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On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message.

Digital Pins are set as INPUT by default.

I have never connected any other thing on those pins, even 5V.

What I am missing?

void setup() {
    Serial.begin(115200);
    while(!Serial);
    pinMode(LED_BUILTIN,OUTPUT);
    Serial.print("Test");
}

void loop() {
    if (digitalRead(37))
        Serial.print("37");
    if (digitalRead(36))
        Serial.print("36");
    if (digitalRead(35))
        Serial.print("35");
    if (digitalRead(34))
        Serial.print("34");
    digitalWrite(LED_BUILTIN,digitalRead(37));
}

On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message.

Digital Pins are set as INPUT by default. Blink works.

I have never connected any other thing on those pins, even 5V.

What I am missing?

void setup() {
    Serial.begin(115200);
    while(!Serial);
    pinMode(LED_BUILTIN,OUTPUT);
    Serial.print("Test");
}

void loop() {
    if (digitalRead(37))
        Serial.print("37");
    if (digitalRead(36))
        Serial.print("36");
    if (digitalRead(35))
        Serial.print("35");
    if (digitalRead(34))
        Serial.print("34");
    digitalWrite(LED_BUILTIN,digitalRead(37));
}

On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message.

I have never connected any other thing on those pins, even 5V.

What I am missing?

void setup() {
    Serial.begin(115200);
    while(!Serial);
    pinMode(LED_BUILTIN,OUTPUT);
    Serial.print("Test");
}

void loop() {
    if (digitalRead(37))
        Serial.print("37");
    if (digitalRead(36))
        Serial.print("36");
    if (digitalRead(35))
        Serial.print("35");
    if (digitalRead(34))
        Serial.print("34");
    digitalWrite(LED_BUILTIN,digitalRead(37)||digitalRead(36)||digitalRead(35)||digitalRead(34));
}

On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message.

Digital Pins are set as INPUT by default.

I have never connected any other thing on those pins, even 5V.

What I am missing?

void setup() {
    Serial.begin(115200);
    while(!Serial);
    pinMode(LED_BUILTIN,OUTPUT);
    Serial.print("Test");
}

void loop() {
    if (digitalRead(37))
        Serial.print("37");
    if (digitalRead(36))
        Serial.print("36");
    if (digitalRead(35))
        Serial.print("35");
    if (digitalRead(34))
        Serial.print("34");
    digitalWrite(LED_BUILTIN,digitalRead(37));
}

On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message.

I have never connected anything on those pins, even 5V.

What I am missing?

void setup() {
    Serial.begin(115200);
    while(!Serial);
    pinMode(LED_BUILTIN,OUTPUT);
    Serial.print("Test");
}

void loop() {
    if (digitalRead(37))
        Serial.print("37");
    if (digitalRead(36))
        Serial.print("36");
    if (digitalRead(35))
        Serial.print("35");
    if (digitalRead(34))
        Serial.print("34");
    digitalWrite(LED_BUILTIN,digitalRead(37)||digitalRead(36)||digitalRead(35)||digitalRead(34));
}

On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message.

I have never connected any other thing on those pins, even 5V.

What I am missing?

void setup() {
    Serial.begin(115200);
    while(!Serial);
    pinMode(LED_BUILTIN,OUTPUT);
    Serial.print("Test");
}

void loop() {
    if (digitalRead(37))
        Serial.print("37");
    if (digitalRead(36))
        Serial.print("36");
    if (digitalRead(35))
        Serial.print("35");
    if (digitalRead(34))
        Serial.print("34");
    digitalWrite(LED_BUILTIN,digitalRead(37)||digitalRead(36)||digitalRead(35)||digitalRead(34));
}