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  • Electronic wiring question

    I want to put a time delay (0 to 4 sec ) in the circuit of a fork optical sensor.
    No writhing on it. About 1 square inch half inch thick. It operate on 24VDC wire Yellow and brown wired together. also a blue and a red wire.

  • #2
    Do you want to build this or buy a pre-made board? If you want to build it you can use a 555 chip. If you want most of the work done for you, you can go to Sparkfun.

    http://www.sparkfun.com/products/9439

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    • #3
      Here's a 555 video.
      http://www.youtube.com/watch?v=qwPtS...layer_embedded

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      • #4
        Something like this?
        http://www.newark.com/amperite/24d-1...sec/dp/93B0659
        I cut it twice, and it's still too short!
        Scott

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        • #5
          many thanks for replyes

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          • #6
            Not so fast with the 555. This is a 24 volt part and if it switches the 24 volt signal (less sensitive to noise) then it will fry the 555 without some signal conditioning.

            The yellow/brown are probably -24 vdc, the red is probably +24 and the blue is probably the signal switched to the -24 (ground). Note I said PROBABLY. To test it hook up a 1000 ohm resistor in series with the + line from the test power supply and then connect as I indicated above. It should work if the connections I gave are correct and if they aren't then it shouldn't fry it. If that doesn't work then reverse the functions of the blue and red.

            If it works then measure the high output. If it is greater than 15 volts it must be conditioned before it can be used with a 555 timer circuit.

            To do that connect a 2200 ohm resistor in series with the opto output and hook that to a 12 volt zener diode with cathode to ground. The signal across the zener can then be used to switch the pin 4 enable input on the 555 configured as a one shot timer. When pin 4 goes high the 555 starts timing. The 555 must be running on the same voltage as the zener voltage, in this case 12 volts. If the output of the 555 (pin 3) is to be fed to any sort of other digital electronics then make the zener 5 volts and run the 555 on 5 volts too.

            If you need to start timing when the output goes low then the output of the Opto will have to be inverted. If that is the case then post back and I or somebody else will describe how to do that with just one transistor and a resistor.
            Last edited by Evan; 10-04-2011, 08:20 PM.
            Free software for calculating bolt circles and similar: Click Here

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            • #7
              Originally posted by Evan
              Not so fast with the 555. This is a 24 volt part and if it switches the 24 volt signal (less sensitive to noise) then it will fry the 555 without some signal conditioning.
              Evan, prior to switching to uCs I built more 555-556 circuits than I care to remember. Every one of them were different and every one of the circuits required different interfacing. Hey, it's only a chip! The tech has to design a functional circuit around it. The 24V supply isn't an issue either, that's what regulators, like a 7805 or 7812 are for.

              FYI, I've never had one of my 555 circuits fail on me. This includes auto, marine and high power RF environments. They just require judicious decoupling..

              Chris

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              • #8
                The 24V supply isn't an issue either, that's what regulators, like a 7805 or 7812 are for.
                I know that and you know that but does Luke know that or how to deal with it?
                Free software for calculating bolt circles and similar: Click Here

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                • #9
                  Originally posted by Evan
                  I know that and you know that but does Luke know that or how to deal with it?
                  Not likely, but that's why I asked him if he was looking for a home brew approach or something off the shelf. If he had opted for home brew I would have asked him to join AAC so I could more easily post spiced schematics and walk him through the building and testing process. For certain I'd want much more detailed information from him before embarking down that road.

                  FYI, I can't imagine why but my guess is that you know what AAC is.

                  Chris

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                  • #10
                    If you mean All About Circuits, I have checked out the content but not the forum. I have a pretty complete library on electronics and try to keep up to date, somewhat. It isn't easy though. I spent most of my working life working on electronics, starting with vacuum tubes up to LSI silicon. The part that sucks is that I now play around with surface mount when my eyes are the worst.

                    Here is a laser cut etch mask for an Allergro stepper driver made on my shop built CNC mill. The board is my design.

                    Last edited by Evan; 10-04-2011, 11:51 PM.
                    Free software for calculating bolt circles and similar: Click Here

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                    • #11
                      Originally posted by Evan
                      If you mean All About Circuits, I have checked out the content but not the forum. I have a pretty complete library on electronics and try to keep up to date, somewhat. It isn't easy though. I spent most of my working life working on electronics, starting with vacuum tubes up to LSI silicon. The part that sucks is that I now play around with surface mount when my eyes are the worst.

                      Here is a laser cut etch mask for an Allergro stepper driver made on my shop built CNC mill. The board is my design.
                      I love coffee but over the years I've discovered that drinking it and soldering SMCs don't mix well. If you drink coffee too here's a tip. Before working with SMT chug down two or three beers, wait about 15 minutes and your good to go. Disclaimer: This technique won't do a thing for old eyes!

                      Very nice work on the laser etching!

                      Chris

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                      • #12
                        Hy guys. you lost me on route I'm not an electronic gourou. Can built with a plan not much The device I want is to retard the movement of a bowling pinner. Made some test.
                        The blue wire goes down when sensor is trigged. I try an in line timer (Carlo Gavazzi) don't work and too expensive. There's 16 bowling alley.

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                        • #13
                          So it goes low when the beam is interrupted. What is the sensor going to be connected to? Do you know what sort of signal is expected on the input of pin setter?
                          Last edited by Evan; 10-05-2011, 06:59 PM.
                          Free software for calculating bolt circles and similar: Click Here

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                          • #14
                            I try to read voltage on every wires on the sensor dc+ - ac I got nothing. In and out goes to a logic card When sensor is interupted the logic card give signal to an electric actuator. When we unplug the sensor the logic card start the cycle we want to retard this cycle 2 to 4 sec. because it enterfere with the sweep gate sensor When the bottom of one or more pins hit the gate it give false results to the player

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                            • #15
                              There is a very simple thing you can try. Put a 10 MFD electrolytic capacitor across the sensor output with + to the blue wire and - to the yellow/brown wire. It may work to delay the signal. If it does, the delay can be changed by changing the value. The capacitor should be rated for at least 35 volts.

                              If it doesn't work try a smaller capacitor, perhaps 1 mfd. If that works then try larger values such as 2.2 mfd or two 1 mfd in parallel. Make sure to observe the polarity.
                              Free software for calculating bolt circles and similar: Click Here

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