# RFID Attendance Logger

Day 73 of the 100 Days 100 IoT Projects collection. Board: ESP32.

An ESP32 logs RFID taps straight into Google Sheets. Attendance tracking with zero paperwork.

## How it works

Each RFID tap triggers an HTTPS request that appends a row — card ID plus timestamp — to a Google Sheet. The ESP32 handles the card reading locally and lets the spreadsheet do the record-keeping. Attendance tracking with zero paperwork and a free cloud database.

## What you'll learn

- Google Sheets API
- Cloud spreadsheet logging
- Timestamped event records
- Paperless attendance systems

Full project (code, wiring diagram, Wokwi simulation): https://github.com/kritishmohapatra/100_Days_100_IoT_Projects/tree/main/RFID_Attendance_Logger

Summary by SkillShop. Code and diagrams belong to the original repo.