Merge pull request adafruit#1408 from caternuson/magtag_dishwasher

Add MagTag Dishwasher Code

Author: caternuson

MagTag_Dishwasher_Status/clean.bmp

@@ -0,0 +1,33 @@
+import time
+import board
+import alarm
+import displayio
+
+# get the display
+epd = board.DISPLAY
+epd.rotation = 270
+
+# set up pin alarms
+buttons = (board.BUTTON_A, board.BUTTON_B)  # pick any two
+pin_alarms = [alarm.pin.PinAlarm(pin=pin, value=False, pull=True) for pin in buttons]
+
+# toggle saved state
+alarm.sleep_memory[0] = not alarm.sleep_memory[0]
+
+# set bitmap
+bmp_file = "clean.bmp" if alarm.sleep_memory[0] else "dirty.bmp"
+
+# show bitmap
+with open(bmp_file, "rb") as fp:
+    bitmap = displayio.OnDiskBitmap(fp)
+    tile_grid = displayio.TileGrid(bitmap, pixel_shader=displayio.ColorConverter())
+    group = displayio.Group(max_size=1)
+    group.append(tile_grid)
+    epd.show(group)
+    time.sleep(epd.time_to_refresh + 0.01)
+    epd.refresh()
+    while epd.busy:
+        pass
+
+# go to sleep
+alarm.exit_and_deep_sleep_until_alarms(*pin_alarms)

MagTag_Dishwasher_Status/dirty.bmp

@@ -0,0 +1,63 @@
+import time
+import board
+import alarm
+import displayio
+import adafruit_lis3dh
+
+# get the display
+epd = board.DISPLAY
+
+# set up accelerometer
+lis = adafruit_lis3dh.LIS3DH_I2C(board.I2C(), address=0x19)
+
+# See: ST Design Tip DT0008 - Simple screen rotation using
+#      the accelerometer built-in 4D detection interrupt
+# pylint: disable=protected-access
+lis._write_register_byte(0x20, 0x3F)  # low power mode with ODR = 25Hz
+lis._write_register_byte(0x22, 0x40)  # AOI1 interrupt generation is routed to INT1 pin
+lis._write_register_byte(0x23, 0x80)  # FS = ±2g low power mode with BDU bit enabled
+lis._write_register_byte(
+    0x24, 0x0C
+)  # Interrupt signal on INT1 pin is latched with D4D_INT1 bit enabled
+lis._write_register_byte(
+    0x32, 0x20
+)  # Threshold = 32LSBs * 15.625mg/LSB = 500mg. (~30 deg of tilt)
+lis._write_register_byte(0x33, 0x01)  # Duration = 1LSBs * (1/25Hz) = 0.04s
+
+# read to clear
+_ = lis._read_register_byte(0x31)
+
+# get current accel values
+_, y, _ = lis.acceleration
+
+# update based on orientation
+if y > 0:
+    # upside up
+    bmp_file = "clean.bmp"
+    rotation = 270
+    irq_config = 0b01000100
+else:
+    # upside down
+    bmp_file = "dirty.bmp"
+    rotation = 90
+    irq_config = 0b01001000
+
+# show bitmap
+epd.rotation = rotation
+with open(bmp_file, "rb") as fp:
+    bitmap = displayio.OnDiskBitmap(fp)
+    tile_grid = displayio.TileGrid(bitmap, pixel_shader=displayio.ColorConverter())
+    group = displayio.Group(max_size=1)
+    group.append(tile_grid)
+    epd.show(group)
+    time.sleep(epd.time_to_refresh + 0.01)
+    epd.refresh()
+    while epd.busy:
+        pass
+
+# config accelo irq
+lis._write_register_byte(0x30, irq_config)
+
+# go to sleep
+pin_alarm = alarm.pin.PinAlarm(pin=board.ACCELEROMETER_INTERRUPT, value=True)
+alarm.exit_and_deep_sleep_until_alarms(pin_alarm)