EnOceanSTM 300 868 MHz ASK Scavenging Transceiver Module

This extremely power saving RF transmitter module STM 300 of EnOcean enables the realization of wireless and maintenance free sensors and actuators such as room operat-ing panels, motion sensors or valve actua-tors for heating control.

Power supply is provided by an external energy harvester, e.g. a small solar cell or a thermal harvester. An energy storage device can be con-nected externally to bridge periods with no sup-ply from the energy harvester. A voltage limiter avoids damaging of the module when the supply from the energy harvester gets too high. The module provides a user configurable cyclic wake up (every 1, 10 or 100 sec.). After wake up a radio telegram (input data, unique 32 bit sensor ID, checksum) will be transmitted in case of a change of any digital input value compared to the last sending or in case of a significant change of measured analogue values (different input sensi-tivities can be selected). In case of no relevant input change a redundant retransmission signal is sent after a user configurable number of wake-ups to announce all current values. In addition a wake up can be triggered externally.