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danjovic

DIYer, reenignE esreveR

Hack-a-çapava, SP, Brasil

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This user joined on 02/28/2014.

My Projects

Keychain USB multiple password manager/generator/injector

Key Pass

Pseudo Random VGA blinking lights generator

VGA Blinking Lights

Customisable USB adapter for arcade controls.

AVeRCADE

AVR based chess computer

Chess Mate

Version 2 of PS/2 keyboard adapter for Zeddies

Tek V2

The 2018 Hackaday Prize

Portable NTSC test pattern generator

32 Shades of Grey

View all 69 projects

My Pages

3D Case for ESP32-S2 CH32V003 Programmer
09/24/2025 at 10:32 • 0 comments

Case for the ESP32-S2 CH32V003 programmer. WIP, designed in LibreCad and modelled with Freecad.
Ye olde DIY Digispark
09/06/2025 at 12:38 • 0 comments

Found this old DIY board that I have built probably a decade ago. Time runs fast!
The wiring is done using enameled wire, thoroughly inspired by elm-chan's designs, but without the same aesthetics, though.
ESP32-S2 CH32V003 Programmer (esp32s2-funprog)
08/15/2025 at 11:28 • 0 comments

This programmer was built using an ESP32S2 board that I have laying around for some time. The project is part of ch32fun by Charles clnohr.
I decided to build it because my WCH-LinkE didn't worked out of the box with the minichlink on a Windows 11 machine.

Link to the project: https://github.com/cnlohr/esp32s2-cookbook/tree/master/ch32v003programmer

View all 68 pages

Things I've Built

Chez Le Chien

Apartment Houses for my Dachshunds

Sensor Shield

Arduino Shield for interaction with MIT's Scratch. Provides the same functionality of PicoBoard

Nunchucks for Atari

Adapter board for playing Atari games with a Nunchuck controller. Based on a PIC micro.

Nunchuck in MSX

Nunchuck Adapter for MSX computers using bitbanged I2C directly on the Joystick port

Projects I Like & Follow

The 8-key macro pad with screen isn’t just another macro pad — it's a visual, scriptable, dynamic control deck you build and own.

8‑Key Macro pad with 3.5 inch LCD

shu-yang SHU YANG

A compact and rugged LoRa repeater designed for long-range communication and 5+ years of off-grid operation using only alkaline batteries.

LoRaTube

bertrand-selva Bertrand Selva

Using capacitive sensing to measure the oscillation of a candle flame and converting it to a 1 Hz clock

Deriving 1 Hz from Candle Flame Oscillations

Despite its simplicity, this Clock is fully functional, highly adjustable, and has the option of automatically setting the time via the Int

How to make Simplest ever Oscilloscope Clock

mircemk mircemk

Answer the code within 1 second

1 hertz morse code game

ivoidwarranties I_void(warranties)

Want to be nagged to finish projects? This will do the job

A Germanium 1 Hz round tuit

ken-yap Ken Yap

Ham Radio foxhunt transmitter

Ham Radio foxhunt transmitter

jim-matthews Jim Matthews

A metronome that beats at almost, but never quite exactly, 60 beats per minute.

Metronalmost

mike-coats Mike Coats

Super Simple, High-Speed ROM Emulator for Raspberry Pi Pico 2 (RP2350). Includes clock/reset/UART-USB

Pico2ROMEmu: Pico2(RP2350) ROM emulator

with-z80-cpm-or-fuzix With Z80 CP/M or FUZIX

This is a real time clock for a Commodore VIC-20 (and likely C64) that communicates over the serial (IEC) port.

VIC-20 RTC

This is one of three siblings, featuring the RP2350.

P2 - Aluminum Retro Gaming Handheld RP2350

Putting a non-functioning barebones keyboard back to work

Reverse engineering a old school keyboard

A minimally invasive 512 KB paged memory expansion for the TRS-80 Model 1 and III

X-MEM/80 for the TRS-80

michael-wessel Michael Wessel

Cook your hot dogs and test your LEDs at the same time with this convienent, safe-ish LED tester!

100% "Safe" 120VAC LED tester

ian-dunn Ian Dunn

This DIY HF antenna preselector drastically improves the listening experience on your shortwave radio, especially with a long wire antenna.

Build a Cheap HF Preselector - Antenna Tuner

mircemk mircemk

Just a standard 1Hz clock :)

1 PPS Clock (Pixel Per Second)

michael-murillo Michael Murillo

Easy-to-build VFO (Variable Frequency Oscillator) that features a clear, touch-enabled circular display with retro-style virtual scales.

Build simple Retro Style VFO

mircemk mircemk

This project successfully transforms a vintage TV into a functional and stylish retro clock.

How to Make a Digital Clock on a Vintage B&W TV

mircemk mircemk

View all

Bits

Ken Yap wrote 07/17/2025 at 09:23

Thanks for liking #A Germanium 1 Hz round tuit All the best for your #Valvano Clock too.

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Ken Yap wrote 08/10/2024 at 04:40

Thanks for liking #Putting 50 year old Motorola amplifier ICs to work !

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Michael Gardi wrote 02/10/2024 at 10:16

Thanks for liking my Commodore CHESSmate Reproduction project. You have some great projects! Obviously your CHESSmate is especially interesting to me. Mike

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Reinaldo de Sales Flamino wrote 11/22/2022 at 22:12

Salve Mestre, dá uma olhada nesse projeto. Bem legal.

RetroVGA - Raspbery Pico multi retro computer | Hackaday.io

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danjovic wrote 11/23/2022 at 00:10

Salve Flames! Esse projeto é bem da hora mesmo!

Grande abraço!!!

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Ken Yap wrote 11/18/2022 at 02:33

Thanks for liking #Restoring a Beckman neon display clock !

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RunnerPack wrote 10/20/2022 at 14:54

Just based on the other projects you follow – let alone your own excellent projects – I'm honored that you would follow my humble keyboard hack! Thanks!

I also echo tyler's comment below about your tag-line.

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danjovic wrote 10/21/2022 at 21:06

You welcome!! And thank you for liking my projects :)

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ty wrote 03/21/2022 at 22:34

reenignE esreveR. That's gold.

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Michael Gardi wrote 09/17/2021 at 22:48

Thanks for your interest in my 2:5 Scale KENBAK-1 Personal Computer Reproduction and Sol-20 Reproduction projects.

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Ken Yap wrote 09/10/2021 at 23:02

Thanks for liking #89C52 clock board !

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Igor wrote 08/31/2021 at 14:42

Thank you for liking my #CRISS CP/M 8-bit Homebrew DIY Computer (AVR based) project!

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Ken Yap wrote 08/30/2021 at 10:16

Thanks, cool cat @danjovic for liking #6 segments suffice and #TTL binary clock !

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agp.cooper wrote 07/07/2021 at 04:30

Hi , thanks for following some of my projects. I think I am starting to "get it" with CP/M. Version 3 should let me compile C on board. Regards AlanX

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Michael Gardi wrote 02/12/2021 at 16:17

Thank you for your interest in my 2:3 Scale VT100 Terminal Reproduction project.

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kristina panos wrote 01/15/2021 at 20:43

Hello again and thank you for liking my #how I make masks project! :)

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kristina panos wrote 01/10/2021 at 01:30

Hello and thank you for liking my #practice backpack project!

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Mitsuru Yamada wrote 12/09/2020 at 01:15

Thank you for linking my #6802 Serial Terminal !

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Ken Yap wrote 10/03/2020 at 11:39

Thanks for liking #8042 clock !

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danjovic wrote 10/03/2020 at 20:30

You welcome! Nice to see the chip repurposed.

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Dr. Cockroach wrote 07/06/2020 at 11:38

Good morning once again and thank you for liking my #LLTP - Light Logic Transistorless Processor

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Dr. Cockroach wrote 03/06/2020 at 11:53

Good morning and once again, thanks for the like, this time for #Shortwave Crystal Radio - A blast from my past.

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roelh wrote 01/29/2020 at 12:46

Hi Danjovic, thanks for liking the #Kobold K2 - RISC TTL Computer !

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