A piano module for the micro:bit with micropython example

This is an interesting add-on for the micro:bit, its a little piano. Lets take a look at it

It has the following features

  • micro:bit edge connector, directly pluggable
  • Buzzer to play music
  • Onboard capacitive touch controller, 13x touch keys through I2C interface, this actually uses a TTP229 IC
  • 4x RGB LEDs, controlled by only one signal pin
  • Breakout module control pins, micro:bit SPI pins, and some of the GPIO pins, easy expansion

The board uses the following pins, so that means you will not be able to use P0 and P1 for anything else

Function DESCRIPTION
P0 Buzzer control pin, related to mcro:bit P0
P1 LED control pin, related to mcro:bit P1
SCL Touch keys control pin, I2C clock
SDA Touch keys control pin, I2C data

 

Parts List

About $20 for the module

Name Link
Micro:bit Micro:bit Development Board
Mini Piano Module Elecrow Mini Piano Module with I2C Interface for Micro: bit

Code

There is a very good micropython example and here it is

# Add your Python code here. E.g.
from microbit import *
import neopixel
import music
from random import randint
 
rgb = neopixel.NeoPixel(pin1, 4)
 
class PIANO():
    def __init__(self):
        #The piano key corresponds to the touch screen value.
        self.Zero = 0x0000
        self.C    = 0x0001
        self.bD   = 0x0002
        self.D    = 0x0004
        self.bE   = 0x0008
        self.E    = 0x0010
        self.F    = 0x0020
        self.bG   = 0x0040
        self.G    = 0x0080
        self.bA   = 0x0100
        self.A    = 0x0200
        self.bB   = 0x0400
        self.B    = 0x0800
        self.C1   = 0x1000
        self.play = self.Zero
 
    def TouchPress(self):
        try:
            arr = i2c.read(0x57, 2)
            val = arr[0] + arr[1] * 256
        except OSError:
            val = 0xffff
        return val
 
    def ShowRGB(self,RGB):
        for rgb_id in range(0, 4):
            rgb[rgb_id] = (RGB[rgb_id][0], RGB[rgb_id][1], RGB[rgb_id][2])
            rgb.show()
 
    def Color(self):
        red   = randint(0, 30)
        green = randint(0, 30)
        blue  = randint(0, 30)
        for rgb_id in range(0, 4):
            rgb[rgb_id] = (red, green, blue)
        return rgb
 
    def PlayPiano(self):
        TPval = self.TouchPress()
        if TPval & self.play != 0:
            TPval = TPval & self.play
        elif TPval == self.C:
            self.ShowRGB(self.Color())
            music.pitch(262, wait=False)
        elif TPval == self.bD:
            self.ShowRGB(self.Color())
            music.pitch(277, wait=False)
        elif TPval == self.D:
            self.ShowRGB(self.Color())
            music.pitch(294, wait=False)
        elif TPval == self.bE:
            self.ShowRGB(self.Color())
            music.pitch(311, wait=False)
        elif TPval == self.E:
            self.ShowRGB(self.Color())
            music.pitch(330, wait=False)
        elif TPval == self.F:
            self.ShowRGB(self.Color())
            music.pitch(349, wait=False)
        elif TPval == self.bG:
            self.ShowRGB(self.Color())
            music.pitch(370, wait=False)
        elif TPval == self.G:
            self.ShowRGB(self.Color())
            music.pitch(392, wait=False)
        elif TPval == self.bA:
            self.ShowRGB(self.Color())
            music.pitch(415, wait=False)
        elif TPval == self.A:
            self.ShowRGB(self.Color())
            music.pitch(440, wait=False)
        elif TPval == self.bB:
            self.ShowRGB(self.Color())
            music.pitch(466, wait=False)
        elif TPval == self.B:
            self.ShowRGB(self.Color())
            music.pitch(494, wait=False)
        elif TPval == self.C1:
            self.ShowRGB(self.Color())
            music.pitch(523, wait=False)
        elif TPval == self.Zero:
            rgb.clear()
            music.stop()
        if TPval != 0xffff:
            self.play = TPval
 
Piano = PIANO()
while True:
    Piano.PlayPiano()

 

Link

Microbit-piano-demo-Petr

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