We decided to make a drum machine with a step sequencer and replaceable drum audios.
Each drum machine will contains 4 audio modules called “Element”. Each of them is a fully self contained sound chip with audio playback capability.
Techs will be used in this project:
- Raspberry Pi RP2040
- MCP23017 GPIO extender
- AW9523 constant current LED driver
- OPA8002 class AB audio amplifier
- my own MHS2 sound chips as “Elements”
I also got the step sequencer’s demo working. In this video there are only 4 keys, but the RP2040 is detecting all 8 inputs and the LED driver is also driving all 8 LEDs.
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