Electronics hobby blog

18650 batteries are known for it's high energy density, but this comes at a price. In order to protect the battery from overcharging or over-discharging a number of ICs need to be used. Luckily these charge and protector circuit boards are readily available for sale in all shapes and sizes. In this blog post I am going to build a charger that uses such a circuit.

Not only the charger can use protection circuitry, but also the battery itself. When buying the batteries make sure that they are protected. I have bought mine in a Chinese online webshop.

It is easy to mod your 3D printer to become a laser engraver / cutter. All you need is a laser module. The one that I have used had a power of 2500mW, which is enough to engrave and cut thin sheets of plywood.

MicroPython is a programming language that is derived from his big brother Python and is optimised to run on microcontrollers. In this blog we will focus how to get it running on ESP32 with a SSD1306 OLED display.

If you are a Trekkie, then you must remember the door chime that is played when someone wants to enter a quarters. In this blog I will describe how to create such a doorbell using Arduino Nano and some extra modules.

The flat screen TV was just the beginning of a trend to save space on objects that reside in our living room. This idea can also be applied to the tradition of decorating a Christmas tree.

Helping scientific research by mining Gridcoins can be satisfactory. You contribute to various projects by donating your CPU power. In return you get Gridcoins. This mining process uses energy and we want to do this in an economical manner.

Cyclops hotend has two filament inputs and merges them into one output. My Prusa i3 clone already had a Chimera extruder, but I was curious about the single nozzle solution.

Acorn RISC OS requires a mouse and it is very limited in use without it. This post describes in detail how to create a PS/2 Arduino adapter that connects to the 9-pin Mini DIN mouse port

Acorn RISC OS requires a mouse and it is very limited in use without it. This post describes in detail how to create a PS/2 Arduino adapter that connects to the 9-pin Mini DIN mouse port.

I was very fortunate to get this vintage computer from my friend Eric. This Acorn Archimedes A3010 was produced in 1992 by Acorn Computers and was based upon an ARM250 RISC microprocessor. Right away I proceeded to connect the computer to see if it still was in a working condition.