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I'm working on a project using a set of different Arduino Nano connected to a Raspberry Pi through USB. Now my question is: "how can I, from the Pi's point of view, differentiate all of those Arduino and associate them with their respective tty?"

I found some part of my answer in this question. The answering guy proposes to manually change the Arduino MODEL_ID when compiling and to use it afterwork to identify the device. The problem is that I don't know how to achieve that.

I tried to edit the boards.txt file to add a new board configuration with custom vid.x and pid.x (why all those 4 different values?) but after selecting my board and uploading, the MODEL_ID still stays the same:

ID_MODEL_FROM_DATABASE=HL-340 USB-Serial adapter
ID_MODEL_ID=7523

Can't I just specify somehow the USB_PID macro to the compiler command line?

  • That question is about Arduino Micro, which has a ATmega32u4 with USB support. Yours has a ATmega328 with separate USB to serial chip. – gre_gor Aug 23 '16 at 17:47
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How to change Arduino Nano MODEL_ID?

The Arduino Nano used a special USB-Serial adapter (FTDI FT232RL). You can change the ID but this requires some special hacking. Please see the provided links.

Cheers!

  • OK I see the problem then. Thanks! Unfortunately, the Arduino Nano that I have are chinese clones and so they use the ch341 USB serial driver, rather than the FTDI one. I keep investigating... – Ulysse Darmet Aug 23 '16 at 21:36
  • BW: Could your sketch on the Arduino Nano identify itself by sending an ID on startup? This would have to be unique for each connected board. – Mikael Patel Aug 23 '16 at 21:44
  • I think this is what I'm going to end with. Because even if I could change the vendor and product ID in the EEPROM, this would make a mess in the drivers that will not be able to recognize my devices anymore. I found an interesting link which propose a simple API to make this as easy as possible :) – Ulysse Darmet Aug 23 '16 at 22:20

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