I recently bought an Arduino pH sensor kit for measuring pH value of my hydroponic setup, it cheap but has very little information/document on how to use it, so I decided to figure it out myself on how it works and how to use it. Continue reading "Measure pH with a low-cost Arduino pH sensor board"
Month: November 2019
Build an ESP32 Web Server and IR Remote
My TV remote control is corroded by leaking battery and no longer working reliably, so I decided to build my own TV remote control with an ESP32 that running as a web server and IR remote control so that I can uses my iPhone to interactive with it via web browser. Continue reading "Build an ESP32 Web Server and IR Remote"
Mount a hard disk to Raspberry Pi as root file system
For past 3 years this web site was running on a Raspberry Pi with a 16GB SD card. I have a couple of old hard disks with me, so I recently decided to replace the SD card of this web site's Raspberry Pi with a hard disk. Continue reading "Mount a hard disk to Raspberry Pi as root file system"