Link for all the libraries: 1. ESP32 : https://github.com/espressif/arduino-esp32 2. OLED Display : https://github.com/adafruit/Adafruit_SSD1306 3. DHT22 Sensor : DHT Sensor Library by Adafruit (in Arduino IDE) , and Adafruit Unified Sensor (in Arduino IDE) 4. PIR Sensor : https://github.com/Seeed-Studio/PIR_Motion_Sensor