samuelwbarber:~$

$ ls electronics-projects

Electronics Projects

Older hardware projects from my previous site. The original text has been converted to HTML and the images have been cropped to remove the old text panels.

Green CNC A3 plotter render with gantry and rails

E01

CNC A3 Plotter

A3 paper plotter designed to be low cost and simple to build. The mechanism uses 3D printed parts designed in Fusion 360 and can plot at up to 150 mm/s. The control software was written for Arduino. The project files were released as open source.

Thingiverse model
Blue credit card sized Simon game PCB front and back

E02

Credit Card Sized Game

Credit-card sized remake of the Simon memory game. It uses capacitive touch inputs, variable difficulty, an Atmel 328P microcontroller, and a standard programming header for firmware updates.

Two channel bench power supply with knobs and display

E03

2 Channel Bench Power Supply

Two-channel bench power supply based on LM2576HVT-ADJ switch regulators and an Arduino microcontroller. A 128x64 dot-matrix display is used for the user interface, with front-panel controls for bench use.

4000 series logic clock prototype on a desk

E04

4000s Series Logic Clock

Digital clock built entirely from 4000-series logic with no microcontroller. CD4026 decade counter/display driver chips control the display and a CD4060 provides the timing source. The parts cost was under GBP 10.

Rolling BB8 style RC car prototype and black spherical shell

E05

Rolling BB8 Style RC Car

BB8-inspired rolling RC car using DC motors, two Arduinos, and NRF24L01 radio modules. One controller handles the transmitter side and the other handles the vehicle. The project was a work in progress and still needed better mechanical control.

Electric shock clock with LCD and circuit board

E06

Electric Shock Clock

Alarm clock built from a modified electric shock pen, Arduino, character display, RTC, and supporting parts. It supports alarm modes with or without electric shock, birthday reminders, and automatic display dimming at night.

Two black Bluetooth stereo speaker amplifier boxes

E07

True Wireless Bluetooth Stereo Speaker Amplifiers

Pair of Bluetooth amplifier and receiver modules for converting old bookshelf speakers into wireless speakers. The modules were built from TWS Bluetooth earbud electronics and LM358 amplifier circuits, avoiding the need for an audio cable between speakers.

Mug warmer plate and control electronics

E08

Mug Warmer Plate

Temperature-controlled mug warmer plate. An LM358 op-amp is used as a comparator with thermistor feedback to regulate the plate temperature.

T12 soldering station with soldering iron and tips

E09

T12 Soldering Station

Soldering station designed for Hakko T12 cartridge tips. The cartridge tips heat quickly and have good thermal mass. The full project cost was under GBP 35, with replacement tips costing GBP 1-2 each.