Add support for HTS221 capacitive digital sensor for relative humidity and temperature (#295)

hts221: Add support for hts221.go

hts221/hts221_nano_33_ble.go

@@ -0,0 +1,28 @@
+// +build nano_33_ble
+
+package hts221
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers"
+)
+
+// New creates a new HTS221 connection. The I2C bus must already be
+// configured.
+//
+// This function only creates the Device object, it does not touch the device.
+func New(bus drivers.I2C) Device {
+	// turn on internal power pin (machine.P0_22) and I2C1 pullups power pin (machine.P1_00)
+	// and wait a moment.
+	ENV := machine.P0_22
+	ENV.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	ENV.High()
+	R := machine.P1_00
+	R.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	R.High()
+	time.Sleep(time.Millisecond * 10)
+
+	return Device{bus: bus, Address: HTS221_ADDRESS}
+}