Latest Posts

• Feb 25, 2026 Reverse Engineering Daikin IR Codes for Home Assistant

  An evening spent trying to control Daikin ceiling cassette air conditioners from Home Assistant using a Broadlink RM4 Mini IR blaster. What started as “surely someone has done this” turned into a full reverse engineering session of the DAIKIN200 IR protocol, programmatic code generation, and ultimately hitting a hardware limitation of the Broadlink itself.

• Jan 19, 2026 Hong Kong Pollution Data - 2025 Update

  It’s been over 8 years since my original analysis of Hong Kong pollution data. Time for an update! Has air quality improved? What trends can we observe now with almost 27 years of data (1998-2025)?

• Aug 2, 2020 PF and SSHGuard on Mac OS X

  Quick memo about setting up PF and SSHGuard on Mac OS X, all tested on Catalina (10.15.6) in August 2020.

• Nov 4, 2018 Hong Kong pollution data

  Pollution is a major concern in Hong Kong. How bad is it? Compared to say 5 years ago? 10 years ago? It is surprisingly difficult to find simple long term charts, despite pollution data being seemingly readily available in a few places on the web.

• Oct 30, 2018 Scraping Hong Kong pollution data - Part 2

  Pollution is a major concern in Hong Kong. How bad is it? Compared to say 5 years ago? 10 years ago? It is surprisingly difficult to find simple long term charts, despite pollution data being seemingly readily available in a few places on the web.