CuVoodoo #011 – believe in what I do, not what I say



testing the accuracy of a power supply:
It was time to get a decent power supply, and so I found the EA-PS 2084-03B. It fulfilled all my criteria: good quality, silent, wide voltage range, and most importantly with PC connectivity. But somehow the reading on the LCD does not match what is output. So I implemented a program to remotely control and monitor this power supply, and with a PC connected UT61E multimeter I can compare what is set to what is output. This way I can measure the power supply's accuracy.

documentation source files watch on other devices (youtube)

recipe:


Published: 2015-06-08 by King Kévin

CuVoodoo #010 – manipulating laundry maids



reversing washing machine payment cards:
To use the washing machines in my apartment complex you need to pay using a rechargeable contact card. I was curious to find out how it works. It turns out it's an I²C EEPROM in a card. By recording the communication between the card and the machine I figured out where and how the credit value is stored. Now I can read and write the value on cards using a Raspberry Pi or simple micro-controller, but also program my own cards to work with the machines.

documentation source files watch on other devices (youtube)

recipe:


Published: 2015-05-07 by King Kévin

CuVoodoo #009 – taming glouttonous lions



building an electronic cat repeller to guard the fridge:
My sneaky cat can open all doors, even the fridge door. No meat is safe any more. To prevent that I built a cat repeller using an Atmel ATmega328P Arduino Nano 3.0 board. An HC-SR501 PIR motion detector checks if the cat is nearby. Then an E18-D80NK range detector verifies if the cat is in front of the fridge. If this is the case a ~24 kHz PWM signal will generate an ultrasound using a piezoelectric diaphragm, encouraging the cat to leave the premisses. If it still opens the fridge, a human audible alarm will sound until it is closed.

documentation source files watch on other devices (youtube)


Published: 2015-04-07 by King Kévin

CuVoodoo #006 – connect a bathroom scale to the computer



I found out the weight measured by a Korona KFW-55 bathroom scale is encoded using PWM. Using a micro-controlled I can interpret this value and send it to a computer over USB and bluetooth.

documentation source files watch on other devices (youtube)

about strain gauges:

  • a short video about strain gauges: nerdkits
  • more details about how different strain gauges: stackexchange

similar projects:


Published: 2015-01-29 by King Kévin

CuVoodoo #005 – MegaCode gate radio control receiver reverse engineering



MegaCode is a system provided by Linear LLC for controlling gates. This time I looked a the receiver. With my firmware it is possible to efficiently record the individual codes of other remote controls.

documentation source files watch on other devices (youtube)

additional links:


Published: 2014-12-29 by King Kévin

CuVoodoo #004 – MegaCode gate radio control transmitter reverse engineering



MegaCode is a system provided by Linear LLC for controlling gates. Using software defined radio I could record and decode the radio transmission of the remote. And thanks to my firmware this can be re-transmitted. With it is is possible to clone MegaCode remote controls.

documentation source files watch on other devices (youtube)

additional links:


Published: 2014-12-29 by King Kévin