Best way to stream data fast to a Nano

Projects General Guidance
1

I am still getting up to speed on Arduinos as I am coming from the PIC world. I have some Nanos that I have been using for small projects, but now I want to try to push it some.

The first thing I want to do is Livestream it servo values for a 3-axis skull setup. So in real-time I would like to be passing over pitch/yaw/roll.

I am currently collecting the data in a Python script that will reduce the 250Hz of data to something closer to 20Hz. I then want to stream that across to the Nano to adjust the servos. The values will be 3 signed into, so that will add up fast when trying to stream real-time. Any suggestions on how to do this fast enough?

Secondly, once I am happy with my setup, I plan to record motions and then play them back later. You guys think an external SDcard module would be the way to go there?

2

20Hz should be no problem. You could even transmit that in a human-readable format so that you can inspect the data for yourself.

Start by reading Serial Input Basics and then count up how many characters you need to send in each message and how many messages per second.

Recording motions will not be difficult. Particularly if you have a fixed sample rate so you can play it back at that same rate.

3

At 16MHz, the Arduino should handle it fine, it is just the comma I worry about.

I do want to use a fixed data rate since the head motions will be tied to audio, so that will actually be aomewhat critical to keep that tight.

I am not concerned with the recording of the data (since I can do that on my PC in Python), but the best way to store and read it out quick enough so I can replay it in sync with an audio source (probably an mp3 add on).

Thanks for the link, I'll check it out.

4

I regularly communicate between my Arduinos at 500,000 baud using the 3rd example in Serial Input Basics. If your individual messages are shorter than 64 bytes then a complete message can be received in the background and attended to at your convenience.

...R

5

Robin2:
I regularly communicate between my Arduinos at 500,000 baud using the 3rd example in Serial Input Basics. If your individual messages are shorter than 64 bytes then a complete message can be received in the background and attended to at your convenience.

...R

We're you using the serial interface through the USB connection?

6

toozie21:
We're you using the serial interface through the USB connection?

For some projects.

Also I have projects that have serial communication between Arduinos without a PC - for example a Mega as master and Atmega 328s as slaves.

...R

7

500k baud through the interface? That would be more than enough. I think I will be sending about 12ish Bytes each time.