Project #20: CircuitPython – Audio Out WAV – Mk02

Project #20: CircuitPython – Audio Out WAV – Mk02

https://www.donluc.com/?p=2930

#DonLucElectronics #DonLuc #METROM0Express #CircuitPython #Sound #Project #Fritzing #Programming #Electronics #Microcontrollers #Consultant

Play a Wave File

You can use any supported wave file you like. CircuitPython supports mono or stereo, at 22 KHz sample rate, or less, and 16-bit WAV format. The METRO M0 Express boards support only mono. The reason for mono is that there's only one analog output on those boards. The 22 KHz or less because the CircuitPython can't handle more data than that, and also it will not sound much better, and the DAC output is 10-bit so anything over 16-bit will just take up room without better quality. Since the WAV file must fit on the CircuitPython file system, it must be under 2 MB.

HamletUMk01.wav = 1316 KB

We're going to play the wave file for 10 seconds, pause it, wait for a button to be pressed, and then resume the file to play through to the end. Then it loops back to the beginning and starts again. First we create the button object, assign it to pin A1, and set it as an input with a pull-up.

Now we will ask the audio playback system to load the wave data from the file HamletUMk01.wav and finally request that the audio is played through the A0 analog output pin. The audio file is now ready to go, and can be played at any time with play. Inside our loop, we start by playing the file.

DL2112Mk02

1 x Adafruit METRO M0 Express
1 x SparkFun Audio Jack Breakout
1 x Audio Jack 3.5mm
1 x Hamburger Mini Speaker
1 x Tactile Button
1 x 10K potentiometer
1 x Knob
1 x 100uF 16V Electrolytic Capacitors
1 x SparkFun Cerberus USB Cable

Adafruit METRO M0 Express

AUD - Analog A0
BUT - Analog A1
VIN - +3.3V
VIN - +5V
GND - GND

code.py

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