feat(wsen-hids): add low power sampling example

Author: Charly-sketch

lib/wsen-hids/examples/low_power_sampling.py

@@ -0,0 +1,31 @@
+"""Use power_off() between readings to minimize energy consumption. Read one-shot every 10s, print values, then power down. Show gc.mem_free() and elapsed time to illustrate battery-friendly usage."""
+
+import gc
+from time import sleep, ticks_diff, ticks_ms
+
+from machine import I2C
+from wsen_hids import WSEN_HIDS
+
+i2c = I2C(1)
+sensor = WSEN_HIDS(i2c)
+
+while True:
+    gc.collect()
+
+    t0 = ticks_ms()
+
+    sensor.power_on()
+
+    humidity, temperature = sensor.read_one_shot()
+
+    sensor.power_off()
+
+    elapsed_ms = ticks_diff(ticks_ms(), t0)
+
+    print("Humidity: {:.2f} %RH".format(humidity))
+    print("Temperature: {:.2f} °C".format(temperature))
+    print("Free RAM: {} bytes".format(gc.mem_free()))
+    print("Elapsed: {} ms".format(elapsed_ms))
+    print()
+
+    sleep(10)