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Flashing LED with 555 timer

Former Member

Hello all,

 

I am trying to create a flashing 3 LED circuit with a 9v battery. I want a specific flash time of 20ms and a duty cycle of 1.3 seconds. My question is what size should R1, R2, and C1 be in order to achieve that timing. I found the equations for figuring it out, I was hoping maybe someone would rather take the challenge of giving me the answer instead of me going back to school to relearn algebra. Any help is very much appreciated.

 

Thanks.

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    Mr. John,

    Thank you you for the video. I have tried the same on my Arduino Uno. I guess I should go into more detail as to why I am trying to achieve this effect and on what platform. During my time in the military we used IR strobes in order to ID one another on the ground at night. Through night vision goggles these things are super bright. I actually still have two of them hidden somewhere in my house. One has two probes sticking out that you make contact with them with something conductive to program different flashes The other more simple is set on a fixed time. I can't find them. Here is a link to the exact strobes among others that we used.

    https://www.cejayengineering.com/Buy-Online/IR-Strobes-Beacons/902111IR.html

    I Wanted to try and recreate the circuit in order to use different color LEDs and to learn more about the 555. Every circuit I come up with looks more like a dim light blinking instead of the bright strobe effect that these small strobes produce. I tried to find the ones that I have in order to see what was inside but have had no luck finding them. I looked at there website to see the data sheet and all it really gives is the timing of it. So that's why I have been shooting for that particular timing. If I can figure it out i want to get a bunch of boards printed so that I can make different colors and give them to all the kids in my family. Just something neat to play with and drive there parents crazy. Plus I have a bit of kid left in me as well. I just wanted to see how hard/easy cheap or expensive that I could build them for really.

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  • 0

    Mr. John,

    Thank you you for the video. I have tried the same on my Arduino Uno. I guess I should go into more detail as to why I am trying to achieve this effect and on what platform. During my time in the military we used IR strobes in order to ID one another on the ground at night. Through night vision goggles these things are super bright. I actually still have two of them hidden somewhere in my house. One has two probes sticking out that you make contact with them with something conductive to program different flashes The other more simple is set on a fixed time. I can't find them. Here is a link to the exact strobes among others that we used.

    https://www.cejayengineering.com/Buy-Online/IR-Strobes-Beacons/902111IR.html

    I Wanted to try and recreate the circuit in order to use different color LEDs and to learn more about the 555. Every circuit I come up with looks more like a dim light blinking instead of the bright strobe effect that these small strobes produce. I tried to find the ones that I have in order to see what was inside but have had no luck finding them. I looked at there website to see the data sheet and all it really gives is the timing of it. So that's why I have been shooting for that particular timing. If I can figure it out i want to get a bunch of boards printed so that I can make different colors and give them to all the kids in my family. Just something neat to play with and drive there parents crazy. Plus I have a bit of kid left in me as well. I just wanted to see how hard/easy cheap or expensive that I could build them for really.

Children