Adding and updating data logging examples.

CircuitPython_Essentials/CircuitPython_Logger.py

@@ -19,10 +19,10 @@ try:
             fp.flush()
             led.value = not led.value
             time.sleep(1)
-except OSError as e:
-    delay = 0.5
-    if e.args[0] == 28:
-        delay = 0.25
+except OSError as e:  # Typically when the filesystem isn't writeable...
+    delay = 0.5  # ...blink the LED every half second.
+    if e.args[0] == 28:  # If the file system is full...
+        delay = 0.25  # ...blink the LED faster!
     while True:
         led.value = not led.value
         time.sleep(delay)

Getting_Started_With_Raspberry_Pi_Pico/data_logger.py

@@ -0,0 +1,26 @@
+"""
+Data logging example for Pico. Logs the temperature to a file on the Pico.
+"""
+import time
+import board
+import digitalio
+import microcontroller
+
+led = digitalio.DigitalInOut(board.LED)
+led.switch_to_output()
+
+try:
+    with open("/temperature.txt", "a") as datalog:
+        while True:
+            temp = microcontroller.cpu[0].temperature
+            datalog.write('{0:f}\n'.format(temp))
+            datalog.flush()
+            led.value = not led.value
+            time.sleep(1)
+except OSError as e:  # Typically when the filesystem isn't writeable...
+    delay = 0.5  # ...blink the LED every half second.
+    if e.args[0] == 28:  # If the filesystem is full...
+        delay = 0.25  # ...blink the LED faster!
+    while True:
+        led.value = not led.value
+        time.sleep(delay)

Getting_Started_With_Raspberry_Pi_Pico/data_logger_boot.py

@@ -0,0 +1,14 @@
+"""
+boot.py file for Pico data logging example. If pin GP0 is connected to GND when
+the pico starts up, make the filesystem writeable by CircuitPython.
+"""
+import board
+import digitalio
+import storage
+
+write_pin = digitalio.DigitalInOut(board.GP0)
+write_pin.direction = digitalio.Direction.INPUT
+write_pin.pull = digitalio.Pull.UP
+
+# If the write pin is connected to ground, CircuitPython can write to the CIRCUITPY filesystem.
+storage.remount("/", write_pin.value)