ESP32 Lesson 9: create interface for ultrasonic sensor in web

Code: website: ESP32 Previous Lessons: 1. Getting started: 2. Modes of Wi-Fi in ESP32 : 3. Access point Mode in ESP32 : 4. Web Server LED control : 5. DHT11 Temp & Humidity webserver : 6. Send Email : 7. Sleeping Modes : 8. Webserver Stepper Motor control: