Dr. Monk's DIY Electronics Blog

This project uses and ESP32 Lite board (programmed with the Arduino) to BLE scan for nearby devices and allow a door to be unlocked.

There are a lot of options when it comes to using your favourite microcontroller (be it an Arduino, Pico, ESP32 or micro:bit) to switch something on and off.

[Part 1] [Part 2] [Code and Design Files] After some promising results with the PCB loop antenna, in this post, I'm starting to look at the audio output.

[Part 1] [Part 3] [Code and Design Files] In the first part of this series, I looked at the overall requirements for the project.

[Part 2] [Part 3] [Code and Design Files] In this series of blog posts, I am going to document my journey (which I am about to start) in designing a FM Radio receiver for which I have the very specific requirement of being usable by my brother, who suffer…

A recent question for me from a reader of my ESP32 book (thanks Richard) was: how do I find out which pin the built-in LED (if there is one) is connected to?

TLDR; A little bit, yes, but it probably doesn't matter.

Jacdac is a modular prototyping/educational electronics system and protocol.

I've had several requests, over the years, from readers of my books for me to write a book on the ESP32.

I'm currently in the final stages of a new book 'Programming the ESP32' and while browsing the MicroPython documentation for the ESP32, I came across a section describing setting the output current of an ESP32 GPIO pin.

After some inconsistent and unreliable results reading an analog input from an ESP32 board, I decided to get all scientific and do some experimenting with an ESP32, a Raspberry Pi Pico and an Arduino Uno R3.

I was lucky enough to get hold of a pre-release Raspberry Pi 5.

In the fourth part of this series of posts, we'll take a look at making a battery extracted from an e-cig safe to use in your products.

MonkMakes Press Publishes Getting Started Guide to the Software Industry August 10, 2023.

DANGER: There is a really good chance that the battery is still holding quite a lot of energy.

I seem to be inadvertently gaining a new hobby.

I went for a lunch-time walk with the intention to look out for a discarded 'disposable' e-cigarette.

I have a project in progress that is the third generation of my Hen House Door project.

The Pico W is a fantastic little device, but the examples I have found for serving web pages from it were all too low-level for my taste.

We were given a toy kitchen for our grandchild to use.

The BBC GPIO connection rings (labelled 0, 1 and 2) of a micro:bit can all be used as analog inputs.

When I worked in software, I was an early adopter of agile software development (eXtreme Programming) and so have always loved unit tests and TDD.

Part 1 Part 2 We finally had a chance for the household to go ahead and make some shields.

In part 1 of this post I looked at laser-cutting the plastic band.

This blog documents my efforts to make protective face masks using a low cost K40 laser cutter using Kitroniks visor design.