veml6070: add Vishay UV light sensor

examples/veml6070/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"time"
+
+	"machine"
+
+	"tinygo.org/x/drivers/veml6070"
+)
+
+func main() {
+	machine.I2C0.Configure(machine.I2CConfig{})
+	sensor := veml6070.New(machine.I2C0)
+
+	if !sensor.Configure() {
+		println("VEML6070 could not be configured")
+		return
+	}
+
+	println("VEML6070 configured")
+
+	for {
+		intensity, _ := sensor.ReadUVALightIntensity()
+		println("UVA light intensity:", float32(intensity)/1000.0, "W/(m*m)")
+
+		switch sensor.GetEstimatedRiskLevel(intensity) {
+		case veml6070.UVI_RISK_LOW:
+			println("UV risk level: low")
+		case veml6070.UVI_RISK_MODERATE:
+			println("UV risk level: moderate")
+		case veml6070.UVI_RISK_HIGH:
+			println("UV risk level: high")
+		case veml6070.UVI_RISK_VERY_HIGH:
+			println("UV risk level: very high")
+		case veml6070.UVI_RISK_EXTREME:
+			println("UV risk level: extreme")
+		}
+
+		time.Sleep(2 * time.Second)
+	}
+}