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”
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”
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”
I recently accidentally bought 5 pieces of thermistor, so I tried it out on both of my Arduino and ESP32 modules, and I have surprise findings on both Arduino and enchanted unexpected ESP32’s ADC linearity issue. Continue reading “Using a Thermistor with Arduino and Unexpected ESP32 ADC Non-linearity”
If someone asking you to give him (or her) the key to your home so that this person can come in to your house to inventory what you purchased in exchange for a free service, will you accept it? That basically what Gmail is asking for… Continue reading “How Google Read Your Gmail?”
I wrote a shortest path algorithm about a year ago using Python and later on port it into JavaScript, I recently revisit the algorithm and port it into Golang and compare the performance of three versions on two different hardware platforms. Continue reading “Shortest Path Algorithm Revisit with Golang”
I recently want to install Golang(Go) on my Raspberry Pi for evaluating the performance benefits of Golang, and realised that there is an easy way and there is a better way to install Golang on Rasperry Pi.
Continue reading “Better way to install Golang (Go) on Raspberry Pi”
I wrote about how to control Raspberry Pi GPIO via web browser without using web framework or full blow web server about a year ago, today I’d like to introduce you an easier way to control Raspberry Pi GPIO via browser using node-RED. Continue reading “Control Raspberry Pi GPIO using node-RED”
I recently works on an IoT project which involving of rendering a dashboard using node-RED. I was wondering whether I could build a node-RED inspired dashboard gauge using D3.js JavaScript library, so I built one as a side project. Continue reading “A node-RED inspired D3 Dashboard Gauge”
I recently need to host a Flask web application, and decided to share my experience with this comprehensive guide on how to properly host a Flask web application with Nginx http server and Gunicorn WSGI server. Continue reading “How to properly host Flask application with Nginx and Guincorn”