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Electronics

Wiring diagram source file: ../hardware/fritzing/kazkar_wiring_diagram.fzz

Overview

Казкар is built around an Arduino Uno, a microSD card module, three large momentary pushbuttons, and an 8Ω speaker. The device was first proven on a breadboard, then integrated into a temporary plastic case, and finally rebuilt into a laser-cut MDF enclosure.

The electronics are prototype-grade. It is not a manufacturing design nor PCB-based. The project is documented honestly as a working prototype: real firmware, real controls, real audio playback, and real enclosure integration.

Implemented pin mapping

The current sketch uses the following mapping:

Buttons

  • D5 — Play/Pause
  • D6 — Next
  • D7 — Previous

The buttons are configured as INPUT_PULLUP, so each switch is read as active when pressed to ground.

Audio

  • D9 — speaker output

microSD module

  • CS — D4
  • MOSI — D11
  • MISO — D12
  • SCK — D13
  • VCC — 5V
  • GND — GND

Front-panel control layout

The finished enclosure uses this button arrangement:

  • Red — Play/Pause
  • White — Previous
  • Green — Next

The Fritzing wiring diagram reflects the final physical build, including the color-to-function mapping of the front-panel controls. The code itself defines the functions by pin, not by button color.

Power

Normal portable use was through a Power Bank 2200 USB battery pack. The attached package and manual list:

  • Capacity: 2200 mAh
  • Battery type: lithium-ion
  • Rated input: DC 5V / 800 mA
  • Rated output: DC 5V / 800 mA
  • Charging time: about 3 hours
  • Protection: built-in protection for short circuit, over-charge, and over-discharge

That power source was used successfully to run the device in normal portable use.

microSD module notes

The build uses a common 6-pin SPI microSD adapter module with the following labeled pins:

  • GND
  • VCC
  • MISO
  • MOSI
  • SCK
  • CS

The photographed module matches the SPI wiring used by the sketch and the observed prototype build.

Speaker and audio path

The final build uses an 8Ω speaker with an approximately 70 mm diameter and approximately 85 mm screw-hole spacing.

The Arduino sketch drives audio from pin 9 using the TMRpcm library. The audio files are stored on the microSD card and are expected to be named sequentially, from song1.wav through song11.wav.

Firmware note

The sketch comment header has been updated to match the implemented wiring. The code now documents the actual button and SPI pin assignments used by the final build.

What is not yet included

This repository still does not include:

  • PCB layout
  • KiCad source
  • finalized amplifier stage
  • measured runtime testing
  • exact original part numbers for every component

The project is fully documented as a working build, while still leaving room for a more formal second-generation hardware revision later.