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Gemma/Trinket_Gemma_Mini_Theramin/Trinket_Gemma_Mini_Theramin.ino

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+// SPDX-FileCopyrightText: 2017 Limor Fried/ladyada for Adafruit Industries
+// SPDX-FileCopyrightText: 2017 Phillip Burgess for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+/* Adafruit Trinket/Gemma Example: Simple Theramin
+
+  Read the voltage from a Cadmium Sulfide (CdS) photocell voltage
+  divider and output a corresponding tone to a piezo buzzer
+
+  Wiring: Photocell voltage divider center wire to GPIO #2
+  (analog 1) and output tone to GPIO #0 (digital 0)
+
+  Note: The Arduino tone library does not work for the ATTiny85 on the
+  Trinket and Gemma.  The beep function below is similar.  The beep
+  code is adapted from Dr. Leah Buechley at
+  http://web.media.mit.edu/~leah/LilyPad/07_sound_code.html
+*/
+
+#define SPEAKER   0    // Speaker connected to this DIGITAL pin #
+#define PHOTOCELL 1    // CdS photocell connected to this ANALOG pin #
+#define SCALE     2.0  // You can change this to change the tone scale
+
+void setup() {
+  // Set SPEAKER pin to output to drive the piezo buzzer (important)
+  pinMode(SPEAKER, OUTPUT);
+}
+
+void loop() {
+  // Read PHOTOCELL analog pin for the current CdS divider voltage
+  int reading = analogRead(PHOTOCELL);
+  // Change the voltage to a frequency.  You can change the values
+  // to scale your frequency range.
+  int freq = 220 + (int)(reading * SCALE);
+  // Output the tone to SPEAKER pin.  You can change the '400'
+  // to different times (in milliseconds).
+  beep(SPEAKER, freq, 400);
+  delay(50); // Delay a bit between notes (also adjustable to taste)
+}
+
+// The sound-producing function
+void beep (unsigned char speakerPin, int frequencyInHertz, long timeInMilliseconds)
+{ // http://web.media.mit.edu/~leah/LilyPad/07_sound_code.html
+  int  x;
+  long delayAmount = (long)(1000000 / frequencyInHertz);
+  long loopTime = (long)((timeInMilliseconds * 1000) / (delayAmount * 2));
+  for (x = 0; x < loopTime; x++) {
+    digitalWrite(speakerPin, HIGH);
+    delayMicroseconds(delayAmount);
+    digitalWrite(speakerPin, LOW);
+    delayMicroseconds(delayAmount);
+  }
+}

Gemma/Trinket_Gemma_Mini_Theramin/code.py

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+# SPDX-FileCopyrightText: 2017 Limor Fried/ladyada for Adafruit Industries
+# SPDX-FileCopyrightText: 2017 Phillip Burgess for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""
+Adafruit Trinket/Gemma Example: Simple Theramin
+Read the voltage from a Cadmium Sulfide (CdS) photocell voltage
+divider and output a corresponding tone to a piezo buzzer
+
+Photocell voltage divider center wire to GPIO #2 (analog 1)
+and output tone to GPIO #0 (digital 0)
+"""
+
+import time
+
+import analogio
+import board
+import pwmio
+
+photocell_pin = board.A1  # CdS photocell connected to this ANALOG pin
+speaker_pin = board.D0  # Speaker is connected to this DIGITAL pin
+scale = 0.03  # Change this to adjust tone scale
+
+# Initialize input/output pins
+photocell = analogio.AnalogIn(photocell_pin)
+pwm = pwmio.PWMOut(speaker_pin, variable_frequency=True, duty_cycle=0)
+
+while True:  # Loop forever...
+    # Read photocell analog pin and convert voltage to frequency
+    pwm.frequency = 220 + int(scale * float(photocell.value))
+    pwm.duty_cycle = 32767  # 50% duty cycle
+    time.sleep(0.4)  # Play for 400 ms (adjust to your liking)
+    pwm.duty_cycle = 0  # Stop playing
+    time.sleep(0.05)  # Delay 50 ms between notes (also adjustable)