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()
1 comment
Thak you for code, it works great. As I am newbie, not all commands are clear for me, is it possible to get more commented code?
Tx