Merge pull request #16 from caternuson/iss7

Bi-bolor 24-bar bargraph support

adafruit_ht16k33/bargraph.py

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+# The MIT License (MIT)
+#
+# Copyright (c) 2018 Carter Nelson for Adafruit Industries
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+"""
+`adafruit_ht16k33.bargraph`
+===========================
+
+* Authors: Carter Nelson for Adafruit Industries
+
+"""
+
+from adafruit_ht16k33.ht16k33 import HT16K33
+
+class Bicolor24(HT16K33):
+    """Bi-color 24-bar bargraph display."""
+
+    LED_OFF = 0
+    LED_RED = 1
+    LED_GREEN = 2
+    LED_YELLOW = 3
+
+    def __getitem__(self, key):
+        # map to HT16K33 row (x) and column (y), see schematic
+        x = key % 4 + 4 * (key // 12)
+        y = key // 4 - 3 * (key // 12)
+        # construct the color value and return it
+        return self._pixel(x, y) | self._pixel(x+8, y) << 1
+
+    def __setitem__(self, key, value):
+        # map to HT16K33 row (x) and column (y), see schematic
+        x = key % 4 + 4 * (key // 12)
+        y = key // 4 - 3 * (key // 12)
+        # conditionally turn on red LED
+        self._pixel(x, y, value & 0x01)
+        # conditionally turn on green LED
+        self._pixel(x+8, y, value >> 1)
+
+    def fill(self, color):
+        """Fill the whole display with the given color."""
+        what_it_was = self.auto_write
+        self.auto_write = False
+        for i in range(24):
+            self[i] = color
+        self.show()
+        self.auto_write = what_it_was

examples/bicolor24.py

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+# Basic example of using the Bi-color 24 segment bargraph display.
+# This example and library is meant to work with Adafruit CircuitPython API.
+# Author: Carter Nelson
+# License: Public Domain
+
+import time
+
+# Import board related modules
+import board
+import busio
+
+# Import the Bicolor24 driver from the HT16K33 module
+from adafruit_ht16k33.bargraph import Bicolor24
+
+# Create the I2C interface
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# Create the LED bargraph class.
+bc24 = Bicolor24(i2c)
+
+# Set individual segments of bargraph
+bc24[0] = bc24.LED_RED
+bc24[1] = bc24.LED_GREEN
+bc24[2] = bc24.LED_YELLOW
+
+time.sleep(2)
+
+# Turn them all off
+bc24.fill(bc24.LED_OFF)
+
+# Turn them on in a loop
+for i in range(24):
+    bc24[i] = bc24.LED_RED
+    time.sleep(0.1)
+    bc24[i] = bc24.LED_OFF
+
+time.sleep(1)
+
+# Fill the entrire bargraph
+bc24.fill(bc24.LED_GREEN)