Photon to Arduino Serial Communication over USB?

[wgbartley]

@ben_d

would it be possible to directly connect the USB connection from the Photon to the Arduino?

Unfortunately, no. I'm not a USB spec expert by any stretch of the imagination, but I think USB follows a sort of master-slave (host-client) relationship. I do not think either the Arduino or the Photon have the ability to function as a master or host.

@ben_d

unfortunately all the GPIO pins are being used for other things on the Arduino

If you could free up a couple of those GPIO pins (or the TX/RX ones), you could easily chat with the Photon via serial. Can you use something like a shift-out register to free up some pins on the Arduino?

@ben_d

(there's a nice tutorial around here for that...)

I'm familiar with that one! Thanks for the kind words!

Spark (3.3v) to Arduino (5v) Serial Communication

This is in reference to another thread, but I got a Spark talking via serial to my Arduino Uno using a logic level converter (I actually used one from eBay, but it works the same). The goal of this little test is to see if I could write from the Spark to the Arduino and listen for any serial data that the Arduino might generate. It’s pretty simple and straightforward. Since my test Arduino is an Uno, I’m limited to SoftwareSerial, so I had to scale down the baud rate. I will eventually tap t…