This is just another weekend project. I need a temperature and humidity monitor, instead of buying one from Ikea, I decided to make one with a Sensirion SHT40 sensor and a ATtiny824 MCU.
Continue reading "Build a SHT40-based temperature and humidity monitor"
This is the second part of the two-parts review on Seeed Studio's ph and EC Sensor Kits. In this part, I will take a closer look at EC Sensor Kit and how to measure EC with an Arduino. Continue reading "A review on Seeed Studio pH and EC Sensor Kits – Part 2"
For the past several months, I've been searching for a cost-effective pH and EC sensor kit and I evaluate Seeed Studio's new pH sensor kit and EC sensor kit this week. Continue reading "A review on Seeed Studio pH and EC Sensor Kits – Part 1"
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"
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"
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"
On previous article, I wrote an Arduino sketch for interfacing LCD 5110 display module with Arduino, it is not an Arduino library that can be distributed and share with others yet. In this article, I will explain how to create an Arduino library in 6 easy steps. Continue reading "How to create Arduino Library from Arduino Sketch"
In this article, I will briefly explain on how to create a Python class library to interface with LCD 5110 display module and shares the common APIs with the Arduino LCD5110 library that I previously created. Continue reading "How to use LCD 5110 (PCD 8544) with Raspberry Pi"