airenas / 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). The sensor has possibility to retry reading on a failure.

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/airenas/ds18b20

Code

package main

import (
    "fmt"

    "github.com/airenas/ds18b20"
)

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

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

    for _, sID := range sensors {
        s, err := ds18b20.NewSensorR(sID, 3)
        if err != nil {
            panic(err)
        }
        t, err := s.Temperature()
        if err != nil {
            panic(err)
        } 
        fmt.Printf("sensor: %s temperature: %.2f\n", sID, t)
    }
}