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Overview

Introduction​

The Pomodoro Timer Solder Kit is a hands-on soldering project that combines electronics education with productivity enhancement. Based on the RP2040 microcontroller, this kit allows you to build a fully customizable timer that follows the popular Pomodoro work-rest technique. Whether you prefer 25-minute work sessions with 5-minute breaks or longer 45/15 intervals, this timer can be easily adjusted in 5-minute increments.

Designed as a Level 2 soldering challenge, it helps intermediate makers refine their soldering skills while assembling a practical and stylish desktop productivity tool. The finished timer features a four-digit 7-segment display, RGB LED for visual status indication, and a programmable buzzer for session alerts. It’s powered via USB-C and can be reprogrammed in MicroPython, giving you complete control over timing, colors, and melodies.

Pomodoro Timer Solder Kit
Pomodoro Timer Solder Kit

Which product is this documentation for?​

Pomodoro Timer Solder Kit

Pomodoro Timer Solder Kit

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Contents of the kit​

Pomodoro Timer Solder Kit Contents
  • PCB: 7×7 cm Pomodoro Timer circuit board with through-hole components and clear silkscreen markings
  • Microcontroller: RP2040 dual-core ARM Cortex-M0+ (133 MHz, 264 KB SRAM), fully reprogrammable via USB-C, comes pre-programmed
  • Display: 4-digit 7-segment LED display for clear time visualization
  • RGB LED: WS2812B addressable LED providing instant visual feedback (work, rest, or transition)
  • Buzzer: Piezo buzzer with 4 jumper-selectable melodies for work/rest notifications
  • Buttons (4x):
    • Start / Pause
    • Reset
    • Increase time
    • Decrease time
  • Resistors and capacitors: For timing, signal conditioning, and display operation
  • USB-C connector: For power and programming
  • Headers and jumpers: For melody selection and debug pins
  • Miscellaneous components: Diodes, transistors, IC sockets, and supporting components
  • Comprehensive documentation: Step-by-step illustrated guide covering both assembly and electronics theory
  • Open-source files:
    • Schematics and KiCad design files
    • MicroPython firmware
    • 3D-printable enclosure models

Key features​

  • RP2040 Microcontroller: Dual-core ARM Cortex-M0+ at 133 MHz with 264 KB SRAM, pre-programmed
  • MicroPython Programmable: Fully customizable timing logic, RGB LED behavior, and buzzer melodies
  • 4-Digit 7-Segment Display: Bright and easy-to-read time indication
  • Intuitive Controls: Dedicated buttons for start, pause, reset, and time adjustment
  • RGB Status LED: Clear visual feedback — red for work, green for rest, yellow for transition
  • Selectable Audio Alerts: Jumper-based selection of buzzer melodies for work/rest transitions
  • Compact Design: 7×7 cm PCB ideal for any workspace
  • USB-C Power: Single cable for both power and programming
  • Open Source: Includes all design, code, and enclosure files for complete customization
  • Educational Focus: Ideal for learning soldering, microcontroller programming, and timer logic