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We've gotten used to the GPIO-available functions of Raspberry Pi computers remaining largely the same over the years, which is why it might have flown a little bit under the radar: the Raspberry Pi 4
Raspberry Pi SPI and I2C Tutorial - SparkFun Learn
Hardware and Interfaces Usage
SparkFun I2C/SPI-to-UART Breakout - SC16IS750 - BOB-09981 - SparkFun Electronics
Raspberry Pi connectivity compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+ Onboard SC16IS752 expands 2-ch UART and 8 programmable GPIO
Waveshare Serial Expansion HAT for Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+ via I2C Interface 2-ch UART 8 GPIOs
Arduino Communication Peripherals: UART, I2C and SPI - Latest Open Tech From Seeed
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Setting Up UART Serial Communication between Raspberry Pis
The Raspberry Pi 4 Has More SPI,I2C, UART Ports #piday #raspberrypi @Raspberry_Pi « Adafruit Industries – Makers, hackers, artists, designers and engineers!
I2C - Raspberry Pi, Pico and an Arduino
Raspberry Pi Documentation - Raspberry Pi hardware
Raspberry Pi Compute Module 4 is out: $25 with a new form factor and new connectors
Emulates 24 out of 29 Raspberry Pi GPIO pins Pin compatible I2C, SPI and three UART ports WiFi and Bluetooth (low energy), 10/100 Mbps RJ45 Ethernet
ESP32-Pi a Low Cost Raspberry Pi Alternative Using ESP32