High Voltage Arduino Pins

Maybe you have also looked at some Arduino circuits posted online and noticed an interesting way in how some circuits handle high input pin voltages. With high I mean anything above the typical Vcc + 0.5 rating given in the ATMega328p datasheet. Lets look at an example, in a previous post I discussed building a […]

Multi-protocol Module for RC Models

A couple of weeks ago I was searching for a cheap brushed flight controller, for a mini quad project, and stumbled upon the Beecore Lite. At 26mm x 26mm this little guy featured a STM32F030 MCU with MPU6050 IMU and a built in RC radio receiver. All this for less than 10 Euro from a […]

Basic RF Signal Generator

When you start to experiment with radio frequency circuits and projects one of the tools that is a must have is a RF signal generator. Sometimes you want to test the response of a filter and need to sweep through a range of frequencies or need to generate a carrier or clock frequency. Having a […]

FPV Racer Build

In recent years the FPV (First Person View) drone racing industry has grown tremendously with tournaments around the world offering up to one million dollars to the fastest pilot! The widespread interest has flooded the market with low cost components that is of decent quality, making it easier and cheaper than ever to get your […]

Attitude estimation using IMU sensors

In this post I want to talk a bit about the use of accelerometer and gyroscope sensors to perform attitude (roll, pitch and yaw) estimations. Systems that perform these kind of tasks are often referred to as AHRS (Attitude and Heading Reference System) and is commonly used where it is important to know the attitude […]

RetroPie Arcade Part 4 – Completing the build

 Part 1, part 2 and part 3 of this build can be found in the links. In this post we will look at how to complete the build now that we have Retropie running on the Raspberry Pi, the screen working and an enclosure to put everything in. Controller The initial planning for this project I included […]

RetroPie Arcade Part 3 – The enclosure

Part 1 and part 2 of this build can be found in links. The size of the enclosure, and the whole system, was completely dictated by the size of the screen I decided to use. The initial idea was to buy cheap portable game systems from eBay, remove whatever was inside and replace with my […]

Getting started with STM32F1

If you are like me, you often find yourself opening some electronic device to see what makes it tick and maybe discover some new magic part. Recently this was the case with some new parts that I bought for my FPV drone and could not help noticing how many of these devices used STM micro-controllers. […]

RetroPie Arcade Part 2 – The screen

Part 1 can be found here. My aim for this project was to fit the largest screen possible that I would consider portable. Just based on availability and the screen sizes of cellphones I decided that 5″ was the size to aim for. For  reasons I cannot remember this did not happen and I settled […]