Adrian’s electronics blog

In this example I will show you how to multiplex a 7 segment LED display from a microcontroller such as an Arduino without placing too much load on the microcontroller pins as I have seen in some other examples. Quite a few tutorials I’ve seen are not really good practice for electronics design – some […]

Just a quick one today – I obtained a lot of orange 0.4″ retro LED modules so I thought seem as I have a few blank PCB’s left over from my previous YouTube counter display I thought I’d make another. This one was for test purposes to see what else I could use a 4 […]

If you have an unknown 7 segment LED display and you want to use it in your project, you need to determine its pinout. The pinout is the arrangement of pins that connect the display to the power supply and the controller. There are different types of 7 segment displays, such as common anode, common […]

I recently acquired a few scrap Seltek (now Avaya) wallboards from an insurance company’s call centre, and they turned out to be quite intriguing. Among the items were three call waiting monitors and a SDX ACD scrolling message display, also known as a “wallboard.” What caught my attention were the separate LED modules in the […]

On one of my very old computers I had one of those LCDmodkit PC status screens that consisted of a 20×4 LCD housed in a 5.25″ bay and was interfaced to an internal USB header on the motherboard via a USB2LCD controller. As there are no Microsoft certified drivers available for this device it was […]

Here I have a couple of defective enterprise grade access points that were decommissioned as they were suspected as faulty and were out of warranty. They are manufactured by Xirrus and are meant for outdoor high capacity Wi-Fi for public locations e.g. Stadiums, festivals etc. I thought I’d pull one apart and see what was […]

I bought two lots of faulty laptops and tablets from eBay with the intention of repairing and reselling them as mentioned in my previous blog posts. Without repeating myself this was largely a success more so with the laptops and not so much with the tablets. The problem with the tablets not being profitable is […]

I bought several laptops and netbooks off eBay with a view to refurbish and sell them; I got around 7 laptops and 9 tablets and netbooks for just £100. One of the netbooks was an Asus X205T that had it’s eMMC drive encrypted with bitlocker amongst other issues such as a dead battery and faulty […]