Jean-Francois’s blog
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Recent posts
The Sensors Aren’t Alright
Projects
Electronics
Air Quality
A few weeks ago, I automated my air purifiers in the house using Home Assistant, MQTT, and a Python controller to turn the air quality data from the sensors that I have into…
Apr 30, 2026
Jean-François Im
Generalizing TOTP Anagram Counting for Different Bases
Math
Anagrams
Combinatorics
TOTP
OEIS
While working on the submission for A394980 — the count of anagram pairs in halves of TOTP codes — one of my more mathematically inclined friends asked if this was just a…
Apr 12, 2026
Jean-François Im
Palindromes and Anagrams in TOTP Codes
Math
Anagrams
Combinatorics
TOTP
OEIS
This morning, I entered yet another of those six digit TOTP codes to log into an online service. One thing that I always find interesting is when the second half of the code…
Apr 8, 2026
Jean-François Im
The Unreasonable Effectiveness of the Superpowers Claude Plugin
Claude Code
LLMs
Since we’re now in the era of LLM-based code writing, I’ve been working on writing more code using Claude Code. Obviously, one can say “Hey Claude, I want to build a snake…
Mar 25, 2026
Jean-François Im
Building a Simple Air Quality Monitor
Projects
Electronics
Air Quality
During the terrible wildfires that we had in California in 2020, it was possible to know how good or bad the outside air quality was through PurpleAir’s excellent sensor…
May 8, 2021
Jean-François Im
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