Instagram Facebook YouTube Code :- /* code started code created by Technical idEas  #define buzzer=11  #define led=12 #define trigPin = 10; #define ehoPin = 9; 16x2 lcd connection                  rs = 2, en = 3, d4 = 4, d5 = 5, d6 = 6, d7 = 7;    channel link :- https://youtube.com/channel/UCCJyR_wnt3SxhErsSUP9Wrw */ #include <LiquidCrystal.h>  LiquidCrystal lcd(2, 3, 4, 5, 6, 7); const int trigPin = 10; const int echoPin = 9; long duration; int distance; void setup() {     pinMode(trigPin, OUTPUT);    pinMode(echoPin, INPUT);      pinMode(11, OUTPUT);    pinMode(12, OUTPUT);   Serial.begin(9600);      lcd.begin(16,2);    lcd.setCursor(0, 0);     lcd.print("  Technical idEas "); delay(5000);   } void loop() {     digitalWrite(trigPin, LOW);       delayMicroseconds(2);     ...