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What kind of system to use for automatic raising and lowering of roller blinds in the house j

Tadeusz5 2595 11
Best answers

How can I automatically lower 16 roller shutters at dusk and raise them at dawn using momentary NO contacts that stay active for about one minute?

Use a small microcontroller or PLC with a twilight sensor and timed relay outputs so it can energize the lower/raise circuit for about one minute at dusk and dawn. One suggestion is a microcontroller reading a twilight sensor on an ADC and driving relays through transistors, with the output held for one minute [#14416529] Another is a small PLC with an analog input using a photoresistor voltage divider and relay outputs, or a commercial twilight automaton plus two timer relays set to delayed-off, one for lowering and one for lifting [#14418013] The key is that the control device should generate the short NO pulse and then release it automatically, so the shutter relays do not remain active. A ready-made twilight switch with a relay output was also suggested as a simpler off-the-shelf option [#14420058]
AI summary based on the discussion. May contain errors.
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  • #1 14416468
    Tadeusz5
    Level 10  
    Posts: 32
    Hello, and please help me to solve the problem of automatic switching on and off the external roll-down shutters depending on the time of day. I need an automatic twilight or similar system which would lower the roller-blinds in the whole house at night (there are 16 of them) using a NO contact which should hold for approx. 1 minute (this is the time of lowering the roller-blinds), after which the contact should disconnect. The problem is that at daybreak the second NO contact is to be switched on and should also hold for about 1 minute (this is the time for raising the shutters) and should also switch off after this minute. The whole system for lowering and raising the roll-down shutters is made up of relays. One part of the relays raises the roller shutters and the other part lowers the roller shutters and if any of the contacts were in the active state, there is no way to activate the opposite option. Thank you in advance for your advice.
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  • #2 14416529
    bearq
    Level 39  
    Posts: 4883
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    The simplest solution would be to use a small microcontroller to create a twilight sensor on an ADC and, depending on the state, close or open the roller shutters. Control it with transistors which will switch relays and keep the appropriate state on the output for one minute.
  • #3 14416580
    azibik
    Level 32  
    Posts: 1950
    Help: 82
    Rate: 322
    2 X 741/twilight sensor/
    2 x NE555/ timer/
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  • #4 14418013
    pafciowaw
    Automation specialist
    Posts: 2439
    Help: 480
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    Any small PLC can be used (e.g. AF-10MRD DC 12-24V net = 350 PLN (PLC, display, cable; soft free)
    for this a 230/24 low-power power supply (only PLCs with 24 Vdc power supply have analogue/measuring inputs;
    and a photoresistor + resistor to build a voltage divider depending on the light falling on the photoresistor.
    the 4 relay outputs can be used for any function;
    two for raise/lower;
    and two more....?!

    Added after 24 [minutes]:

    A second solution could be to use a twilight automaton, e.g. AZ112, and two time relays, e.g. PCA512; function: delayed off (one=lowering, the other =lifting....
  • #5 14419807
    retrofood
    VIP Meritorious for electroda.pl
    Posts: 31317
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    Don't complicate things, it's very simple! To be done on two suitable relays, without additional components.
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  • #6 14420030
    azibik
    Level 32  
    Posts: 1950
    Help: 82
    Rate: 322
    Retrofood,I support simple and proven solutions,but how do you make a twilight switch on a relay ?

    Added after 1 [minute]:

    And the timer.
  • #7 14420058
    retrofood
    VIP Meritorious for electroda.pl
    Posts: 31317
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    azibik wrote:
    Retrofood,I support simple and proven solutions,but how do you make a twilight switch on a relay ?

    Added after 1 [minute]:

    And the timer.


    A twilight is purchased. With a relay. So more convenient and safer.
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  • #8 14420354
    azibik
    Level 32  
    Posts: 1950
    Help: 82
    Rate: 322
    Specify the type of twilight switch with adjustable threshold, closing of roller shutters/night/,opening of roller shutters /day/, independently of each other.
  • #9 14422246
    pafciowaw
    Automation specialist
    Posts: 2439
    Help: 480
    Rate: 365
    I am also curious about the solution ...kol retrofood...to the board ;)
  • #11 14422617
    pafciowaw
    Automation specialist
    Posts: 2439
    Help: 480
    Rate: 365
    And something like this:
    What kind of system to use for automatic raising and lowering of roller blinds in the house j
    On F&F components.
  • #12 14422888
    azibik
    Level 32  
    Posts: 1950
    Help: 82
    Rate: 322
    Further there is no independent adjustment of the thresholds,independently.
    These are typical twilight switches,switching defined by a potentiometer,switching fixed.

    Added after 1 [minute]:

    Same name,twilight switch not brightness switch./or together/
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