Replace button by a component/circuit in 555 diagram

Question

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!

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• Stack Exchange Broke The Law: 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.
• RoyC: If you are using a microcontroller to drive this why are you using a 555?
• Jaime: 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?

Answer 1

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

schematic

^{simulate this circuit – Schematic created using CircuitLab}

• RedGrittyBrick: Two relays, a 555 and a half-dozen passives does seem like overkill to turn a small LED on and off using a microcontroller.
• BeB00: @RedGrittyBrick Yeah, needs another 555 as a buffer between the relay and the microcontroller
• RedGrittyBrick: I'm so tempted to recommend a 741.
• Jaime: could you bring me a circuit to help me?
• BeB00: @Jamie I added a circuit diagram