STM32F407 Step Sequencer

This project is a hardware sequencer built on the STM32F407 microcontroller, combining buttons, LEDs, and an audio codec to create a small, interactive music instrument.

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How It Works

Input

1. Potentiometer — controls BPM (tempo)
2. Mode Button — switches between PLAY and EDIT modes. Holding it in PLAY or FX mode enters REC mode
3. CLEAR Button — clears the whole pattern (PLAY) or clears the selected sample (EDIT)
4. FX Button — enters FX mode
5. TM1638 Module — 16 buttons for sample triggering and editing

Output

1. LEDs — indicate the current step in PLAY mode or the selected slot/sample in EDIT mode
2. Audio Output — using the CS43L22 codec in analog mode (via DAC). Driver taken from an online tutorial

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Usage

PLAY Mode

• Press any of the 16 buttons on the TM1638 module to play one of 16 samples
• LEDs light up in sequence to visually indicate the current step

EDIT Mode

• First press selects a sample; pressing CLEAR cancels the selection
• Subsequent presses assign the sample to one or more of the 16 steps
• LEDs show which steps are occupied by the selected sample

REC Mode

• Hold the mode button and press a button to record a sample or effect into the pattern

FX Mode

• Hold a button to apply a corresponding effect to the pattern
• Currently, only reverb is implemented; more effects are planned

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Audio Output

Connect any speaker or headphones to the mini-jack on the board to hear the sound

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Hardware

• STM32F407 Discovery or compatible board
• TM1638 module (16 buttons + LEDs)
• Potentiometer and buttons for control

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Notes

• This is an experimental, in-progress project
• The code is a mix of embedded input handling, step sequencing logic, and audio output