Added type annotations to adafruit_ahtx0.py

adafruit_ahtx0.py

@@ -30,18 +30,26 @@
 """
 
 import time
+
+try:
+    # This is only needed for typing
+    import busio  # pylint: disable=unused-import
+except ImportError:
+    pass
+
+
 from adafruit_bus_device.i2c_device import I2CDevice
 from micropython import const
 
-__version__ = "0.0.0-auto.0"
-__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_AHTx0.git"
+__version__: str = "0.0.0-auto.0"
+__repo__: str = "https://github.com/adafruit/Adafruit_CircuitPython_AHTx0.git"
 
-AHTX0_I2CADDR_DEFAULT = const(0x38)  # Default I2C address
-AHTX0_CMD_CALIBRATE = const(0xE1)  # Calibration command
-AHTX0_CMD_TRIGGER = const(0xAC)  # Trigger reading command
-AHTX0_CMD_SOFTRESET = const(0xBA)  # Soft reset command
-AHTX0_STATUS_BUSY = const(0x80)  # Status bit for busy
-AHTX0_STATUS_CALIBRATED = const(0x08)  # Status bit for calibrated
+AHTX0_I2CADDR_DEFAULT: int = const(0x38)  # Default I2C address
+AHTX0_CMD_CALIBRATE: int = const(0xE1)  # Calibration command
+AHTX0_CMD_TRIGGER: int = const(0xAC)  # Trigger reading command
+AHTX0_CMD_SOFTRESET: int = const(0xBA)  # Soft reset command
+AHTX0_STATUS_BUSY: int = const(0x80)  # Status bit for busy
+AHTX0_STATUS_CALIBRATED: int = const(0x08)  # Status bit for calibrated
 
 
 class AHTx0:
@@ -78,7 +86,7 @@ class AHTx0:
 
     """
 
-    def __init__(self, i2c_bus, address=AHTX0_I2CADDR_DEFAULT):
+    def __init__(self, i2c_bus: busio.I2C, address: int = AHTX0_I2CADDR_DEFAULT):
         time.sleep(0.02)  # 20ms delay to wake up
         self.i2c_device = I2CDevice(i2c_bus, address)
         self._buf = bytearray(6)
@@ -88,14 +96,14 @@ def __init__(self, i2c_bus, address=AHTX0_I2CADDR_DEFAULT):
         self._temp = None
         self._humidity = None
 
-    def reset(self):
+    def reset(self) -> None:
         """Perform a soft-reset of the AHT"""
         self._buf[0] = AHTX0_CMD_SOFTRESET
         with self.i2c_device as i2c:
             i2c.write(self._buf, start=0, end=1)
         time.sleep(0.02)  # 20ms delay to wake up
 
-    def calibrate(self):
+    def calibrate(self) -> bool:
         """Ask the sensor to self-calibrate. Returns True on success, False otherwise"""
         self._buf[0] = AHTX0_CMD_CALIBRATE
         self._buf[1] = 0x08
@@ -109,26 +117,26 @@ def calibrate(self):
         return True
 
     @property
-    def status(self):
+    def status(self) -> int:
         """The status byte initially returned from the sensor, see datasheet for details"""
         with self.i2c_device as i2c:
             i2c.readinto(self._buf, start=0, end=1)
         # print("status: "+hex(self._buf[0]))
         return self._buf[0]
 
     @property
-    def relative_humidity(self):
+    def relative_humidity(self) -> int:
         """The measured relative humidity in percent."""
         self._readdata()
         return self._humidity
 
     @property
-    def temperature(self):
+    def temperature(self) -> int:
         """The measured temperature in degrees Celsius."""
         self._readdata()
         return self._temp
 
-    def _readdata(self):
+    def _readdata(self) -> None:
         """Internal function for triggering the AHT to read temp/humidity"""
         self._buf[0] = AHTX0_CMD_TRIGGER
         self._buf[1] = 0x33