored by the RF circuit momentarily, providing just enough power to transmit a single 433MHz wireless signal encoded in the EV1527 format, eliminating the need for any battery.

You require a 433MHz RF receiver capable of decoding the EV1527 format at a 10kbps data rate. DFRobot recommends their Gravity: Digital Wireless Switch Receiver (433MHz) for guaranteed compatibility. Other third-party receivers supporting the same EV1527 encoding and decoding rate will also work, but you must ensure they operate on the 433MHz frequency band.

Configure the address using the onboard 4-position DIP switch. The combination of the switch settings selects one of 15 possible states. Additionally, the module uses 1 million sets of random address codes. Ensure the DIP switch pattern on your receiver (if configurable) matches the transmitter's setting for proper communication and to prevent crosstalk with other nearby 433MHz devices.

Do not press the switch more than 4 times per second. Rapid, continuous pressing causes energy to accumulate faster than the RF circuit can consume it for transmission. This energy buildup can lead to over-voltage conditions, potentially burning out the internal chip. Allow a brief pause between presses to ensure safe and reliable operation.

Under ideal indoor test conditions with straightened wire antennas, the transmission range is approximately 40 meters. This range can be affected by walls, furniture, and other RF obstacles. For the receiving module, using an external antenna or the recommended DFRobot Gravity receiver can help maximize the effective operating distance in real-world deployment scenarios.