After running, leave HIGH for 30 minutes

Projects Programming
1

After running, leave HIGH for 30 minutes and then back to LOW. How to make such a timer?

  if (mosfet == 1)
  {
    digitalWrite(MOSFETpin, HIGH); // only 30 minutes
  }
2

(deleted)

3

Using a serial line (SoftwareSerial = toESP), when I send mosfeton, I need to get HIGH on mosfet via pin A1, but only 30 minutes. Then I need to give LOW automatically.
I also have the option to manually turn off the mosfetoff.
But now it's about the on timer for only 30 minutes.

#include <SoftwareSerial.h>

SoftwareSerial toESP(12, 11);
#define MOSFETpin A0
int mosfet;

void setup() {
  Serial.begin(9600);
  delay(300);
  toESP.begin(9600);
  delay(300);

  pinMode(MOSFETpin, OUTPUT);
}
void loop() {
 
  if(toESP.available() > 1)
  {
    String value;
    value = toESP.readStringUntil('\n');
    value.trim();
    Serial.println(value);
     if(value == "mosfeton")
     {
        Serial.println("ON mosfet");
        mosfet = 1;
     }
     if(value == "mosfetoff")
     {
        Serial.println("OFF mosfet");
        mosfet = 0;
     }
  }  

  if (mosfet == 1)
  {
    digitalWrite(MOSFETpin, HIGH); // only 30 minutes
  }

  if (mosfet == 0)
  {
    digitalWrite(MOSFETpin, LOW); // manual shutdown
  }
}
4

Hi, can anyone advise me Thank you very much

5

When mosfet goes true , IDE -> file/examples/digital/statechangedetection, set a boolean true. Use the boolean value to enable a timer to run. When the timer reaches preset, set the boolean to false and do whatever else happens when the timer runs out.

6

blink without delay also shows you how to use millis() in a way that lets you time things