check for accelerometer before initialising

Author: FoamyGuy

adafruit_pybadger/pybadge.py

@@ -64,13 +64,18 @@ def __init__(self):
                 self._accelerometer = None
 
         if i2c is not None:
-            int1 = digitalio.DigitalInOut(board.ACCELEROMETER_INTERRUPT)
-            try:
-                self._accelerometer = adafruit_lis3dh.LIS3DH_I2C(
-                    i2c, address=0x19, int1=int1
-                )
-            except ValueError:
-                self._accelerometer = adafruit_lis3dh.LIS3DH_I2C(i2c, int1=int1)
+            while not i2c.try_lock():
+                pass
+            _i2c_devices = i2c.scan()
+            i2c.unlock()
+            if (int(0x18) in _i2c_devices):  # PyBadge LC doesn't have accelerometer
+                int1 = digitalio.DigitalInOut(board.ACCELEROMETER_INTERRUPT)
+                try:
+                    self._accelerometer = adafruit_lis3dh.LIS3DH_I2C(
+                        i2c, address=0x19, int1=int1
+                    )
+                except ValueError:
+                    self._accelerometer = adafruit_lis3dh.LIS3DH_I2C(i2c, int1=int1)
 
         # NeoPixels
         self._neopixels = neopixel.NeoPixel(