DS18B20 LoRaWAN 1-Wire Bridge

LoRa based polling of up to 20 temperature sensors (One-Wire ® Bus)

The Lobaro Onewire over LoRaWAN Bridge

The Lobaro 1-wire ® LoRaWAN Bridge is a low-cost & low-power Lora-based (temperature) sensor to monitor the readings of a wired Onewire buses and transmit them via LoRa or LoRaWAN networks (e.g. TheThingsNetwork) to the Internet at low cost via radio. Here the Lobaro Bridge allows the simultaneous query & power supply of up to 20 sensors installed in parallel (e.g. DS18B20 temperature sensors) on the wired bus.

Our LoRaWAN Bridge allows connections to the Internet with ranges of up to 5 kilometers between transmitter and gateway antenna - without the usual cellular costs in classic machine-to-machine (M2M) applications. Also, unlike mobile radio, own LoRaWAN gateways can easily be installed.

Please also contact us if you require our bridge with mobile radio connection via NB-IoT (Narrowband-IoT) or LTE instead of LoRaWAN. We are happy to carry out such customer-specific adaptations as part of a cost-efficient adaptation.

The configuration is user-friendly via the Lobaro Tool (Windows, Linux, Mac).

DS18B20 LoRa Temperature Sensor

Background Onewire Bus / DS18b20

The One-Wire bus of the company maxim integrated is a serial connection for the realization of wired star-shaped sensor networks. Here, a maximum of three lines (VCC, GND and DQ) are required between the sensors and the querying bus master (such as the Lobaro LoRaWAN Onewire Bridge). The data line is used bidirectionally for both sending and receiving data. Sensor buses built with OneWire can be several hundred meters long and support a large number of sensors or bus devices installed in parallel.

The best known Onewire sensor is the DS18B20 from Maxim Integrated. This is a digital temperature sensor with an accuracy of +- 0.5 °C and a measuring range from -55 °C to 125 °C. Sensors of this type are also available at low cost in robust waterproof metal sleeves (< 5 EUR) are available. With the Lobaro Bridge up to 20 parallel installed temperature sensors can be interrogated time-controlled and the current measured values can be forwarded via radio to the internet for further processing.

Key data / Key facts

  • Radio technology
    LoRaWAN 1.0.1 radio protocol
    On request: NB-IoT/LTE
  • Power supply 
    2x AA batteries (1.5V)
    Generates 3V for sensor supply
  • Compatible OW sensors
    Successful operation tested with:
    a) DS18B20 temperature sensor
    b) DHT22 Humidity sensors
  • Query configuration
    Time-controlled via "CRON job
  • Antenna
    Internal 868 MHz PCB
    Alternatively external antenna possible.
  • Housing
    114.30mm (w) x 59.30mm (l) x 26.80mm (h)
    Waterproof, IP65,
    OEM board possible
  • LoRaWAN Stack
    LobaWAN 1.0.1
    Licensing possible!
  • Conformity
    CE, RoHS, WEEE