ESP32 Temperature Data Logger (DHT22 + DS1307 RTC + microSD + OLED)

Build a timestamped temperature logger with ESP32! Read DHT22 temperature/humidity every 10 seconds, get real-world time from DS1307 RTC, and log to microSD card as CSV. The OLED displays live temperature (large font), humidity percentage, timestamp, and log counter. The `/temp_log.csv` file on the SD card opens in Excel, Google Sheets, or Python pandas for analysis — perfect for greenhouse monitoring, home/room temperature tracking, laboratory data collection, food storage conditions, or beehiv