6/18/2023 0 Comments Tonegenerator arduino too quietBe sure to try the littleBits synth filter, envelope and delay modules, too. The “analog” position produces a quieter, mellower timbre thanks to the low pass filter. The “pwm” position doesn’t filter the square wave and you will hear it loud and nasty. Should you build this project yourself, try both switch positions. The “analog” switch position turns on the filtering. The D5 and D9 output pins on the littleBits Arduino module have a switch that enables or disables low pass filtering. If you would like to learn more about this project, then read about the design of this simple Arduino-based sequencer and tone generator. The sketch calls the Arduino tone() function to play notes by sending a square wave at the desired frequency to output pin D5. The loop has a delay() in it and the loop keeps track of the remaining duration of the currently playing note. After the loop plays the last note in the array, it goes back to the beginning of the array. The Arduino loop() function steps through the array of notes and plays one note at a time. Each note has a pitch (frequency) and a duration (milliseconds). To keep things simple, I wrote a sketch that implements a basic note sequencer. The knobs on the dimmers are my own touch they aren’t standard-issue with the littleBits dimmers. It’s just more convenient to control the volume with a dimmer than the tiny trim pot on the synth speaker module. I put a dimmer between the output pin (D5) and the synth speaker in order to control audio volume. The controls on the left hand side don’t do anything at the moment. (Click the image to get full resolution.) The Arduino module is in the middle between the controls at the left (button and dimmers) and the synth speaker at the right. Here is a picture of the littleBits hardware. After getting the module, I was anxious to try it out even though I haven’t built a MIDI interface for it (yet). The littleBits Arduino module has the potential to be a MIDI-driven tone generator for a mono or paraphonic synthesizer.
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