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Cube timer with touch pads

Cube timer with touch pads

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

Tom 10/06/2020 projects No Comments Read more

Beehive monitor, with load cells and temperature sensors

Beehive monitor, with load cells and temperature sensors

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),

Tom 23/04/2020 projects 1 Comment Read more

ESP32 with transparent LCD screen over VGA

ESP32 with transparent LCD screen over VGA

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

Tom 10/04/2020 projects No Comments Read more

Upgrading dust sensor to laser (PMSA003)

Upgrading dust sensor to laser (PMSA003)

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

Tom 19/08/2019 projects 3 Comments Read more

8×8 LED mono matrix with ESP8266 web server

8×8 LED mono matrix with ESP8266 web server

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

Tom 08/05/2018 projects 1 Comment Read more

Arduino 8-step drum sequencer (dsp-D8 drum chip)

Arduino 8-step drum sequencer (dsp-D8 drum chip)

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

Tom 21/03/2018 projects No Comments Read more

Blynk thermocouple for pottery kiln (ESP8266)

Blynk thermocouple for pottery kiln (ESP8266)

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

Tom 21/03/2018 projects 20 Comments Read more

Arduino MP3 RTC alarm clock

Arduino MP3 RTC alarm clock

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

Tom 15/11/2017 projects 1 Comment Read more

Arduino calculator with quiz

Arduino calculator with quiz

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

Tom 08/11/2017 projects 4 Comments Read more

DIY bench power supply (DP30V5A)

DIY bench power supply (DP30V5A)

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

Tom 31/10/2017 projects 1 Comment Read more
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tom@cassiopeia.hk
www.cassiopeia.hk

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Recent projects

  • Cube timer with touch pads
  • Beehive monitor, with load cells and temperature sensors
  • ESP32 with transparent LCD screen over VGA
  • Upgrading dust sensor to laser (PMSA003)
  • 8×8 LED mono matrix with ESP8266 web server
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