aht20: add device

examples/aht20/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/aht20"
+)
+
+func main() {
+	machine.I2C0.Configure(machine.I2CConfig{})
+
+	dev := aht20.New(machine.I2C0)
+	dev.Configure()
+
+	dev.Reset()
+	for {
+		time.Sleep(500 * time.Millisecond)
+
+		err := dev.Read()
+		if err != nil {
+			println("Error", err)
+			continue
+		}
+
+		println("temp    ", fmtD(dev.DeciCelsius(), 3, 1), "C")
+		println("humidity", fmtD(dev.DeciRelHumidity(), 3, 1), "%")
+	}
+}
+
+func fmtD(val int32, i int, f int) string {
+	result := make([]byte, i+f+1)
+	neg := false
+
+	if val < 0 {
+		val = -val
+		neg = true
+	}
+
+	for p := len(result) - 1; p >= 0; p-- {
+		result[p] = byte(int32('0') + (val % 10))
+		val = val / 10
+
+		if p == i+1 && p > 0 {
+			p--
+			result[p] = '.'
+		}
+	}
+
+	if neg {
+		result[0] = '-'
+	}
+
+	return string(result)
+}