We thought that connecting an Arduino to a Raspberry Pi was overkill ... [Jan] uses the PHP serial class to communicate between the RPi and Arduino (dead link; Internet Archive).

Not only does the Raspberry Pi sport more I/O pins than the Arduino, but it has a good range of communication ports, too. You can effortlessly add internet connectivity to your Raspberry Pi using ...

A Raspberry Pi with a camera is nothing new ... You can connect via USB, serial, SPI, or I2C. Internally, the camera processes at 60 frames per second and it can remember seven signatures internally.

and even serve as a serial monitor where you can print messages. If you're more interested in programming with C/C++, there's an 88-page guide you can refer to. The Arduino Nano and Raspberry Pi ...

CAN, a Raspberry Pi RP2350-powered CAN development board with onboard XL2515 CAN Bus controller and a SIT65HVD230 ...