Activities/Turtle Art/Programmable Brick: Difference between revisions

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      else:
          lc.heap.append(0) # no mouse event
+====Device I/O====
+ # This Python block returns with the brightness sensor value in the heap
+ # a range of parameters can be measured, for example, substitute any of
+ # these strings for the string in the program below.
+ #
+ # /sys/devices/platform/olpc-battery.0/power_supply/olpc-battery/current_now
+ # /sys/devices/platform/olpc-battery.0/power_supply/olpc-battery/voltage_now
+ # /sys/devices/platform/dcon/backlight/dcon-bl/actual_brightness
+ def myblock(tw, x):  # ignores second argument
+    import os
+    # The light sensor is only available on the XO 1.75
+    device = '/sys/devices/platform/olpc-ols.0/power_state'
+    if os.path.exists(device):
+        fh = open(device)
+        string = fh.read()
+        fh.close()
+        tw.lc.heap.append(int(string))  # append as integer value to heap
+    else:
+        tw.lc.heap.append(-1)
+ # If you can work out how to use them...
+ # accelerometer: /dev/input/event0 ???
+ # power button: /dev/input/event1
+ # lid switch: /dev/input/event2
+ # ebook: /dev/input/event3
+ # headphone jack: /dev/input/event7
+ # microphone jack: /dev/input/event8
+ # rotate, cursor, and game pad keys: /dev/input/event10
 ===Understanding the structure of the Turtle Art program===