hardware

Test of 5 AC-DC PSUs cheaper than $1.5

I need  220AC to 5V PSU for exhaust fan controller, the trickiest part – it should be as small as possible. The main load is LEDs, same time supplied voltage should be clean enough for analog to digital conversions doing by attiny85. So I bought and test 6 different PSU. Because of seller mistake one […]

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Repairing of kitchenaid phase control board

It’s a story how I spent thee days troubleshooting 9 elements circuit when 7 of them are passive. I didn’t found what’s wrong, but fixed it. Foreword: I have  control board marked as W10354309, it’s European 220V model of phase regulator. I don’t really understand the rules how kitchenaid marks their parts, because I found […]

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Lenovo battery hack and whitelist at the same time

Recently I’ve got x230 laptop and have a plan to change buggy Intel Centrino 6205 adapter to something like Atheros, also I decided that it’s worth to have ability to use x220 like batteries, just in case. To achieve that, I needed to flash patched firmware for EC controller (thinkpad-ec project) and modified bios (1vyrain […]

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Posted in Hardware, Linux related | 2 Comments »

Unravel unknown thermistor

Recently I made mistake and made PCB for arduino module where connect temperature sensor to A7 PIN. I’ve envisaged that sensor could be analog (diode) or digital. Soon I’ve learned that diode doesn’t provide enough accuracy even for ±5℃ (2mV/℃) and surprise-surprise A7 pin is only analog input so I can’t use DS18B. I had […]

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KIS-3R33 calculator

Half year ago i wanted to get  in car  PSU to charge my smartphone or to power devices like camcoder. I wanted to build powerful  power supply, first i tried to build it on chip NCP3155, but has failed. I lurking around to find another chip and found complete module KIS-3R33 based on MP2307 chip. […]

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STM32 performance test or how fast you can serve input signal

Finally, i decided to try stm32, before i wrote firmwares only for AVR mega family (from now, when i say AVR MCU, i mean AVR mega family MCU), and was scared by tonns of code that you need for simply led blinking on STM32 MCU. Now i can say, that programming of STM32 not so […]

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Pulseview compilation

Half year ago i wanted to make device that can be used to clone ski pass. I thought that ski passes use RFID 125kHz. First i bought itead module RDM6300 but it turned out that it can only read tags, so i bought  EM4095 chip. At this time i also noticed, that most ski passes […]

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Posted in Hardware, Linux related | 3 Comments »

Arduino keyManager

Few months ago i started to developing iron for waxing my snowboard. Last season i bought regular iron and used it, but it can set temperature only in wide range, did not have overheat protection and can melt the base of the board. In university i learned of 8bit avr mcu, but all firmwares that […]

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