Keypad Go Brrrr

Create a mechanical keypad that plays sound effects. It runs off of an Arduino BlackPill controller and connects to a computer that publishes messages through MQTT and clients receive and play audio.

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CalvinHacks-2023

The 2023 CalvinHacks Project Files

This project is an entry as part of 2023 Calvin Hacks.

Objective

Create a mechanical keypad that triggers sound effects. The keypad interacts with a BlackPill controller that is connected to a computer. This computer publishes a MQTT that is then received by all listeners that then play the audio effect.

Hardware

  • STM32F411CE "BlackPill"
  • Raspberry PI 4
  • 16x Brown Cherry Switches
  • 16x Kailh Hot Swaps
  • 16x 1N4148 Diodes
  • 1x Custom PCB
  • 4x Pull Down Resistors

Installation

This project uses the Arduino IDE for writing and compiling. To connect with the BlackPill, the STM32CubeProgrammer was used.

  • Configuration settings to connect with the BlackPill came from this tutorial
  • The board configuration URL in the previous tutorial is depreciated. This url was used instead: https://www.sgbotic.com/index.php?dispatch=pages.view&page_id=49

Future Considerations

  • Use the STM32 HAL driver to have stronger control over the I/Os of the BlackPill.
  • Include a pull-down resistor on the PCB. When the PCB was designed it was overlooked that a pull-down resistor was necessary, leading to a breadboard being needed.
  • Use this keypad for other purposes like macros or commands.

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