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Gemma/GemmaM0_Radio_Tuning_Knob/code.py

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+# SPDX-FileCopyrightText: 2018 John Edgar Park for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+# Gemma Radio Tuning Knob
+# for fine tuning Software Defined Radio CubicSDR software
+# 10k pot hooked to 3v, A2, and D2 acting as GND
+
+import time
+
+import board
+import usb_hid
+from adafruit_hid.keyboard import Keyboard
+from adafruit_hid.keycode import Keycode
+from analogio import AnalogIn
+from digitalio import DigitalInOut, Direction
+
+d2_ground = DigitalInOut(board.D2)
+d2_ground.direction = Direction.OUTPUT
+d2_ground.value = False
+analog2in = AnalogIn(board.A2)
+
+led = DigitalInOut(board.D13)
+led.direction = Direction.OUTPUT
+
+pot_max = 3.29
+pot_min = 0.00
+step = (pot_max - pot_min) / 10.0
+last_knob = 0
+
+
+def steps(x):
+    return round((x - pot_min) / step)
+
+
+def getVoltage(pin):
+    return (pin.value * 3.3) / 65536
+
+
+def spamKey(code):
+    knobkeys = [Keycode.RIGHT_BRACKET, Keycode.RIGHT_BRACKET,
+                Keycode.RIGHT_BRACKET, Keycode.RIGHT_BRACKET,
+                Keycode.RIGHT_BRACKET, Keycode.SPACE,
+                Keycode.LEFT_BRACKET, Keycode.LEFT_BRACKET,
+                Keycode.LEFT_BRACKET, Keycode.LEFT_BRACKET,
+                Keycode.LEFT_BRACKET]
+    spamRate = [0.01, 0.05, 0.125, 0.25, 0.5,
+                0.5, 0.5, 0.25, 0.125, 0.05, 0.01]
+    kbd = Keyboard(usb_hid.devices)
+    kbd.press(knobkeys[code])  # which keycode is entered
+    kbd.release_all()
+    time.sleep(spamRate[code])  # how fast the key is spammed
+
+
+while True:
+    knob = (getVoltage(analog2in))
+    if steps(knob) == 5:  # the center position is active
+        led.value = True
+    elif steps(knob) != 5:
+        led.value = False
+        spamKey(steps(knob))