LoRa is a radio technology for low power long range communication, typically kilometers. It is designed for small data packets and uses certain license-free frequency bands: 433, 868, 915-925 MHz depending on your region. It can be used peer-to-peer to
My son has been working hard on his cubing skills, and he showed me some competition videos that use a timing device. I set out to make one, using a ESP32 dev module because i got loads of those, and
I got myself a FlowHive recently in the hope of keeping a colony of bees and producing honey in my village in South Lantau, Hong Kong. While i’m sorting out how to get a colony of local bees (Apis Cerana),
I have quite a collection of old laptops and tablets and except for taking out battery cells (Lipo and 18650s) i have not done much with the other components. The screen was an obvious candidate, but it does not use
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