I need your help im crazy with this, i already tried many ways to do it, i need to replace the push button in this circuit by a component or circuit to be activated for a signal of 5 v such as a microcontroller one, please help me, could you draw a diagram for me with this.

Thanks in advance!

enter image description here

  • \$\begingroup\$ I would consider finding a different circuit that does the same thing but where one side of the button is connected to ground. Then use an NPN transistor. \$\endgroup\$ – user253751 Feb 23 '18 at 4:53
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    \$\begingroup\$ If you are using a microcontroller to drive this why are you using a 555? \$\endgroup\$ – RoyC Feb 23 '18 at 9:11
  • \$\begingroup\$ i haven't found a circuit with this trigger function and the button connected directly to ground, and im not using a microcontroller im using a 5v pulse from a battery, could you help me with a diagram? \$\endgroup\$ – Jaime Feb 23 '18 at 13:21

It wouldn't be a great design, but if you were an electronics beginner and just wanted a simple substitution, you could use a relay instead of the button.

edit: added schematic


simulate this circuit – Schematic created using CircuitLab

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    \$\begingroup\$ Two relays, a 555 and a half-dozen passives does seem like overkill to turn a small LED on and off using a microcontroller. \$\endgroup\$ – RedGrittyBrick Feb 23 '18 at 12:06
  • \$\begingroup\$ @RedGrittyBrick Yeah, needs another 555 as a buffer between the relay and the microcontroller \$\endgroup\$ – BeB00 Feb 23 '18 at 12:07
  • \$\begingroup\$ I'm so tempted to recommend a 741. \$\endgroup\$ – RedGrittyBrick Feb 23 '18 at 12:14
  • \$\begingroup\$ could you bring me a circuit to help me? \$\endgroup\$ – Jaime Feb 23 '18 at 13:21
  • \$\begingroup\$ @Jamie I added a circuit diagram \$\endgroup\$ – BeB00 Feb 23 '18 at 13:31

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