James Wood @ edn.com writes: The Design Idea in Figure 1 indicates a low-battery condition in an audio test instrument that is powered by four AA cells. As the instrument was otherwise an all-discrete design, this same approach seemed more in keeping with the spirit of the project...

Controlling your AC loads using wireless power switch is not a new concept. Several commercial products from several vendors can be found on the market such as Xiaomi’s Mi Smart Socket Plug, SAMSUNG’s SmartThings Power Outlet and Sonoff Pow WiFi Switch from ITEAD. Using ESP8266...

Welcome to the 5th post of the “Exploring Eagle CAD ULPs” series. Each post will be about one  useful ULP in Eagle CAD. “ULP” User Language Program is a plain text file which is written in a C­-like syntax and can be used to access the EAGLE data structures and to create a...

Developed by ARM, the latest C/C++ compiler "ARM Compiler 6" had been announced with a safety package in a move to help developers to meet functional safety requirements. ARM Compiler 6 is based on the modern LLVM framework and Clang technology, in close collaboration with...

[Jeija] was playing with some ESP32s and in true hacker fashion, he wondered how far he could pull them apart and still get data flowing. His video answer to that question covers the Friis equation and has a lot of good examples of using the equation, decibels, and even a practical...

Jakub designed and built a programmable electronic load for Arduino, the MightyWatt R3: MightyWatt R3 is a programmable electronic load. That means you can use it for testing batteries, power supplies, fuel cells, solar cells and other sources of electrical power. You can also make...

Lukas Fässler from Soldernerd has been working on revised version of his MPPT Solar charger project: Over the last few weeks I have been quite busy with my MPPT Solar Charger project. I’ve built up a first board and started writing firmware for it. Since the last version was not...

In this video, Circuit Basics walks us through the steps to change the screen rotation on an LCD touchscreen for the Raspberry Pi. Since there are separate drivers for the display and the touchscreen sensors, we need to change the orientation of both. It's pretty simple to do, but a...