Send sensing data from Arduino Uno to Particle Electron

[gusgonnet]

Hi,
I ran a few searches, on Google and on this forum.
On Google (this is the search I ran):

With I2C:

I2C Between Arduinos

With serial:

Serial Communication Between Two Arduino Boards - Iotguider

On this forum (this is the search I ran):

@rickkas7

Communicating with an Arduino

Here’s an example of using serial to communicate between an Arduino (Uno, in this case) and a Photon.

• Photon TX connects to Arduino RX (0) (green wire)
• Photon RX connects to Arduino RX (1) (blue wire)
• Photon GND connects to Arduino GND (black wire)

Remember: RX and TX always cross, and you must have a common GND connection.

I think the most promising one is the post from Rick.
The other two links above, arduino to arduino, can help you get more ideas about what needs to be done.

Good luck with your project and keep asking questions if need be.
Gustavo.
PS: feel free to fine-tune my searches if you need more inspiration material.