examples: Add pressure_trend for wsen-pads.

Author: Charly-sketch

lib/wsen-pads/examples/pressure_trend.py

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+from time import sleep
+from machine import I2C
+from wsen_pads import WSEN_PADS
+from wsen_pads.const import ODR_10_HZ
+
+i2c = I2C(1)
+sensor = WSEN_PADS(i2c)
+
+sensor.set_continuous(odr=ODR_10_HZ)
+
+pressure_history = []
+MAX_VALUES = 10
+THRESHOLD = 0.12  # sensitivity (hPa) ~ 1 meter altitude change
+
+def get_trend(values):
+    if len(values) < 2:
+        return "N/A"
+
+    diff = values[-1] - values[0]
+
+    if abs(diff) < THRESHOLD:
+        return "stable"
+    elif diff > 0:
+        return "falling" # pressure rising means lower altitude
+    else:
+        return "rising"
+
+while True:
+    pressure = sensor.pressure_hpa()
+
+    # store value
+    pressure_history.append(pressure)
+
+    # keep only last 10 values
+    if len(pressure_history) > MAX_VALUES:
+        pressure_history.pop(0)
+
+    trend = get_trend(pressure_history)
+
+    print("P:", pressure, "hPa Trend:", trend)
+
+    sleep(10)