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  • DrummRBoy commented on mandlabs 's instructable IR (Infrared) Security Alarm System3 months ago
    IR (Infrared) Security Alarm System

    Thanks for the detailed Instructable including all of the theory and explanation of how/why the circuit operates. I do have one random question... I realize the answer to this depends on several internal and external variables but overall, if any possible response-time limiting factors were made ideal: Is this circuit's response time fast enough to trigger when an object moving at very high speeds (say, a bullet fired from a rifle) passes through the transmitting line of sight/light? Do you happen to definitively know, or maybe even have some math to calculate/predict response-time limitations, perhaps how long (micro-seconds/nano-seconds) the path of light must be blocked to allow the rise/fall/mechanisms of action to occur? Again, thank you for the Instructable and thank you in a...see more »Thanks for the detailed Instructable including all of the theory and explanation of how/why the circuit operates. I do have one random question... I realize the answer to this depends on several internal and external variables but overall, if any possible response-time limiting factors were made ideal: Is this circuit's response time fast enough to trigger when an object moving at very high speeds (say, a bullet fired from a rifle) passes through the transmitting line of sight/light? Do you happen to definitively know, or maybe even have some math to calculate/predict response-time limitations, perhaps how long (micro-seconds/nano-seconds) the path of light must be blocked to allow the rise/fall/mechanisms of action to occur? Again, thank you for the Instructable and thank you in advance for any additional info/thoughts relating to response time you may be able to provide.

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