adding inclinometer example

examples/lsm303_accel_inclinometer.py

@@ -0,0 +1,29 @@
+""" Display inclination data five times per second """
+
+import time
+from math import atan2, degrees
+import board
+import busio
+import adafruit_lsm303_accel
+
+
+i2c = busio.I2C(board.SCL, board.SDA)
+sensor = adafruit_lsm303_accel.LSM303_Accel(i2c)
+
+
+def vector_2_degrees(x, y):
+    angle = degrees(atan2(y, x))
+    if angle < 0:
+        angle += 360
+    return angle
+
+
+def get_inclination(_sensor):
+    x, y, z = _sensor.acceleration
+    return vector_2_degrees(x, z), vector_2_degrees(y, z)
+
+
+while True:
+    angle_xz, angle_yz = get_inclination(sensor)
+    print("XZ angle = {:6.2f}deg   YZ angle = {:6.2f}deg".format(angle_xz, angle_yz))
+    time.sleep(0.2)