Add basic support for INA219 current sensor

samples/ina219.go

@@ -0,0 +1,49 @@
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"time"
+
+	"github.com/kidoman/embd"
+	"github.com/kidoman/embd/sensor/ina219"
+
+	_ "github.com/kidoman/embd/host/all"
+)
+
+func main() {
+	flag.Parse()
+
+	if err := embd.InitI2C(); err != nil {
+		panic(err)
+	}
+	defer embd.CloseI2C()
+
+	bus := embd.NewI2CBus(1)
+
+	ina := ina219.New(bus, 0x40, 0.1)
+	defer ina.Close()
+
+	for {
+		sv, err := ina.ShuntVoltage()
+		if err != nil {
+			panic(err)
+		}
+
+		v, err := ina.Voltage()
+		if err != nil {
+			panic(err)
+		}
+
+		c, err := ina.Current()
+		if err != nil {
+			panic(err)
+		}
+
+		fmt.Printf("Shunt Voltage=%v  Voltage=%v Current=%v\n", sv, v, c)
+
+		time.Sleep(500 * time.Millisecond)
+	}
+}