This page explains the JEMRF Wireless Light Sensor

Product Description

The device transmits a value between 0 (dark) and 32,000 (light) and all light levels in between. Very low power and can last up to a year on a single CR2032 coin cell battery when configured to send readings every 10 minutes.


Install battery and close enclosure as described here.

Sensor testing

Product Specifications


  • 2.2-3.3V
  • Powered by CR2032 coin cell battery
  • Can be externally powered by soldering to the 3V3 and GND through holes on the PCB


Messaging details

  • ANAA99.99 (analog reading format)
  • ANAA (the ANAA command requests the sensor to transmit an analog reading)


  • 36mm x 36mm x 15mm case size (1.42” x 1.42” x .59”)

Default configuration

  • Type 5 (Type 5 sensor)
  • NOMSG1 (Sends 1 luminescence reading every cycle)
  • INTVL005 (Sends a reading every 5 minutes)
  • CYCLE (put the device into a timed sleep cycle)
  • Refer device configuration for more details