the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections ...

This is a simple example of what you can do with a logic analyzer and a Raspberry Pi with a 40-pin header. Let’s ramp it up! On the Pi board alone, I2C is used in a few different places ...