Create magnetometer.py

magnetometer.py

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+import numpy as np
+import time
+
+EARTH_FIELD = np.array([22.0, 0.0, -44.0])
+NOISE_STD = 0.2
+
+def read(x, y, z):
+    noise = np.random.normal(0, NOISE_STD, 3)
+    field = EARTH_FIELD + noise
+    return {
+        "Bx": float(field[0]),
+        "By": float(field[1]),
+        "Bz": float(field[2]),
+        "timestamp": time.time()
+    }