54 lines
1.3 KiB
Markdown
54 lines
1.3 KiB
Markdown
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# ds18b20
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Get sensor data from ds18b20 connected to the Raspberry (GPIO w1 pin).
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## Usage
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### Connect DS18B20
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On the Raspberry Pi, you will need to add `dtoverlay=w1-gpio"` (for regular connection) or `dtoverlay=w1-gpio,pullup="y"` (for parasitic connection) to your /boot/config.txt. The default data pin is GPIO4 (RaspPi connector pin 7), but that can be changed from 4 to `x` with `dtoverlay=w1-gpio,gpiopin=x`.
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Here's what I did:
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```
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sudo echo dtoverlay=w1-gpio-pullup,gpiopin=4 >> /boot/config.txt
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sudo modprobe w1_gpio && sudo modprobe w1_therm
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```
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### Drivers
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1-Wire drivers need to be loaded in order to create the connection between the physical sensor and the rPI.
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You can load them from the terminal (or from the bin/modules.sh script).
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sudo modprobe wire
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sudo modprobe w1-gpio
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sudo modprobe w1-therm
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### Install
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go get github.com/yryz/ds18b20
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### Code
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```go
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package main
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import (
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"fmt"
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"github.com/yryz/ds18b20"
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)
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func main() {
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sensors, err := ds18b20.Sensors()
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if err != nil {
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panic(err)
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}
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fmt.Printf("sensor IDs: %v\n", sensors)
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for _, sensor := range sensors {
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t, err := ds18b20.Temperature(sensor)
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if err == nil {
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fmt.Printf("sensor: %s temperature: %.2f°C\n", sensor, t)
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}
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}
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}
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```
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