Projects
Technical Projects
Electronic constructions and technical projects. The list can be filtered by categories and tags, searched and sorted by date or title.
Stopwatch V4.1
Electronic stopwatch for fire sport timing with three operating modes, LCD, external display support and configuration options.
Sakulno NANO 644
Compact Arduino Nano-inspired development board with an ATmega644 microcontroller, CH340G USB converter, MightyCore support and corrected USB power management.
GRBL Board
Controller board for a small gantry CNC router with GRBL firmware, ATmega328P-AU, USB or Bluetooth communication, three stepper drivers and an output for a DC spindle or laser.
Fire Brigade Stopwatch SMD
Final SMD version of the fire brigade stopwatch with a six-digit LED display, optically isolated inputs, USB communication, optional Bluetooth and support for an external large display.
Mini USB Converter
A simple step-down converter with USB output for powering or charging devices from a battery.
Solar Charger
A solar charger construction for a mobile phone, adjusted according to practical requirements.
12V to 24V Voltage Converter
A reliable STEP-UP converter construction for converting 12 V to 24 V.
Converter for 9-40W Fluorescent Tube
A converter construction for powering a 9 to 40 W fluorescent tube from a 12 V battery.
RCD Programmer
A simple serial RCD programmer for PIC microcontrollers, suitable for basic experiments and first steps with PIC programming.
Water Level Monitor
An electronic replacement for a mechanical float switch, monitoring minimum, working and emergency water levels.
Ramps-S
An Arduino MEGA shield for controlling a 3D printer, designed as a more robust replacement for RAMPS 1.4.
RaspberryPi IO Shield v1.0
A Raspberry Pi expansion shield with a DC/DC converter, optically isolated inputs and power outputs for print servers and Klipper firmware.
Electronic Gate Controller (PE4/2011)
A microcontroller-based controller for an electrically operated gate with automatic and manual modes, optical safety beam, position sensing and motor protection.
PC Starter and Resetter
A microcontroller-based device for automatically starting a PC after a power outage and optionally resetting it when watchdog pulses stop arriving.
Electronic Dice
A simple electronic dice with a PIC12F508 microcontroller, LED display of numbers 1-6 and 3-5 V supply.
Fire Brigade Stopwatch (PE11/2011)
A digital stopwatch for fire brigade attack training with two targets, six-digit display, split times, RS232 output and optically isolated inputs.
GPS Clock v1
GPS-controlled digital clock with a PIC16F628A microcontroller, six LED displays, date display and GPS receiver communication through a Bluetooth module.
7-segment Display Module
Universal seven-segment display module with ATmega328P, UART communication, AT commands, brightness control and support for both the old and new large-display protocol.
Countdown Stopwatch
Countdown stopwatch with Arduino Pro Mini, internal 2x16 LCD, output for an external large display, wired or wireless transmission and user-editable presets.
CO2 Meter (PE10/2016)
A microcontroller-based CO2 concentration meter using a calibrated FIGARO CDM4161A module, 10-step LED bar graph, status LEDs, optional I2C LCD and diagnostic UART.
Current Measurement (PE1/2017)
A microcontroller-based current and voltage measuring module with ACS712 sensor, LED bar graph, optional 4x20 I2C LCD and UART output.
Microphone Stopwatch Starter
An add-on for triggering fire-sport stopwatches from a shot sound, using an electret microphone, adjustable sensitivity, repeated-start blocking and a PIC12F508 microcontroller.
Stopwatch Falling-Edge Starter
An add-on for triggering fire-sport stopwatches on the falling edge of a pulse, with optically isolated input, relay output and PIC12F508 microcontroller.
Electricity Meter Reader v2
Microcontroller-based electricity meter reader with pulse input, LCD, ENC28J60 Ethernet module and web database logging.
ATX Power Supply Tester
A simple ATX power supply tester with a PIC16F628A microcontroller for detecting ripple on +5 V and +12 V rails, with fault indication and calibration mode.
Electronic Live Trap
Electronic live trap controller with a PIC12F508 microcontroller, PIR detection, motor-triggered mechanism and status indication.
Large Display Not Only for Stopwatches
A modular large seven-segment display for fire brigade stopwatches and other multiplexed devices, built from display, power supply and converter modules.
Laser Beam Gate
A laser beam gate for fire-brigade stopwatches, built from transmitter and receiver modules with a PIC12F675 microcontroller and relay output.
GPS Clock v2 (PE2/2015)
Second version of the GPS clock published in Praktická elektronika 2/2015, with a PIC16F628A, LED display and support for GPS receivers with RS232 or Bluetooth interface.
Serial LED Display (PE10/2015)
Serially controlled LED display published in Praktická elektronika 10/2015, intended for text and status display using a simple communication protocol.
Serial LED Adapter
Adapter for serial control of an LED display, converting simple communication commands into display control.
Digispark - Small Arduino
Small Arduino-compatible Digispark board with ATtiny85, bootloader flashing, USB driver setup and first program upload.
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