adding an example of multiple I2C QT Rotary Encoders

Author: jedgarpark

Seesaw_QT_Rotary_Encoder_Multiples/code.py

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+# SPDX-FileCopyrightText: 2021 John Park
+# SPDX-License-Identifier: MIT
+
+# I2C rotary encoder multiple test example.
+# solder the A0 jumper on the second QT Rotary Encoder board
+
+import board
+from adafruit_seesaw import seesaw, rotaryio, digitalio, neopixel
+
+qt_enc1 = seesaw.Seesaw(board.I2C(), addr=0x36)
+qt_enc2 = seesaw.Seesaw(board.I2C(), addr=0x37)
+
+qt_enc1.pin_mode(24, qt_enc1.INPUT_PULLUP)
+button1 = digitalio.DigitalIO(qt_enc1, 24)
+button_held1 = False
+
+qt_enc2.pin_mode(24, qt_enc2.INPUT_PULLUP)
+button2 = digitalio.DigitalIO(qt_enc2, 24)
+button_held2 = False
+
+encoder1 = rotaryio.IncrementalEncoder(qt_enc1)
+last_position1 = None
+
+encoder2 = rotaryio.IncrementalEncoder(qt_enc2)
+last_position2 = None
+
+pixel1 = neopixel.NeoPixel(qt_enc1, 6, 1)
+pixel1.brightness = 0.2
+pixel1.fill(0xff0000)
+
+pixel2 = neopixel.NeoPixel(qt_enc2, 6, 1)
+pixel2.brightness = 0.2
+pixel2.fill(0x0000ff)
+
+
+while True:
+
+    # negate the position to make clockwise rotation positive
+    position1 = -encoder1.position
+    position2 = -encoder2.position
+
+    if position1 != last_position1:
+        last_position1 = position1
+        print("Position 1: {}".format(position1))
+
+    if not button1.value and not button_held1:
+        button_held1 = True
+        pixel1.brightness = 0.5
+        print("Button 1 pressed")
+
+    if button1.value and button_held1:
+        button_held1 = False
+        pixel1.brightness = 0.2
+        print("Button 1 released")
+
+
+    if position2 != last_position2:
+        last_position2 = position2
+        print("Position 2: {}".format(position2))
+
+    if not button2.value and not button_held2:
+        button_held2 = True
+        pixel2.brightness = 0.5
+        print("Button 2 pressed")
+
+    if button2.value and button_held2:
+        button_held2 = False
+        pixel2.brightness = 0.2
+        print("Button 2 released")