A portable electronic device that I was designing used 2 lipo cells in series for power. i needed and inbuilt charger for these batteries and wanted to use USB since the device i was designing connected to a PC via USB. > Read more
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Many people are tinkering around with RC controls and robotics and trying to install independent sources of power into their projects. Testing devices with these independent power sources often presents some problems for the lab, and especially, the sensitive bench instruments on which we all rely. Ground loops are often a surprise event, and can be costly, in terms of loss of the p > Read more
A PWM output controls the logic FET BUK101-50 (or IRLIZ44N). This FET switches the discharge current through 2 resistors. A 0.1 ohms resistor is used for the current measurement. > Read more
These days USB sticks are available for all kinds of applications, ranging from the storage of data to the measurement of temperature. USB sticks to measure barometric pressure are still quite rare however. > Read more
Transferring up to 24 digital signals using your computer’s USB interface is simple with the multifunction cable described here. You can also sample up to eight analog signals, generate PWM and servo signals and more besides. This article offers a simple protocol for controlling the cable and covers PC programming in the C# language as well. > Read more
When you want to digitize vinyl records with a computer you need either a preamp with RIAA correction or use some kind of correction software. In this project I want to build USB audio interface with RIAA correction.
This stand-alone data logger displays pressure, temperature and humidity readings generated by I²C-bus sensors on an LCD panel, and can run for six to eight weeks on three AA batteries. The stored readings can be read out over USB and plotted on a PC using gnuplot. > Read more