i have an extra arduino mega and i want to use it for something quite simple. I have a custom switch on my laptop and want to wire the arduino in insteed of the switch so that when the ardunio gets power it works as a momentary switch for 1-2 seconds then turns off. the input of the cable is 3.3 v and i want that signal just passed through the arduino almost as an automatic momentary switch to turn my laptop on when ever it gets power. i also want to add the momentary switch to the circuit so that if i tap it it triggers the momentary 1-2 seconds switch and if i hold the switch down it connects the two lines until i let go of the switch. If anyone could help me with the coding or tell me if this is even possible i would appriciate i as im not a programmer. if anyone needs me to draw an amature diagram to understand what i mean feel free to let me know. it'll prob look like a piccaso from china but hey, as long as it gets the job done lol
ps. if anyone wants to know what its for, im building a guitar loop station pedalboard with a lot of built in stuff, incuding a torndown laptop. and i want this to functions as an automatic power on when i plug the pedalboard into power (i will not be using the laptop battery) as this would make things easier when seeting up for live gigs.
i have an extra arduino mega and i want to use it for something quite simple. I have a custom switch on my laptop and want to wire the arduino in insteed of the switch so that when the ardunio gets power it works as a momentary switch for 1-2 seconds then turns off. the input of the cable is 3.3 v and i want that signal just passed through the arduino almost as an automatic momentary switch to turn my laptop on when ever it gets power. i also want to add the momentary switch to the circuit so that if i tap it it triggers the momentary 1-2 seconds switch and if i hold the switch down it connects the two lines until i let go of the switch. If anyone could help me with the coding or tell me if this is even possible i would appriciate i as im not a programmer. if anyone needs me to draw an amature diagram to understand what i mean feel free to let me know. it'll prob look like a piccaso from china but hey, as long as it gets the job done lol
ps. if anyone wants to know what its for, im building a guitar loop station pedalboard with a lot of built in stuff, incuding a torndown laptop. and i want this to functions as an automatic power on when i plug the pedalboard into power (i will not be using the laptop battery) as this would make things easier when seeting up for live gigs.
It looks possible, provided that you didn't omit essential information.
Have a look at the Debounce and StateChangeDetection examples for handling switches.
Optocouplers can be used for safe signal transmission between the Arduino and the laptop.
I think you should draw a diagram of all the components you've mentioned including any separate power supplies.
In principle, you can use a relay module as a switch replacement. However, using an Arduino Mega for the simple task of providing a 1-2 second activation of a relay module appears, on the face of it, to be overkill.
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Paul__B:
Sounds like a grossly inappropriate use of a Mega 2560.
A Pro Mini would be far more suitable.
The smallest attiny would be even more appropriate.
hammy:
Just check there isn’t a setting in bios that will allow your laptop to do this automatically by itself ?
That is the first place I'd be looking, almost all desktops will have the ability to turn on either at a specific time, or resume the same state as when power was lost (in other works, turn back on automatically if the computer was running when power was lost). Not sure if I've even looked at a laptop bios to see if that setting exists.
What exactly are you using the laptop for? Sounds kind of excessive for the application.
so im programing an arduino mega to turn on a pc and the program works.. kind of
to turn on the pc i need the ardunio to send a 3.3v signal to the pc. that part works. i also want to add in a momentary switch to be able to turn the signal (3.3v) on again for 1 second to turn the pc off. the problem is that when i run the program the first part of it seem to loop. i have put a 5 seconds delay on it so that the pc has the time to charge up before it turns on. so whats happening is that the arduino send the 3.3 v signal after 5 seconds, turns off, waits 5 seconds then sends the signal again. i dont know if its something in the code that is incorrect or what. could really use some help.
so to be clear, i want it to wait 5 seconds when the arduino gets power, thensend a 3.3v signal for 1 second then do nothing until i press the switch
here is the code
int button=8;
void setup() {
// put your setup code here, to run once:
pinMode(button, INPUT);
pinMode(12, OUTPUT) ;
}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite (12, LOW) ;
delay(5000) ;
digitalWrite(12, HIGH) ;
delay(1000);
digitalWrite(12, LOW) ;
if (button, LOW){
digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
}
}
And if you look at some code examples you'll never see an if statement that looks like that. Because , (comma) isn't a comparison. == is a comparison. So are < > != etc.
