Upgrade firmware for old oZm versions

The old versions based on Debian images can be upgraded to newest based on OpenWRT. The procedure is simple, but be very careful!. 😛 WARNING: All your information will be lost!!! Uncompress and flash the .img.gz file on a microSD. Power off the ozm and remove the power supply. Extract the NanoPI board from ozm (double check that you’ve removed …

Single phase circuits basics

Single-phase alternating current (AC) is a main technology for efficient energy delivery across the world. Among its uses are lighting, low power electric motors or heating. It is characterized by a sinusoidal shape and varies in time so that the same pattern is continuously repeated. This energy system is characterized by a voltage with the following shape: In a similar …