ds18b20 - requires https://github.com/kidoman/embd/pull/54

samples/ds18b20.go

@@ -0,0 +1,78 @@
+// +build ignore
+
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/zlowred/embd"
+	"github.com/zlowred/embd/sensor/ds18b20"
+	_ "github.com/zlowred/embd/host/rpi"
+)
+
+func main() {
+	if err := embd.InitW1(); err != nil {
+		panic(err)
+	}
+	defer embd.CloseW1()
+
+	w1 := embd.NewW1Bus(0)
+
+	devs, err := w1.ListDevices()
+
+	if err != nil {
+		panic(err)
+	}
+
+	var name string = ""
+	for _, dev := range devs {
+		if strings.HasPrefix(dev, "28-") {
+			name = dev
+			break
+		}
+	}
+
+	if name == "" {
+		fmt.Println("No DS18B20 devices found")
+	}
+
+	fmt.Printf("Using DS18B20 device %s\n", name)
+	w1d, err := w1.Open(name)
+
+	if err != nil {
+		panic(err)
+	}
+
+	sensor := ds18b20.New(w1d)
+
+	err = sensor.SetResolution(ds18b20.Resolution_12bit)
+
+	if err != nil {
+		panic(err)
+	}
+
+	err = sensor.ReadTemperature()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Measured temperature: %vC\n", sensor.Celsius())
+	fmt.Printf("Measured temperature: %vF\n", sensor.Fahrenheit())
+
+	err = sensor.SetResolution(ds18b20.Resolution_9bit)
+
+	if err != nil {
+		panic(err)
+	}
+
+	err = sensor.ReadTemperature()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Measured temperature: %vC\n", sensor.Celsius())
+	fmt.Printf("Measured temperature: %vF\n", sensor.Fahrenheit())
+}