Generating a delayed pulse with one 555 timer upon powering up the circuit

I created the following circuit that seems to be able to accomplish that task with just one 555 and no external triggers.

Explanation of my circuit:

  • The left-side attempts to simulate a delayed trigger pulse.
    • R1-C1 is slowly decreasing the voltage from high to low and manipulates the length of time when output will be on LOW (~15 seconds)
    • R3-C3 is increasing the voltage but slightly slower than R1-C1 so that Trigger voltage dips below 3V but not for long
  • The right-side is a monostable 555 implementation
    • R4-C4 manipulates the length of time when the output would be on HIGH (~5 seconds)

schematic

simulate this circuit – Schematic created using CircuitLab

Here are the voltage measurements:

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Here are the current measurements:

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I think this implementation works but is there an easier way to accomplish that?

Tags:

555