scd30: add CO2 sensor driver

examples/scd30/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/scd30"
+)
+
+var sensor = scd30.New(machine.I2C0)
+
+func main() {
+	// The SCD30 requires clock stretching and supports I2C speeds up to 100kHz.
+	if err := machine.I2C0.Configure(machine.I2CConfig{Frequency: 50 * machine.KHz}); err != nil {
+		println("could not configure I2C:", err.Error())
+		return
+	}
+
+	if !sensor.Connected() {
+		println("SCD30 not detected")
+		return
+	}
+	if err := sensor.Configure(scd30.DefaultConfig); err != nil {
+		println("could not configure SCD30:", err.Error())
+		return
+	}
+	if err := sensor.StartContinuousMeasurement(0); err != nil {
+		println("could not start SCD30:", err.Error())
+		return
+	}
+
+	for {
+		ready, err := sensor.DataReady()
+		if err != nil {
+			println("could not read SCD30 status:", err.Error())
+			time.Sleep(time.Second)
+			continue
+		}
+		if !ready {
+			time.Sleep(250 * time.Millisecond)
+			continue
+		}
+
+		if err := sensor.Update(drivers.AllMeasurements); err != nil {
+			println("could not read SCD30 measurement:", err.Error())
+			time.Sleep(time.Second)
+			continue
+		}
+
+		println("CO2 (ppm):", sensor.CO2())
+		println("temperature (mC):", sensor.Temperature())
+		println("humidity (0.01%):", sensor.Humidity())
+	}
+}