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Oscar den Uijl has created a easy (however oversampling) audio participant for SAMD21G-based Arduinos.
Mainly, this library allows you to ship an array of 8-bit samples to the DAC on pin A0, with non-compulsory extrapolation aka oversampling.
I’ve related the output pin via a 2.2μF capacitor and a 1kΩ resistor in sequence to a small and low-cost energetic speaker set such as you would use for a pc. It additionally appears to work tremendous once I join it to the AUX enter of the sound thingy on my laptop.
Notes:
Performs 8-bit samples in mono solely. Extrapolation aka oversampling can be utilized to enhance the output.
Makes use of GCLK3 and TC4, impacts TC5.
The values of the capacitor and resistor I exploit haven’t been calculated; they only occurred to be those mendacity round inside attain and their values appeared shut sufficient for this.
Sound high quality could enhance a bit if you happen to add a low-pass filter to eliminate the “steps” within the output. Extrapolation does make them smaller, however they’re nonetheless there.
When you’ve got an Arduino 33 IoT, taking part in the sound with the instance will begin whenever you faucet your breadboard, or hit your desk (Tilt!). Different Arduinos will simply loop the pattern with a brief pause in-between (I hope).
The instance will load very slowly within the Arduino IDE, as a result of there’s a massive pattern array in it, and the Arduino IDE isn’t superb at loading massive applications shortly.
Solely examined on the Arduino Nano 33 IoT, and that is an early model; YMMV.
See extra on GitHub.
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