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Readme

@redplc/node-red-rpi-ds18b20

Node-RED node for ds18b20 temperature sensor using with redPlc nodes

ds18b20 digital temperature sensor

9..12bit resolution.
Conversion time 93..750ms.
Measure range -55°C .. +125°C.
On range -10°C .. +85°C is accuracy ±0,5°C.
1-Wire connection.
Power supply 3..5.5V external or over bus (parasite power).
Each sensor has a 64-Bit ID.

Usage

Install redPlc nodes.
Use redPlc s-inject node for trigger update.
Connect to first output on s-inject node.
For logical operations use redPlc nodes.
Data is exchanged with global context variable arrays.
Array index depends on the order of the sensors.
If you add/remove sensors, array index can be change.
This node works on Raspberry Pi with 32bit or 64bit OS.
The temperature values are in °C or °F.
To prevents locks only one node is allowed.
Enable 1-wire with raspi-config.
Default 1-wire pin on Raspberry pi is GPIO4.

Set Sensor Resolution

You can change the sensor resolution with tool in subfolder setSensor.
File readme.txt describes how the tool is used.