How Chips Talk: I2C vs SPI vs UART, Explained
Inside every phone, watch, and gadget you own, dozens of chips are in constant conversation over tiny copper wires. They do it in three little languages: UART, SPI, and I2C. This video builds all three from absolute first principles: what a bit on a wire actually is, why the real problem is agreeing on TIME, and how each protocol solves it in a completely different way.
Chapters
0:00 The three languages
0:17 One brain, many helpers
0:44 A wire says one thing at a time
1:10 The core problem: when to sample
1:42 Two answers: share a clock, or agree on speed
2:09 UART: no clock, just trust
2:32 The UART frame: start, data, stop
3:03 Baud rate: agree, or get garbage
3:33 SPI: bring your own clock
4:04 Shift registers: two bytes trade places
4:35 The price of speed: pins
5:06 I2C: the two wire party line
5:31 Addresses: call each chip by name
6:03 The open drain trick
6:34 The scoreboard
7:04 One watch, three languages
7:33 Find them on a Raspberry Pi
7:59 Same job, three accents
Credits
Raspberry Pi 4 Model B photo by Laserlicht, Wikimedia Commons, CC BY-SA 4.0 (https://commons.wikimedia.org/wiki/Fi...)
Narration synthesized locally with the Supertonic TTS engine.