# @redplc/node-red-rpi-ds18b20
> Node-RED node for ds18b20 temp. sensor using with redPlc nodes.
Latest version **2.0.4** (published 2023-10-21) · Apache-2.0 license · 0 weekly downloads
## Install
```sh
npm install @redplc/node-red-rpi-ds18b20
pnpm add @redplc/node-red-rpi-ds18b20
yarn add @redplc/node-red-rpi-ds18b20
bun add @redplc/node-red-rpi-ds18b20
```
## Health
**Score 15/100 (F)** — status: abandoned.
Positive: no vulnerabilities.
Warnings: low downloads; no types; no esm support.
Negative: abandoned; low maintenance score.
## Facts
| | |
|---|---|
| Version | 2.0.4 |
| Published | 2023-10-21 |
| First published | 2023-09-14 |
| Weekly downloads | 0 |
| License | Apache-2.0 |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 0 |
| Unpacked size | 220.6 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Author | Ocean |
| Maintainers | redplc |
| Keywords | node-red, iot, redplc, plc, control, raspberry pi, rpi, analog, one wire, temperature, ds18b20 |
## Links
- npm: https://www.npmjs.com/package/@redplc/node-red-rpi-ds18b20
- Issues: https://github.com/redplc/redplc/issues
- npm.io page: https://npm.io/package/@redplc/node-red-rpi-ds18b20
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## Recent versions
- 2.0.4 (latest) — 2023-10-21
- 2.0.3 — 2023-09-21
- 2.0.2 — 2023-09-14
- 2.0.1 — 2023-09-14
- 2.0.0 — 2023-09-14
## README
# @redplc/node-red-rpi-ds18b20
[](https://nodered.org)
[](https://flows.nodered.org/node/@redplc/node-red-redplc/)
[](https://www.raspberrypi.com/)
Node-RED node for [ds18b20](https://www.analog.com/en/products/ds18b20.html#product-overview) temperature sensor using with [redPlc](https://www.npmjs.com/package/@redplc/node-red-redplc/) nodes
## ds18b20 digital temperature sensor
- 9..12bit resolution.
- Conversion time 93.75..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](https://www.npmjs.com/package/@redplc/node-red-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.
## Delay with reading multiple ds18b20 digital temperature sensor
The ds18b20 digital temperature sensor needs to read temperature:
9-bit resolution -> 93.75ms.
10-bit resolution -> 187.5ms.
11-bit resolution -> 375ms.
12-bit resolution -> 750ms. (default factory set)
Because the accuracy is ±0.5°C in the range from -10°C to +85°C,
I recommend operating the sensor with 9-bit resolution.
Please note that the times apply to one sensor.
This means 10x750ms (7.5s) for 10 sensors with 12bit resolution.
There is a way to read multiple sensors more quickly.
The 1-Wire drivers from RPi Linux are not used for this,
but the sensors are addressed with their 1-Wire protocol.
In the further version I will implement this 1-Wire protocol.
## Set Sensor Resolution
You can change the sensor resolution with tool in subfolder **setSensor**.
File **readme.txt** describes how the tool is used.
---
_Source: https://npm.io/package/@redplc/node-red-rpi-ds18b20 · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._