A simple compass, using the HMC5883L chip, on a breadboard with an Arduino Nano and an OLED screen. Compass connection is over I2C, the screen uses SPI. I decided not to use a library for the HMC5883L but keep it

I remember about 20 years ago one of my first electronics projects was a light organ, with light spots of 220V; that sounds quite dangerous in hindsight. I built a 21st century version of that using the modest DSP capability

This project is inspired by my friends at DimSumLabs who created a web server to control the lab’s RGB LED lights, using the ESP8266 wifi module and NodeMCU to program it. I made a smaller version, using the familiar Arduino IDE with an

The SIM800 module is great for making a simple phone and listening to the radio, but i noticed it also has a DTMF decoder onboard which allows us to control our Arduino remotely! DTMF are the ‘touchtone’ signals you can send over the