UNO R4 Wifi Is Not Sending Words In Serial Monitor

Using Arduino Programming Questions
1

Hi.... My Uno R4 Wifi is NOT sending words or letters in the Serial Monitor. Like for the word detected it is sending the numbers 1668572516.

int LED = 13;
int IR = 3;
void setup() {
  pinMode(LED, OUTPUT);
  pinMode(IR, INPUT);
  Serial.begin(9600);
}

void loop() {
  int IR = digitalRead(3);
  if(digitalRead(IR == 0)){
    digitalWrite(LED, HIGH);
    Serial.println('Detected');
  }
  else{
    digitalWrite(LED, LOW);
  }
}
2

Hi @Samar2013

Single quotes (') can only be used with a single character literal (e.g., Serial.println('D')). You must wrap string literals in double quotes ("):

    Serial.println("Detected");

This is the cause of the unexpected output you saw in Serial Monitor.

There is also a bug in your code here:

Please carefully study the Arduino language reference for digitalRead to learn how to use the function correctly:

3

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