Wireless Magnetic Contact Sensor Switch

The Magnetic Contact Sensor can be used for monitoring doors and windows. It is small (1” x 1” or 2.54cm x 2.54cm) and can be installed discretely. Battery life is around 1 year, depending on the number of transmissions. A rugged but elegant cream plastic case allows the sensor to be deployed both indoors and outdoors and if sealed with silicone could be water-resistant. The sensor is activated by a change in the external switch (i.e. open or close), sending a transmission to the base.

While the battery allows for a more discreet sensor, the use of an external power source allows the contact sensor to operate in request/reply or publish mode. In request/reply mode, the device can operate fully "awake" and respond to requests to the current switch state. The device will also transmit switch state changes when in fully awake mode.

Optimize battery life

Tested at 288 (144 door open/door close) messages per day for 1 year on one battery.  

If you are using this sensor for doors and windows that are normally closed, use a Normally Closed switch. The switch is closed when in contact with Magnet.

If you are using the sensor with a door or window that is normally open, use a Normally Open switch. The switch is open when in contact with the Magnet.

Tutorials: 

• Monitoring solutions
• Wireless switch tutorial
• Test switch sensor
• PrivateEyePi Alarm System
• JemRF Documentation

Technical Specs:

• All devices are based on the high-performance RF transceiver based on the market-leading CC1100 SOC.
• Wide operating voltage range of 2-3.6V makes the devices suited for battery power.
• Current consumption: RX: 16.2 mA , TX: 15.2 mA. Deep Sleep : 0.005Ma (0.5 µA).
• Up to 1KM line of sight. Short-range (30M) penetration of walls and floors.
• 128-bit AES encryption security.
• Driver-less installation.
• All the devices are highly configurable through the serial port or over the air using the LLAP messaging protocol specified in the manual. 
• Base station communicates through the serial port (TTL UART)).
• Communicates in ASCII clear text, making it very easy to exchange data between devices over the air.
• Supports point-to-point, point-to-multi-point, multi-point to point and multi-point to-multi-point.
• A virtually unlimited amount of devices can be deployed. 99,999 Personal Area Network ID’s, 10 channels per frequency and 7,744 Device ID’s per network.
• Super low power consumption allows devices to be used with a coin cell battery for long periods of time (up to 1 year depending on transmission rates).
• Supports 6 frequencies (433 MHZ, 915 MHZ (default US & Canada), 868.3 MHZ (default Europe), 868 MHZ, 903 MHZ, 315 MHZ)
• 10 channels per frequency.
• 4 pins for communicating with external micro-controllers like Raspberry Pi and Arduino : Tx, Rx, GND, 3V3.
• Battery monitor to keep track of power consumption.