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black-pill

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A MAX4466 microphone is read by the ADC of the STM32F401 at 16 kHz, timed by TIM2. An ADC interrupt collects 512 sample. The samples go to Hann window and a 512-point FFT, which gives the frequency content. The result is shown as 32 bars on an ILI9341 TFT over SPI and sent to a phone over Bluetooth. 3 buttons and 4 LEDs control and show the status.

  • Updated Oct 31, 2026
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