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Code Snippet:

String a;
const int red_led_pin = 13;
void setup() 
{
 Serial.begin(115200);
 Serial.println("Hello, ESP32-S2!");
 pinMode(red_led_pin, OUTPUT); 
}
void loop() {
 while (Serial.available()) 
 {
 a = Serial.readString();// read the incoming data as string
 Serial.print(" First: ");
 Serial.println(a);
 
 if (a.equals("on"))
 {
 Serial.println("LED ON");
 digitalWrite(red_led_pin, HIGH);
 }
 else if (a == "off" || a == "OFF")
 {
 Serial.println("LED OFF");
 digitalWrite(red_led_pin, LOW);
 }
 Serial.print("Second: ");
 Serial.println(a);
 }
}

Serial.print out:

enter image description here

Circuitry:

enter image description here

Issue:

The code can't capture the on string or any other string (on, off or OFF) that I pass. However it does pick it up and Serial.print it.

What is going wrong?

Things I have tried:

I have tried as a comparison:

• if (a.equals("on")){<>}
• if (a == "on")){<>}
• if (a.equalsIgnoreCase("on")){<>}

Due Diligence / Prior Research:

• String Comparison Operators
• String()
• Compare characters (or string) in "if" function

Code Snippet:

String a;
const int red_led_pin = 13;
void setup() 
{
 Serial.begin(115200);
 Serial.println("Hello, ESP32-S2!");
 pinMode(red_led_pin, OUTPUT); 
}
void loop() {
 while (Serial.available()) 
 {
 a = Serial.readString();// read the incoming data as string
 Serial.print(" First: ");
 Serial.println(a);
 
 if (a.equals("on"))
 {
 Serial.println("LED ON");
 digitalWrite(red_led_pin, HIGH);
 }
 else if (a == "off" || a == "OFF")
 {
 Serial.println("LED OFF");
 digitalWrite(red_led_pin, LOW);
 }
 Serial.print("Second: ");
 Serial.println(a);
 }
}

Serial.print out:

enter image description here

Circuitry:

enter image description here

Issue:

The code can't capture the on string or any other string (on, off or OFF) that I pass. However it does pick it up and Serial.print it.

What is going wrong?

Things I have tried:

I have tried as a comparison:

• if (a.equals("on")){<>}
• if (a == "on")){<>}
• if (a.equalsIgnoreCase("on")){<>}

Due Diligence / Prior Research:

• [ Documentation ] String Comparison Operators
• [ Documentation ] String()
• [ Forum ] Compare characters (or string) in "if" function

Code Snippet:

String a;
const int red_led_pin = 13;
void setup() 
{
 Serial.begin(115200);
 Serial.println("Hello, ESP32-S2!");
 pinMode(red_led_pin, OUTPUT); 
}
void loop() {
 while (Serial.available()) 
 {
 a = Serial.readString();// read the incoming data as string
 Serial.print(" First: ");
 Serial.println(a);
 
 if (a.equals("on"))
 {
 Serial.println("LED ON");
 digitalWrite(red_led_pin, HIGH);
 }
 else if (a == "off" || a == "OFF")
 {
 Serial.println("LED OFF");
 digitalWrite(red_led_pin, LOW);
 }
 Serial.print("Second: ");
 Serial.println(a);
 }
}

Serial.print out:

enter image description here

Issue:

The code can't capture the on string or any other string (on, off or OFF) that I pass. However it does pick it up and Serial.print it.

What is going wrong?

Things I have tried:

I have tried as a comparison:

• if (a.equals("on")){<>}
• if (a == "on")){<>}
• if (a.equalsIgnoreCase("on")){<>}

Due Diligence / Prior Research:

• String Comparison Operators
• String()
• Compare characters (or string) in "if" function

Code Snippet:

String a;
const int red_led_pin = 13;
void setup() 
{
 Serial.begin(115200);
 Serial.println("Hello, ESP32-S2!");
 pinMode(red_led_pin, OUTPUT); 
}
void loop() {
 while (Serial.available()) 
 {
 a = Serial.readString();// read the incoming data as string
 Serial.print(" First: ");
 Serial.println(a);
 
 if (a.equals("on"))
 {
 Serial.println("LED ON");
 digitalWrite(red_led_pin, HIGH);
 }
 else if (a == "off" || a == "OFF")
 {
 Serial.println("LED OFF");
 digitalWrite(red_led_pin, LOW);
 }
 Serial.print("Second: ");
 Serial.println(a);
 }
}

Serial.print out:

enter image description here

Circuitry:

enter image description here

Issue:

The code can't capture the on string or any other string (on, off or OFF) that I pass. However it does pick it up and Serial.print it.

What is going wrong?

Things I have tried:

I have tried as a comparison:

• if (a.equals("on")){<>}
• if (a == "on")){<>}
• if (a.equalsIgnoreCase("on")){<>}

Due Diligence / Prior Research:

• String Comparison Operators
• String()
• Compare characters (or string) in "if" function