A Node-RED node to read a temperature from a DS18B20 sensor
This Node-RED node is working only with DS18B20 sensors connected to a Raspberry Pi. It can't be used as a "general" node for communication with the sensor. The underlying library is a npm module, which can read a data from a DS18B20 sensors connected to a Raspberry Pi and it is used by the node.
On the Linux system where your Node-RED is running and where your sensors are connected to, make sure you have loaded all the kernel modules needed for working with 1-Wire devices, what the DS1820 sensor is.
sudo modprobe w1-gpio sudo modprobe w1-therm
It's good idea to have these modules loaded automatically at the boot time, but that's matter of how this could be done on the system you are using. It's quite a similar job on all systems, so for example my favorite Archlinux has done it this way.
Run the following command in the root directory of your Node-RED install
npm install node-red-contrib-ds18b20 --save
- you can select a 1-wire device/sensor from a dropdown list in the configuration dialog of the node
- configurable time interval of the sensor sampling
- you can configure name of the node, that could be for example the place where is the node placed, if no name set, ID of the device is used as a label