Over the years I’ve built a few dust sensor systems (‘PM2.5’) with SHARP and SHINYEI sensors, but calibration was always a headache as they have analog output. Earlier this year (2019) i looked into the current sensor technology again, and
This ESP8266-based project runs a simple web server with 1 page to control an 8×8 LED monochrome matrix. It is powered by USB, and portable, as it uses the WiFiManager library to connect to any available wifi network. It allows
This project was designed for 2 workshops i gave at Sonar Hong Kong, as an introduction to Arduino. It uses a standard Arduino UNO to build an 8-step 3-channel sequencer, connected to a custom PCB with an Arduino-based drum chip that
My friend Fatima of Little Egret Studio was interested to monitor the temperature of her pottery kiln, a SKUTT KM822. We came up with a system that uses the kiln’s built-in K-type thermocouple, and the Blynk app on any phone/tablet to
A good project to get the kids up in the morning: play a random song of their favourites list. This Arduino based alarm clock uses an MP3 shield with SD card, an OLED display, and a Real Time Clock module
Kids love calculators so i made an Arduino based calculator with a generic 4×4 keypad that uses 8 digital pins. It comes with a sticker, so it was easy to attach it to a plywood laser cut box. The only
The DP30V5A is a cheap digital power supply with constant voltage and constant current features, so i was inspired by this video to build my own bench power supply. The only thing i had to hack to put it into a
Combining various sources of code, i built a cheap web camera that sends an updated image to a web server every 2 minutes. It is based on the ESP8266 wifi module, programmed with the Arduino IDE, and a serial camera (TTL level)
My son was super excited with his junior foosball from Shenzhen. It was easy enough to assemble, and worked well except for the plastic scoreboard. An excellent opportunity for an electronics project! Actually the electronics are fairly simple: an Arduino Nano an
This box shows the time (NTP sync) and a few data feeds of my home monitoring system. It uses a 32×16 LED matrix driven by an Arduino Nano, and ESP8266 Wifi module (NodeMCU v1). I put it in a laser