"Home Security System Using Ultrasonic Sensor To Get ESP8266 Notifications on Telegram!" is a smart home project that utilizes an ultrasonic sensor to monitor the distance between an object and the sensor. The project is built using the NodeMCU development board, which is based on the ESP8266 Wi-Fi module. When the ultrasonic sensor detects an object within a certain distance, the NodeMCU board sends a message to the user's Telegram account, notifying them of the intrusion.