Sending Temp. Readings from one Arduino to another Arduino

Projects General Guidance
1

Hi all,

I'm doing a project that involves sending temperature measurements from one Arduino to another. I currently have 4x DS18B20 sensors working and measuring temperatures and I'd like another Arduino to simply receive these values and read them. I currently have 2x Ethernet Shield and 2x Arduino UNO R3. The reason why I'm using the Ethernet shield is so that I could also log the temperature measurements on to an SD card, the shield would also allow me to communicate between the two Arduinos.

I was wondering the best way I could communicate between the two Arduinos, before even sending temperature measurements, I'd like to start it off by sending a simple line of text between the two, just to show that they can communicate. I'm not familiar with networking but from what I could gather online, TCP/IP would be the best method for me to communicate between the two. I wanted to know if anyone could help me out by showing me an example of one Arduino sending text to another or even tell me if there's a better approach to accomplish this task. Thank you for your time.

2

I appreciate that you already have the Ethernet shields but the simplest way to communicate between the two Arduinos is to use a Serial link. No extra hardware required. SD card reader boards are very cheap if you want to log the data.

Sending the data simply involves printing it to a serial interface, probably using SoftwareSerial to leave the hardware serial port free for debugging.

Have a look at Serial input basics - updated for examples of how to receive and parse the data.

3

Hey UKHeliBob,

Thanks for the tip, I'll check that link out and try serial communication instead. I'll let you know if I come into any problems, thanks again. :slight_smile: