Multimeters & Continuity mode…

This is just a quick post to share something that I learnt only very recently, whilst chatting with a wise Sensei, about how the continuity mode of most multimeters actually works. Continuity mode is perhaps one of the most used modes on a multimeter for many people. Simple, it lets you test for electrical continity […]

A Giant 555…

I’ve not actually written anything here for quite some time (it turns out that doing a part-time PhD really eats into your electronics project time… Who’d’ve thought!); so I thought I’d take advantage of the current isolation and a few days off over the Bank Holiday, to catch-up with some blogging… The venerable NE555 timer […]

UNI-T UT802 – First Impressions…

It’s been a while since I’ve written much here – but I have just made a short video on the UNI-T UT802 bench-top multimeter that I bought recently. As I say in the video; I plan to make a more detailed video doing some comparative measurements – to see where this unit ranks alongside other […]

Arduino I2C with the MCP9808 Temperature Sensor

[latexpage]The Microchip MCP9808 is a high precision temperature sensor with an I2C interface – making it easy to interface with microcontroller or embedded Linux electronics. The chip has a very small form-factor: available as either an 8-pin DFN package – or an 8-pin MSOP package. For hobbiest purposes DFN is almost impossible to use due […]


The MintyBoost is an open-source, small form-factor, USB charger which runs on AA batteries – and lets you charge your mobile phone, tablet or other USB device, without the need for mains power or a computer.  It was designed by one of the leading proponents of the open-source hardware movement, LadyAda – aka MIT Engineering […]

Getting started with BeagleBone

I’ve just picked up a BeagleBone… BeagleBone is a small, low(ish) cost, open-source Linux computer on a  board – using an ARM Cortex-A8 processor running at 720 MHz, with 256 MB of RAM.  Unlike an Arduino – this is a fully-fledged computer. This makes it extremely powerful – and makes it a nice device to play with, to […]

555 Astable Oscillator Video

Here’s a video that I made to accompany my previous blog post…

555 Astable Oscillator

In my last few posts I’ve been writing about using an Arduino to generate waveforms. Part 3 of that series is still in the works (I’ve not forgotten, honestly!) – but this time I want to write about an alternative way to make a simple waveform: using good old analogue electronics, without the need for […]