Blog

Ethernet controlled 5.1 speakers

Wednesday, May 4, 2011 by Martin Hubáček AVR

I use the Genius SW-HF 5.1 5005 speakers with my laptop. The speakers are good for my needs but also have some drawbacks. The woofer is making really really silent but annoying 50Hz hummm sound when is in standby mode and as I discovered last week, the speakers are eating a lot of power even in the stand-by mode, about 40W ! The transformer inside is so hot in stand-by that I cannot hold my hand on it.

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Valentine blinking heart

Sunday, Feb 13, 2011 by Martin Hubáček AVR

I saw a similar project on the internet and gained some inspiration and confidence, that this year I have to make some electronic gift. Very nice design. Touch resistive button. But I had no SMD transistors so I’ve made everything easier.

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Tic-tac sized usb avr programmer

Sunday, Jan 30, 2011 by Martin Hubáček AVR

This is my board layout for USBasp programmer. On the fischl programmer homepage is a lot of designs, different MCU types and package sizes of processors. But nothing that I would like. I wanted really small size but with the same features. I used the original schematics from Fischl and created new layout with some SMD parts.

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Evalbot I2C & Nunchuk lib

Sunday, Jan 30, 2011

Library for Evalbot with LM3S9B92 ARM Cortex-M3 processor. I wanted to use I2CS1 module and set multiplex to work on pins PJ0 & PJ1 which are perfectly accessible in standard 2.45mm pitch. But I had no luck to initialize them so I tried to connect Wii Nunchuk to I2S0 module and pins PB2 & PB3. These pins are connected to audio codec so you have to be careful when using nunchuk and audio codec at the same time.

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Evalbot LED blink

Sunday, Jan 30, 2011 by Martin Hubáček ARM, Evalbot

Today arrived Evalbot kit from Texas Instruments so I built it together and tried hello world application. I’m using arm-none-eabi GCC compiler so if you don’t like IAR compiler, you can start your project from my sample.

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EvalBot peripherals code

Sunday, Jan 30, 2011 by Martin Hubáček ARM, Evalbot

I put together all the interesting examples from Stellarisware and ported them to work together on Evalbot and CooCox CoIDE.

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Simple DC/DC converter module

Monday, Jan 24, 2011 by Martin Hubáček electronics

This simple DC/DC step-down converter is perfect for breadboard design or replacement of 78xx stabilizers. It’s not so powerful but it can give about 350mA and even if you apply higher input woltage, it doesn’t get much hot like the 78xx ones.

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VuUSB

Sunday, Jan 16, 2011 by Martin Hubáček AVR

Nothing special. ATmega8 just listens on USB. Lighting of every LED depends entirely od PC.

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8×8 RG LED module

Friday, Jan 14, 2011 by Martin Hubáček AVR

HuBik is 8 by 8 red-green LED matrix. It’s powered by coin-cell battery and controlled by ATmega32.

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