This page explains the JEMRF Wireless Temperature Sensor

Product Description

Wireless temperature sensor with accuracy of ~1°C accuracy. 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

  • TMPA99.99 (temperature reading format)
  • TEMP (the TEMP command requests the sensor to transmit a temperature reading)


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

Default configuration

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