Every lab submission must include:

1. Session number and lab name (e.g. "Lab 2.1.1 — UART Deep Dive")
2. What it does — one paragraph description
3. Code — paste your firmware using code blocks
4. Evidence — serial output screenshot OR wiring photo OR video link
5. What you learned — one sentence

Format example:

Lab: 2.1.1 — UART Two-Board Communication

Description: Connected two ESP32 boards via UART. Board A sends a SensorReading_t struct every 2 seconds. Board B receives, parses, and prints.

// your code here

Serial output:

[INF][1234] Received: temp=27.4, hum=62.1

What I learned: UART needs shared GND — forgot this and got garbage data for 20 minutes.

Tag your post with the block tag e.g. block-2