Author Archives: Ondřej Karas

IQRF Wireless Challenge II Finals

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conntest_podkladIQRF Wireless Challenge II, the contest for the best wireless applications, revealed its winners. There were 47 contestants from 14 countries registered in the contest. The final round was an interactive exhibition of the top ten projects. It took placeat the Faculty of Electrical Engineering of Czech Technical University in Prague on May 27, 2016. The best applications were designed by participants from the Czech Republic, Hungary and Romania.

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Remote controller with PCA9535 V2.0

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IMG_9431miniTwo years ago I published post about Remote controller with PCA9535. This device was not without some disadvantages, of course. Some of them: not accurate board outline, IQRF module orientation, through-hole push buttons. Now I have finished new version with some improvements, which replaces disadvantages mentioned above.

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Simple wireless traffic lights

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Simple wireless traffic lights

One of site members, Martin Strouhal, wrote: Today I prepared for you example, how to use DDC with relays connected to DK-EVAL. One of my friends asked me for a sample how relays are working. I choose for this demonstration connect to relay LED diode and simulating e.g. street light. However, my fantasy was working farther and I’ve got an idea when I was looking for LED diode and by the way found RGB LED too. It was good change how to show simulated traffic lights for walkers and demonstrate controlling of color states by switching of different branches instead of simple switching on/off.

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IQRF SPI library for master MCU

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swThis article describes my new SPI library for master MCU. It is based on library published in startup package. I made some changes. At the first, I removed all PIC MCU related lines of code, because of universality of library. Next, I encapsulated all global variables related to SPI state machine to one structure. There are published two versions of library – for AVR-GCC and GCC compiler for ARM version 4.9.3.

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