projects

As shown before, much of the blockchain-powered Helium LoRaWAN network is fake, especially in Hong Kong. Scammers claim their hotspots are installed in these locations to earn HNT while in reality they are probably somewhere in a garage, not providing

How it seems that where I happen to live, none of this network is real.. The Helium network has been growing extremely fast. I had checked coverage on my island of Lantau, Hong Kong in early Dec 2021 and only

With my indoor gateway, a basic Dragino LPS8, i was able to receive packets from over 500 meters distance, with the standard indoor antenna and the gateway positioned near a window about 10m above ground. I read on the TTN

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