Smart Power Outlet

We had recently moved into a new place, which meant getting the internet up and running could take atleast a couple of weeks, so I had this 4G modem lying around which used to be my primary source of internet access before it became too expensive to afford, however in this time of need I …

Building a Simple Inductance Meter

Software Update Version 1.4B Inductors are mysterious components, and to size a coil to your specific needs is even a bigger mystery. I am sure if you are reading this then you share the same thoughts. How often did you end up in a situation where you have to wind your own coil for may …

Crude Li-ion (18650) Single Cell Charger

Hope you guys are doing great! So I had this decent head lamp which was my only dependable working light and after loosing its battery charger the unit practically was out of order for some time, so the other day I decided to end the misery and design a basic charger for it. It is …

Universal Programmable NiMh Battery Charger

  Roughly around this time last year I first started experimenting with an Arduino based programmable current source, trying to regulate the current from an LM2576 switching regulator and failing miserably in my first attempts. Back then the programmable NiMh charger was just a concept I had come up with when finishing up one of …

Regulated Half Bridge Switching Power Supply Using ATX Transformer

Disclaimer: This circuit is for educational and experimental purposes only, further tests have revealed this circuit and many of its kind available on the internet are unstable and can fail causing injury if proper input fuse protection is not used. The final design uses an unregulated version of the circuit as the IR2153 is not …

Improving and Porting the PID Controlled Current Source Design Over to an ATtiny85

Hope things are going great for you! So apparently the  PID regulated current source using a switching regulator is a pretty popular thing, something that is searched for online quite often, at least that is what the blog stats indicate. In this post I will be taking things one step further, I will be discussing …

Making the PID Controlled Current Source Better

Extensive testing leads to many problems that are not revealed initially, during the time I spent tinkering and tweaking the PID code I was confronted with some problems that had to be addressed in order to make the final code reliable. By the end of this article we'll be improving the code through logical reasoning …

Programmable Switching Current Source Using Arduino as a PID Controller

Hope you guys are doing great! In my last couple of posts concerning the NiMh battery charger I mentioned how I would like to make a programmable universal NiMh battery charger for a number of battery voltages and current levels, I was thinking of a contraption where the user would feed in the current output …

Switching NiMh Battery Charger

Hope you guys are doing great. Ever since I published my first blog post discussing the design and implementation of temperature gradient cut-off ATtiny24 smart charger for NiMh batteries I wasn't fully satisfied with the power or the actual charging circuit, initially I decided to build the charger controller and the power circuit separately since …

Current loop tester and pressure monitor for a 4-20mA (10 bar) analog sensor

  Hope you guys are doing great. This post will discuss the design and implementation of a specialized milli-Amp meter and pressure monitor, the tester is intended to be hooked up like an amp-meter in series with a pressure sensor current loop in order to measure the milli-Amps flowing in the circuit and display the …