yryz / ds18b20

Golang get temperature from ds18b20 sensor connected to a Raspberry PI (GPIO w1 pin).

ds18b20

Get sensor data from ds18b20 connected to the Raspberry (GPIO w1 pin).

Usage

Connect DS18B20

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.

Here's what I did:

sudo echo dtoverlay=w1-gpio-pullup,gpiopin=4 >> /boot/config.txt
sudo modprobe w1_gpio && sudo modprobe w1_therm

Drivers

1-Wire drivers need to be loaded in order to create the connection between the physical sensor and the rPI. You can load them from the terminal (or from the bin/modules.sh script).

sudo modprobe wire
sudo modprobe w1-gpio
sudo modprobe w1-therm

Install

go get github.com/yryz/ds18b20

Code

package main

import (
    "fmt"

    "github.com/yryz/ds18b20"
)

func main() {
    sensors, err := ds18b20.Sensors()
    if err != nil {
        panic(err)
    }

    fmt.Printf("sensor IDs: %v\n", sensors)

    for _, sensor := range sensors {
        t, err := ds18b20.Temperature(sensor)
        if err == nil {
            fmt.Printf("sensor: %s temperature: %.2f°C\n", sensor, t)
        }
    }
}