The EnOcean ISM-band transmitter module STM 300 enables the realization of wireless and maintenance free sensors and actuators such as room operating panels, motion sensors or valve actuators for heating control.
The 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 connected externally to bridge periods with no supply 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 100sec). 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 sensitivities can be selected). In the 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.

Operating Frequency: 868.3MHz (STM 300 RS 786-3192)
Data Rate: 125kbps
Modulation: ASK
Integrated 16MHz 8051 microcontroller with 32KB Flash memory and 2KB SRAM
3 x A/D converter inputs
4 x digital inputs
Configurable wake-up and transmission cycle
Wake-up via Wake pins
Voltage limiter for harvested power supply
Threshold detector
Features accessible via API:
- Receiver functionality
- Various power down and sleep modes down to 0.2uA current consumption
- Up to 16 x configurable GPIO
- 10-bit ADC, 8-bit DAC
Operating temperature range: -25 to +85°C
Applications: Wireless, battery-less sensor communication for the Internet of Things (IoT)

Batteryless Wireless Applications

EnOcean manufacture a range of transmitter and receiver products that operate in the 868MHz area of the ISM band. These devices are typically very efficient in terms of the power supply requirements and are used to send short messages.,The advantages of EnOcean technology are clearly illustrated through applications such as electrical control which eliminates the need for external wired connections and batteries.,Suitable for limitless applications where maintenance free and flexible switching needs to be installed without drilling, cabling and reconstruction costs.,Power in the transmitters is also created for "FREE" using energy harvesting techniques to create energy from the push button switches or solar power for its sensors transmitters.,Radio systems based around EnOcean technology can be formed into star, mesh, or hybrid topology networks, and are a good complement to ZigBee systems, typically in building automation and remote sensor applications.