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Thread: Daystate Mk4 diy electronic board

  1. #1
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    Default Daystate Mk4 diy electronic board

    This is a single board that replaces both electronic boards in the daystate MK4is - FAC - 5.5mm air rifle.




    Specifications:


    - Eight Power stages: 3 , 6 ,12 , 16 , 20 , 25 , 30 , 35 ftlbs.

    - Step free Electronic regulation based on unique mathematical function for each power stage.

    - Micro adjusting for each power stage.

    - Adjusting capacitor’s top voltage from 61 to 76 volts in 0.1volt step.(Daystate default = 69-70v)

    - Constant current ,constant voltage battery charging circuit.

    - Atmega328 mcu @ 16mhz.

    - It could possible work in MVT (not tested) but you will loose the chrono function.



    -There is no waterproof coating , so water must be strictly avoided.

    -There is no auto shutdown function .

    -There is no buzzer or other audible warning, you can check the battery voltage on the LCD and recharge when reaches 7.5V

    -Circuit consumption is about 16ma with lcd light off . With the 850mah battery you expect 53hours of continuous operation .

    -Power can reach 40+ ftlbs with capacitor overcharge and power shift > 1.000 .

    -Low power stages 6 ftlbs and 3 ftlbs are used just for fun shooting .Do not expect good consistency . Especially the 3 ftlbs level can cause a tight pellet to remain into the barrel due to frictions.

    -Shots remaining calculation is based on pressure and power levels and it is not shot accurate.

    If the pressure drops below the threshold that can produce the chosen level , remaining shot indicator will show 0.

    The menu has 4 sections:
    1)power stage select
    2)capacitor's voltage adjust
    3)Lcd light on>off>5sec on
    4) Individual stage power shift

    Random Chrono results (unweighted pellets).
    JSB 18.2 grain @35ftlbs

    281.4
    281.5
    283.8
    282.8
    283.6
    282.7
    283.8
    280.7
    277.5
    279.1
    283.1
    282.7
    279.3
    279.1
    276.9
    278.2
    281.6
    278.4
    280.5
    278.3
    276.9
    278.2
    277.5
    277.7
    277.3

    JSB 18.2 grain @30ftlbs


    269.2
    266.9
    269.1
    271.4
    270.3
    272.5
    271.2
    264.2
    267.5
    268.9
    268.2
    266.6
    271.9
    269.3
    271.7
    272.2
    271.4
    271.1
    268.3
    270.4
    270.9
    270.1
    270.3
    269.7
    271.5
    271.3
    271.2
    270.4
    269.8
    269.4
    267.5
    268.8
    268.5
    267.6
    267.5
    265.8
    266.1
    265.3
    263.7
    262.9

    HN TROPHY 14.6 grain @25ftlbs


    265.1
    266.1
    266.0
    268.4
    266.9
    264.7
    270.4
    266.7
    268.7
    263.7
    265.9
    265.8
    268.7
    265.5
    266.1
    267.4
    266.8
    264.9
    264.3
    266.5
    260.9
    269.5
    266.2
    266.0
    266.4
    266.7
    267.1
    265.8
    269.0
    266.9
    266.0
    267.6
    267.2
    265.0
    268.6
    268.4
    267.5
    268.6
    264.5
    268.2
    264.7
    270.5
    265.6
    268.0
    264.5
    266.2
    267.4
    267.7
    267.2
    266.0
    261.1
    269.3
    267.1
    263.2
    267.3
    266.9
    267.0
    265.5
    263.5
    264.4
    Last edited by jhnntfts; 14-07-14 at 09:32.
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  2. #2
    REP: Oom A's Airguns

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    Welcome to the forum. A very interesting first post.
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  3. #3
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    This project is not for sharing anymore due to personal reasons. Thanks.
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  4. #4
    REP: Tula!! Silencers

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    Quote Originally Posted by jhnntfts View Post
    This project is not for sharing anymore due to personal reasons. Thanks.
    I think that's a real pity, any Threads like this that are interesting and informative are brilliant.....
    Welcome to the Forum.
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  5. #5
    Prof. Jan Itor

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    Considering that there must have been a considerable amount of R&D for this it does not surprise me that : http://www.ebay.com/itm/Daystate-mk4...item33917b47d2
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  6. #6
    REP: Tula!! Silencers

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    Fair comment CK, i would do the same....
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  7. #7
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    Instead , maybe i can help if anyone has problems with the electronics of the daystates.
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  8. #8
    Inactive Member

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    Some update:

    A new better looking, factory made printed circuit board and a couple of menu enhancements.

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  9. #9
    Sharp Shooter

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    Can this be used to uograde a mk3 to a mk4? Extra screen and sensors would be required I guess? Probably not worth it
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  10. #10
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    Quote Originally Posted by Hiluxman View Post
    Can this be used to uograde a mk3 to a mk4? Extra screen and sensors would be required I guess? Probably not worth it
    Pressure sensor fit is the major problem. I wouldn't drill the tube in any case to install the sensor at the position that mk4 has it. The only safe way is to make a new front cap with side quick fill and fit a sensor in the front. This requires good machining skills and the associated equipment + the awareness of the forces you dealing with. The lcd screen installation is relatively simple.
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  11. #11
    Sharp Shooter

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    Thanks for your prompt reply. Then again, my Mk3 Rt still has the Corick regulator that produces fantastic results. If it works, why fiddle with it as they say
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  12. #12
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    Hi everyone
    Just signed up to the forum. I have a Mk4 is sport .20 but its the standard UK FT spec. I've been trying to find someone that can help me with a upgrade to FAC (25-30)
    Will this board work on my rifle?
    I'm shooting at 80-90 meters max. Like to strech to 120+
    Please help
    Meny thanks
    AirHunterSA. .
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  13. #13
    Sharp Shooter

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    AirhunterSA

    A 5mm pellet weighing around 13.7gr beyond 120m is like throwing popcorn at a target beyond 10m in my opinion.

    youre talking .22 rimfire....

    leave the rifle alone I would suggest
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  14. #14
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    Hiluxman
    Morning and thanks for the quick reply. I love it to bits. Pellet on pellet @ 40-50m only target shooting. But I like to push myself to the limit.
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  15. #15
    Protea FT Team '15
    REP: Daystate/Brocock Accredited Technician

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    Airgunhunter, please contact me next week after Thursday when I will be back in SA, will be able to assist. Wyan
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