24 hour timer with reset if sensor activated

Using Arduino Project Guidance
1

Hi, i wish to program an Arduino to do the following :

  1. When switched on, start counting for 24 hours
  2. At end of 24 hour count, switch on relay
  3. If an input from a PIR sensor gives a jolt, restart count from beginning

Any suggestions ?

2

These may help with finding/developing a long period timer.

I used them with a microcontroller to do a thing. The microcontroller did other things while waiting for the 24 hour timer to trigger.

For a relay, I suggest getting an opto-isolated relay module.

3 
#define OutputPin 4
#define InputPin 3

void setup() {
  pinMode(OutputPin, OUTPUT);
}

void loop() {
  delay(86400000UL);  //24 * 60 * 60 * 1000
  digitalWrite(OutputPin, HIGH);
  while(digitalRead(InputPin)==LOW);
}
4

?..

5

An Uno does the 16 bit integer thingy. What is the largest number a 16 bit integer can hold?
What is 24*60*60*1000?

6

Thanks

7

Thanks. V helpful

1 Like
9

  1. Move this topic to "programming" - it has nothing at all to do with installation or troubleshooting

  2. don't modify earlier posts, if doing so makes nonsense of subsequent comments

10

@Jontenoy, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project.

11

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