arduino based door opener using an ethernet shield and a relay shield
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This little program allows to trigger a relay on a SeeedStudios relay board (pin 7) when the /openthedoor action is requested on the specific IP.

This code is based on "Web Server" Examples by "David A. Mellis" and "Tom Igoe" (, modified using Florian Le Goff's code and suggestions, and my personnal needs.


You mainly have to change the IPAddress. If you use a different relay setup then you probably should check the const switchOpen.


This code is working with an Arduino Uno Board, an ethernet shield and a 4 Relay Shield from SeeedStudios. In order to see the relays being triggered you need a 9V power supply connected to the Arduino. Check the SeeedStudio wiki for more :