Hi, i wish to program an Arduino to do the following :
- When switched on, start counting for 24 hours
- At end of 24 hour count, switch on relay
- If an input from a PIR sensor gives a jolt, restart count from beginning
Any suggestions ?
Hi, i wish to program an Arduino to do the following :
Any suggestions ?
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.
#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);
}
?..
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
?
Thanks
Thanks. V helpful
Move this topic to "programming" - it has nothing at all to do with installation or troubleshooting
don't modify earlier posts, if doing so makes nonsense of subsequent comments
@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.
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