Category Archives: Arduino

Arduino Day 2019

Presentation in Hungarian: Arduino függvénykönyvtárak, Aszinkron programozás Example #1 – Object oriented programming, construction, scopes, class vs. instance: Example #2 – Problem: Turn on the lamp with a click, turn off automatically within 3 secs. Timing with delay: Example #3 – Solving the same problem with millis: Example #4 – Problem: Same as before, but… Read More »

Hex Game

For this project I was inspired by Benjamin Heckendorn, where he was building a game for practicing hex numbers. I always wanted to build that, but did not wanted to make my own PCB. Then I came across with the so called LED&KEY board. Actually this is already a 3in1 game, and the binary-game mode… Read More »

Modifying Wemos Relay shield

I generally like the idea behind the Wemos D1 Mini system, but I have to admit, that there is a lot of problem with it. This time I was sorting the issue with the Relay shield. Now the Relay shield is a proper one, the only problem is that it occupies pin D1. Pin D1… Read More »

Fixing Wemos D1 Mini RTC module

I have bought two pieces from the same RTC (Real Time Clock) module for the Wemos D1 Mini (aka. “WIFI D1 MINI Data loggar shield”) from China. The idea here is to keep a time-sensitive smart-thing working even without internet. Is the module faulty? This module utilizes the DS1307 RTC chip, that always requires the… Read More »

New WS2812B LED matrix – Is it damaged?

I have bought two “WS2812B 8×8” LED matrix panels from China for a possible future project. As I wanted to try them out it turned out, that none of them are working. So are they arrived broken? I used a big power supply for powering both the Arduino Nano and the matrix. I have connected… Read More »

DIY USB Pedal device

Sometimes you just need a special USB device for your computer. As your feet are always free, we wanted have a pedal device. The pedal device can act as a keyboard or as a mouse depending on your needs. Just think for the ones experience disabilities. In our special case we wanted a device, that… Read More »

How to design a line following robot

I already have shown how I have made an Arduino controller for my old LEGO robotic kit; and also, how to recognize colors. Now I will form a cool project around these achievements, and build a line following robot. This post focus on two key parts of the build: what is the recommended hardware design… Read More »

DIY Egg Decorating Machine

Goal I have seen some egg painting machines out there, but I found them too complicated to be a DIY project. These are some kind of CNC laves. In my design the pen (aka. tool) is in your hand, so the pen movement not controlled by the machine. The machine only performs the rotation task.… Read More »

Chess clock

Preface Lately I play some chess again, and I was realized, that it will become very boring, if we do not limit the time of the game. So a chess clock is required, but instead of buying one, it seams to be a great DIY project, and we will have a hackabe clock around the… Read More »