The home etched PCB failed, and so did the kitchen sink – ferric chloride does not forgive. Lessons from a bad etching day.
Arduino shield for energy monitoring
My first Eagle PCB project: an Arduino shield that turns the spaghetti heat pump monitoring setup into something orderly, EmonTX based.
Hacking Daikin split type air conditioner into air-to-water type heat pump
How I converted a Daikin split air conditioner into an air-to-water heat pump for heating, cooling and hot domestic water at my house.
Custom defrost algorithm for Daikin heat pump
My Daikin heat pump defrosts on a dumb 45-minute timer, so I built a custom defrost algorithm that only runs when actually needed.