High AC mains voltage

My house is second to the power supply transformer and I have been observing some pretty high AC voltage levels. I previously had a really cheap multimeter and thought that the readings are off because of its bad quality. Never the less, I was getting the same voltage readouts with my early house power monitor/logger…

Sensing Shield #1 in action

I have installed the first sensing shield on an Arduino Uno near my house’s breakers box. I finally got a 9V AC/AC transformer so I wanted to monitor my voltage, power factor and effective power usage in my house. I managed to squeeze in a power supply for the Arduino, the 9V AC/AC transformer and…

RFM12B and Arduino Ethernet with WizNet5100 chip

I have successfully managed to get my Arduino Ethernet board based on WizNet5100 chip to work with the Sensing Shield‘s RFM12B. The Arduino Ethenet (don’t mix it with an Arduino Ethernet shield, this one is a complete Arduino+Ethertnet on one board) has addressed the nasty WizNet 5100 bug that prevents other SPI devices to be connected…

Arduino shield for energy monitoring

Few weeks ago I decided to teach myself Eagle PCB so I can put my current spaghetti-style solution for heat pump monitoring to some order. That’s just an excuse of course, I was curious how laying out a new PCB works to begin with. Since my current solution is based on the EmonTX, I decided to continue…