As I wrote a sketch for my stepper motor controlled by Blynk, I found the push button caused stepper motor did 2 revolutions for each push.

Using ESP8266-01 module as a shield to Arduino Uno is hard to establish. I took a week to google around to get and fix several issues for this arrangement.

In this article, Arduino Uno will use ESP8266 as a shield and communicate between this devices using SoftwareSerial at uncommon pin D2 and D3. Common serial communication pin D0 and D1 will be left as debugger or for console. I will use Blynk sketch as for the programming.

Since Arduino 1.6, the libraries path not only available in Arduino default path installed (\Program Files (x86)\Arduino\libraries), there is another path to be considered.

Yesterday, I got an error caused by same multiple installed libraries but different path name. Between LiquidCrystal library and NewLiquidCrystal library.

I think this is a thinnest Arduino currently available as it can fit in a AA battery enclosure. Read more and get the idea.

It took about few weeks for to understand (hard way) the application of Interrupt in Ethernet Shield. There is no complete explanation or manual in the internet could be found. Anybody (including me) who were trying to search how to write the arduino sketch and make interrupt works will find a partial explanation in forum.

As I discovered the way how to make interrupt work in Ethenet Sheild, I think people out there maybe has the same difficulty like me. So, I try my best to explain it all (hopefully) and make everybody understand.