Olympic rapid fire training aid

Discussion in 'The Projects Forum' started by MarkAB, May 2, 2016.

  1. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    Hi can anyone help me in building a circuit for a training aid.

    It must have a start switch that after pressed gives an audible beep and shows a red led, after a 1 minute delay an audible beep signalling the start of a 7sec delay to end with start of a 4 sec green led(red off) followed back to the red led and restarts the initial beep and 1 min count.

    switch -beep- 1min red led - audible beep - 7sec - 4 sec green led (red off) - back to start beep and 1min red led on

    It would be a huge advantage if the timings could be programmable.

    This product is the closest available to purchase but not quite what I need.
    http://www.edinkillie.co.uk/ecatalog/techro-box-p-585.html?cPath=23_25
     
  2. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    This can be done with a few CMOS chips, but it is an excellent candidate for a PIC, Rpi, small Arduino, etc.

    ak
     
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  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Your description amounts to a 71 second pattern with three decoded states at 60, 67, and 71 seconds. A CD4521 can provide the binary count with crystal accuracy without calibration. Decoding the three states takes a bunch of gates, or 10 small signal diodes and three resistors. So the first pass BOM is:
    1 - CD4521
    1 - 32.768 kHz watch "crystal"
    1 - CD4093 or CD40106 (don't know which one yet)
    10-12 - 1N914 / 1N4148 signal diode
    3 - 2N7000 small MOSFET transistor (LED and beeper drivers)
    5 - resistors
    5 - capacitors

    ak
     
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  4. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    I am about to receive some 555 timers and will be playing with them on the bread board. Any ideas?
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    I'm not a big fan of long-delay 555 circuits. This can be done with three 555's in a ring, but it will take some messing around and extra parts to bet the trigger polarities and output functions correct.

    ak
     
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  6. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    Since this is just a "do something-wait-do something else.... etc." cycle, a cheap Arduino Nano clone running a modified version of the simple "blink" sketch is all you need. Don't worry if you've never programmed anything before, this is as easy and inexpensive as it gets.
     
    Last edited: May 5, 2016
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  7. takao21203

    Distinguished Member

    Apr 28, 2012
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    With old-school technology it will be hardwired and take two weeks.

    With mcu it will take one or two days and the software can be changed by refreshing.
     
  8. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Here is one version: Missing is 1/2 sec. beep circuit, will add later. All Rs 10k except as noted, pots all 1 meg.
    Q5 is power-up reset. Also missing line from top + to bottom +, Q4-8. Range Timer 00000.jpg
     
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  9. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Beeper. Sounder,S , similar to Radio shack 273-060, 4-28V DC. Range Timer #2 00000.jpg
     
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  10. takao21203

    Distinguished Member

    Apr 28, 2012
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    my reaction to people making such circuits at some stage was, sell them NE555 chips.
     
  11. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    Wow thank you so much, this is great, will have to study this close as I am a newbie to electronics but I so much want to build this thanks.
    Does this circuit connect to the other or are they separate ? please forgive me.
     
  12. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Beeper connects to other circuit.
     
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  13. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    Could you please check my shopping list

    Cap 1 0.1 microfarad
    Cap 2 0.1 microfarad
    Cap 3 100 microfarad
    Cap 4 10 microfarad
    Cap 5 10 microfarad
    Cap 6 0.1 microfarad
    Cap 7 0.1 microfarad
    Cap 8 1 microfarad ???
    Cap 9 can’t find one ?
    Cap 10 0.1 microfarad
    Cap 11 10 microfarad
    D1,D2 & D3 are all 1N4148 ?
    3 x 1M POT
    4 x 555 timers ( I have NE555p timers would these be ok?)
    1 red & green led
    12 x 10K resistors
    200 & 300 Ohm resistor
    47K resistor
    is Q5 a NPN BJT ?
     
  14. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    Does anyone know of a good simulator I could try this circuit in so I don't blow anything up lol ?
     
  15. Brownout

    Well-Known Member

    Jan 10, 2012
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  16. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Your shopping list looks good. C8 is 1 uF, diodes all 1N4148 or 1N914 or = .
    NE555P, NE555N, Mc1455P are all the same, also comes in a TO5 can @ about 5 X more $.
    Q5, NPN like 2N3904. Are you making beeper later ?
    Do you have a solderless breadboard ? That is what I use, usually with some mistakes, the holes just seem to
    be getting closer together as the years pass. I would set it up one stage at a time & test. Temp. connect 555 pin 4's to + V, add power- up later. Temp. add resistor & LED to 555's output-P3 to watch progress.
    Watch for cap's polarity, re check every thing before applying power. Good luck.
    Note- Q2-8 missing connection to +V, Q3-8 not labled
     
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  17. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    Yes I will be needing the beeper later.
    Yes I do have a solderless breadboard but I have no idea how to brake this circuit down to stages?
    Sorry to be such a bother but I am quite new to all this but I am very passionate about it thou.
     
  18. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Try hooking up Q1 & then Q2. Might use a different color LED so as not to confuse with R or G Range Timer #3 00000.jpg
     
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  19. takao21203

    Distinguished Member

    Apr 28, 2012
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    I have small 1M pots. Saw them in a 1980s Mitsubishi VCR, searched for them quite a long time.
    s-l1600.jpg
     
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  20. MarkAB

    Thread Starter Member

    Feb 27, 2016
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    Aw pity I already bought some in e-bay but thanks anyway.
     
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