How to connect Arduino and Raspberry Pi 3?

Question

Arduino

Hello ! I am doing a project in which a script with OpenCV is running on Raspberry and I need to establish feedback with Arduino. Connecting via USB is not an option, because. space is very limited, and USB type B takes up a lot of space, and now I have to choose I2C or SPI. Everything is complicated by the fact that everything needs to be done in real time, well, or with a slight delay, but when I tested my script (with I2C) with the smbus library screwed on, it worked for less than a minute, and then crashed with an error I did not understand. It seemed to me that there was not enough speed for data transfer. Please help, maybe give links to some articles.

Answer 1

You can also use UART.

Answer 2

If Raspberry Pi 3 with Bluetooth, then you can buy a module for arduino - 1Mbps is enough?

Answer 3

You can use SPI, for example.