The place where random ideas get written down and lost in time.

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2020-11-17 - Blinking LED -- Naive RC approach

Category DEV

Goal: blinking led in the garage when the side bolt is closed. Ideally battery powered.

  • Idea is to have it blink to save energy and work longer in battery.
  • What is the simplest way to blink a led, or more exactly the less current usage?
  • How much can I expect of e.g. an AA battery? Or a couple add I have a holder for that.

Random idea: use a led forward voltage, resistor slowly charging a cap and when above the led voltage it would discharge.

Resistor-Capacitor (RC) Time Constant Calculator | DigiKey Electronics

  • To compute a RC time:
  • Tau = R.C = 63% of final charge time.

This does not work, as tried in National Instruments Multisim:

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