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How can I simulate a button press

dzavoo

Hey!

I am new to this field and I may not understand some terminology correctly, anyways,

 

Currently I am working on a project that releases smoke when the on/off button is pressed, I need to simplify the mechanism

and I want it to immediately start working when I plug it in to power source (without physically pressing the button).

 

I tried removing button entirely from the mechanism and I connected the "in" and "out" wires directly to each other

(without connecting them with a button) but it registered as a long button press, I need it to register something like a short impulse, like the physical button does.

 

How, and with what, should i connect the "in" and "out" wires together so it will trigger and simulate a short button press?

I dont have any access to board's software so i have to do something with the hardware or i can add another board to the system.

 

Thank you very much!!

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  • You should be able to create a power-on pulse with a capacitor and maybe a resistor.

    If the button shorts out a signal to ground, then just a capacitor where the button was will "keep the button pushed" for a short time. A large resistor across the capacitor will ensure it gets reset for the next power on sequence.

    If the button supplies power when pushed, again putting a capacitor where the button was will cause a "button push" on power-up. In this scenario a resistor may be needed from the output to ground to make sure the capacitor signal goes away in a reasonable time.

    If the capacitor is large, you might want a diode to ensure the signal doesn't go negative.

Reply

  • You should be able to create a power-on pulse with a capacitor and maybe a resistor.

    If the button shorts out a signal to ground, then just a capacitor where the button was will "keep the button pushed" for a short time. A large resistor across the capacitor will ensure it gets reset for the next power on sequence.

    If the button supplies power when pushed, again putting a capacitor where the button was will cause a "button push" on power-up. In this scenario a resistor may be needed from the output to ground to make sure the capacitor signal goes away in a reasonable time.

    If the capacitor is large, you might want a diode to ensure the signal doesn't go negative.

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