Category Archives: Gadgets

Loudspeaker enclosure

This document is about a speaker case I was built around a TDA2030A amplifier circuit and a 130mm car speaker set. Preface The story began some years ago, when I’ve bought a TDA2030A DIY Kit as a Fater-child project to build a power amplifier together. The amplifier was build, but it turned out that we… Read More »

Rotary encoders

See video explanation of this article here: Preface Rotary encoders are pretty cool and easy way to interact with our software. However it is not straight forward to achieve trusty operation with it. The problem in the physical characteristics of these devices, that I will explain in this essay. The second most problematic thing is… Read More »

JoyStick Shield

Preface Surfing the eBay I just have seen an interresting Arduino extension board with an analog joystick, and some buttons. This model has ports for connecting other devices, like Nokia LCD screen and RF module. As I have both, and I just built a joystick myself, I decided to try this prototyping extension. The board… Read More »

DIY Mobile Phone – Part 1 – Hardware prototype

I have a cheap SIM900 based module for Arduino. I would like to create a Nokia 5110 like phone from it. Main components I want to build a simple hardware and write a modular software for it, so the phone functions can be extended later on. I want to achieve the following functionality  (what is… Read More »

RaspberryPi power switch

I had a power switch (from Pi Supply), but I didn’t found it useful. In real cases it’s just not work to have the switch and the Pi apart. I also had a case, so I said, why not combining them. I realized, that by soldering the tact switches to the backside of the board… Read More »

Playing with nRF24L01+ RF module

Preface Recently I’ve received an order from China containing lots of cool stuff. One of this is a cheap radio frequency module. I was playing around with this a bit and I’m happy to share my experiments with you.   Kickstart I had lots of trouble staring up the unit. Fortunately there is an Arduino… Read More »