Skip to content

Cassiopeia Ltd

the joy of making stuff

Menu

  • home
  • workshops
  • kids
  • hobby projects
  • 3Dmaps
  • teaching materials
  • about

Month: May 2017

Low cost basic Polargraph

Low cost basic Polargraph

The polargraph is a fascinating vertical plotter, that uses two small motors and gravity to move a pen over a paper, controlled by software on a computer. Actually ‘polargraph’ is the name given to it by a guy who wrote an

TomT 25/05/201708/11/2017 projects 3 Comments Read more

Portable dust sensor (SHARP)

Portable dust sensor (SHARP)

This is an Arduino-based battery powered air quality monitor using the optical SHARP GP2Y1010AU0F dust sensor (or its more recent version the GP2Y1014). It reports values in micrograms per cubic meter, which is also the unit of PM2.5 and PM10. Having

TomT 02/05/201713/06/2017 projects 5 Comments Read more

Contact

tom@cassiopeia.hk
www.cassiopeia.hk

Creative Commons Licence
All content of this website is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Recent projects

  • PIR activated lights for art alley
  • Testing the DFR0580 solar lead-acid battery charger on the bench
  • LoRaWAN river level sensors – battery life
  • The next Helium scam: earning HNT by generating data traffic over low-cost Data-Only Hotspots?
  • Finding real Helium hotspots in Hong Kong (part 2)
Copyright © 2025 Cassiopeia Ltd. All rights reserved. Theme Spacious by ThemeGrill. Powered by: WordPress.