Basic Piezo buzzer with 6 notes on an Adafruit QT Py

qtpy-piano.py

# Uses a basic piezo buzzer to make tones: https://www.adafruit.com/product/160
# Adapted from https://learn.adafruit.com/using-piezo-buzzers-with-circuitpython-arduino/circuitpython
# QT Py can do capacitive touch sensing on 6 pins, so we can easily play 6 notes
# https://learn.adafruit.com/adafruit-qt-py/pinouts

import board
import simpleio
import touchio

# Define pin connected to piezo buzzer.
PIEZO_PIN = board.D8

# Define a list of tones/music notes to play.
TONE_FREQ = [ 262,  # C4
              294,  # D4
              330,  # E4
              349,  # F4
              392,  # G4
              440,  # A4
              494 ] # B4

touches = []
for pin in (board.A0, board.A1, board.A2, board.A3, board.TX, board.RX):
    touches.append(touchio.TouchIn(pin))

while True:
    for i in range(len(touches)):
        if touches[i].raw_value > 2500:
            simpleio.tone(PIEZO_PIN, TONE_FREQ[i], duration=0.5)
            break