Rejeee now has a LoRaWAN-Enabled Waterproof Road Temperature Sensor

With IoT’s increasing prevalence, sensors play a vital role, and temperature sensors are some of the most commonly used. The Rejeee Temperature Sensor is one example of these devices. It is a 3-way DS18B20 waterproof temperature sensor embedded with LoRaWAN making connectivity more robust.

The Rejeee Temperature Sensor uses a Cortex-M processor and runs on replaceable Lithium AA batteries (ER145052), drawing a peak current of 120 mA and a standby current of just 12 μA. These specs are relevant since this setup allows it to last up to 5 years with 10-minute reporting intervals. Furthermore, the sensor has an operating temperature range, from -40°C to 85°C, and can measure temperatures between -40°C and 125°C. It can withstand humidity up to 95% RH.

The DHT22 measures temperature and humidity but isn’t very durable and lacks waterproofing. In contrast, the Rejeee sensor is more rugged and waterproof, making it a better choice for use in extreme conditions.

It is useful for:

• Cold storage facilities: Ensures the protection of sensitive goods by monitoring sub-zero temperatures.
• Greenhouses: Helps maintain the right temperature for plant growth.
• Data centers: Monitors rack-level temperatures to prevent equipment overheating.
• Buildings: Manages indoor climates for comfort and energy efficiency.

Rejeee’s Temperature Sensor uses LoRaWAN for wireless communication as mentioned earlier. This technology allows the sensor to send data over long distances with minimal power, making it ideal for remote areas. Unlike the DS18B20, which needs a wired connection and extra components for remote use, Rejeee’s sensor connects easily over large areas without the need for extensive infrastructure due to its LoRaWAN compatibility. This makes it a better choice for large or remote IoT projects.

The sensor transmits data wirelessly at speeds from 300 bps to 62.5 kbps. It has a maximum transmit power of 22dBm and a receiver sensitivity of -140 dBm. It supports frequency ranges from 433-510 MHz and 863-928 MHz. The device is compact, measuring 103 mm in length, 60 mm in width, and 27 mm in height.

Features:

• Signal indicator light: Red LED for indicating Power; Green LED for indicating data transmission
• Left on/off Button
• Right data button
• Battery Compartment

The Rejeee temperature sensor, designed for waterproof and long-range communication, is available for purchase through RAK Wireless.

The datasheet provides detailed information about the device’s specifications and usage. The user manual, page 8, details the device configuration and Network Server Configuration.

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