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 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
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.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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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.