What are serial protocols?

I2C, SPI, and UART are three of the most common protocols for serial data transmission. An overview of these protocols can be found here:

• UART - I2C - SPI - Serial communications #001 video from Electronoobs
• Introduction to Interfaces video from element14

I2C Communication

• TI’s I2C Resistor Sizing Guide
• Online Resistor Calculator
• I2C Communication, part 1: Introduction video
• I2C Communication, part 2: Microchip Code Configurator video
• MPLAB XC8 for Beginners Tutorial 38: Interfacing the TC74 I2C Temperature Sensor video (TC74 Datasheet)

SPI Communication

• SPI Communication, part 1: Introduction video
• SPI Communication, part 2: Configuration with Microchip Code Configurator video
• SPI and Shift Register Tutorial using the Microchip Curiosity board by Qinchen Zha

UART Communication

• MPLAB XC8 for Beginners Tutorial 19: EUSART with MPLAB Code Configurator video
• UART PIC to Argon tutorial by Mykol Reklaitis