Arduino Nano @ delay signal

Official Hardware Nano Family Classic Nano
1

Hello,

I use the arduino Nano.

I'm trying to create a delay signal (~1.2sec) after turning power ON.

Pin "D2" reading power ON, with a resistor 20K to GND and 1K to +5V
Pin "D13": output for delay signal
But I get an oscillation on signal output ?!

Could anyone please explain this issue ?

Here is my code:

// Set pin numbers:
const int powerOn = 'D2';     // at pin #2, adding a resistor 1K pull up and a resistor 20K to GND !!! ***
const int BLM_RESET = 'D13';  

// variables will change:
int poweronState = 0;      // variable to read the status of power

void setup() {
  // initialize the powerOn pin as an input:
  pinMode(powerOn, INPUT);  

  // initialize delai_1.2 s as an output:
  pinMode(BLM_RESET, OUTPUT);

  // read the state of the poweronState value:
  poweronState = digitalRead(powerOn);
}
  
void loop() {
   // check if the power is ON. If it is, the pin #2 is HIGH:
  if (poweronState == HIGH) {  // power is ON
    delay(1200); // waiting for 1200 ms (1.2s) before BLM_RESET is actived HIGH
    digitalWrite(BLM_RESET, HIGH);
    }

  else { 
    // if power is OFF, turn BLM_RESET off:
    digitalWrite(BLM_RESET, LOW);
    // delay(20);
    } 
}
2

You're not using a Nano 33 IoT so your topic has been moved to a more suitable location on the forum.

Where do you get the below from?

That should just be 2 and 13, no D and no ticks around them.

3

the

20241022_092026
20241022_0920261920×1282 194 KB

signal

4

Thanks for replying. Note.

6

pin13XX
pin13XX715×496 76 KB

7

You are using pin 13.
I think your problem is that the bootloader flashes the pin13 LED just after power up (or reset).

Try using any other pin for your delay signal.

1 Like
8

Hi all,

I found the problem: I use the USB cable (or +5V on board, pin 27) to power pin D2.
After using the power extern, I don't see the oscillation on the delay signal.

Thanks for your support !

9

Hi, I see the same behave on other pin. Your idea is closed to this issue.
Thanks for replying.

10

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