Using Aarduino and Ethernet shield it is a piece of cake to connect to web, send and receive data without need a PC. This is pretty expensive way of doing this as it require Ethernet shield that has its price. There are another ways to send data to web. Well eventually you will need a PC because whole magic happens here. So Bangon Kali introduces his tutorial on how to post arduino collected sensor data to web page using NodeJS and SerialPort2.