$49 Rejeee multiple external temperature sensor for LoRaWAN ships with three DS18B20 temperature sensors

The “Rejeee multiple external temperature sensor for LoRaWAN” is a LoRaWAN solution for temperature sensing that includes three waterproof DS18B20 temperature sensors that could be useful for cold storage, kitchen, and greenhouse monitoring.

The device has a waterproof design that can withstand moisture and wet environments, is equipped with sensors measuring temperature within the -40°C to 125°C range, plus low-power LoRaWAN connectivity and Lithium AA batteries that can last up to five years when sending data every 10 minutes.

Rejeee multiple external temperature sensor for LoRaWAN

Rejeee multiple external temperature sensor for LoRaWAN specifications:

  • Microcontroller – Unnamed Arm Cortex-M MCU; potentially STMicro STM32L151 Cortex M3 @ 32 MHz based on another temperature sensor from Rejeee.
  • LoRaWAN
    • Data Rate – 300 bps ~ 62.5 kbps
    • Transmit Power – 22 dBm Max.
    • Receiver Sensitivity – -140 dBm (BW = 125 kHz, SF12)
    • Operating Frequency – LF: 433 ~ 510 MHz; HF: 863 ~ 928 MHz
    • Bands
      • EU868, IN865, RU864
      • US915, AU915, KR920, AS923
  • Temperature Sensors – 3x DS18B20 with -40°C to 125°C measurement range
  • USB – USB port located inside the battery compartment for modifying parameters and upgrading firmware
  • Misc
    • Power LED (red), data transmission LEDs (green)
    • Power button, data button (to manually send data for testing)
  • Power Supply
    • Replaceable Lithium AA Batteries (ER145052)
    • Battery life of about 5 years with 10-minute reporting @SF9)
  • Power Consumption
    • Peak Current – 120 mA
    • Standby Current – 12 µA
  • Dimensions – 103 x 60 x 27 mm
  • Temperature Range – -40 ~ 85°C; ≤ 95 %RH

Rejeee SensorTool

Configuration and firmware updates can be done through USB using the SensorTool shown above and available for Windows only. RAKWireless also provides additional documentation showing how to interface the multi-temperature sensor device with The Things Networks using a JavaScript payload decoder after connecting the sensor device to a LoRaWAN gateway. You’ll find all documentation such as the datasheet and the user manual on the company’s online store where the device is sold for $49 before applying the referral code XUO54T for an 8% discount.

Multi temperature sensors LoRaWAN The Things Network
Integration with the The Things Networks
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1 Comment
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hrr
hrr
1 month ago

Since a large temperature range is combined with a waterproof claim I wonder if some goretex plug was used. Probably (perhaps the mark in the far left corner).
Just airtight is in most cases not enough in a salty and wet sea environment.

Khadas VIM4 SBC