I'm hacking an mp3 player that has a pushbutton switch. The input pin of the chip
that senses button presses is normally pulled up to 3V. When the tactile button
is pressed the pin gets shorted to ground. I want to replace the mechanical action
of pressing a button with a signal from another circuit.
My control line switches from floating to ground when the event of interest
occurs. How can I make the mp3 player interpret this signal as a button press?
Is a capacitor between the input pin and the control line good enough?
Or would it be better to use a pnp in parallel with the pushbutton with control
line going to the base?
that senses button presses is normally pulled up to 3V. When the tactile button
is pressed the pin gets shorted to ground. I want to replace the mechanical action
of pressing a button with a signal from another circuit.
My control line switches from floating to ground when the event of interest
occurs. How can I make the mp3 player interpret this signal as a button press?
Is a capacitor between the input pin and the control line good enough?
Or would it be better to use a pnp in parallel with the pushbutton with control
line going to the base?