Arduino to Arduino over the internet

Projects General Guidance
1

Hello All,

I am wondering if it is possible to read a sensor from one arduino and then control another arduino over the internet? For example I want to read a temp sensor with one arduino and then use that data to control a servo connected to another arduino at a different location. I have seen some tutorials using an ethernet shield, but couldn't find any specifically using one arduino to sense and another arduino to control. Any information pertaining to this topic would be greatly appreciated.

Thanks

2

Absolutely possible. Look at the Ethernet library for starters, the WebClient, WebServer, and UDP examples.

3

I would use UDP.
The UDP messages could get lost, so you should have some kind of timeout. Also if the Arduino with the sensor gets disconnected, you should detect that with the timeout. Or you can send the current time with the sensor data in a single package.

4

Caltoa:
I would use UDP.

I'd be interested to know your reasoning. I can't see any advantages, and you'd be losing the reliability of TCP. HTTP seems like a natural choice here.