In this article I will explain a simple curtain controller circuit designed by me which can be used to control the opening and closing of a curtain through a remote control.
Overview
Referring to the circuit diagram in your screen, we can see there are just two relays employed for implementing a remote controlled opening and closing of a curtain.
The best feature of this circuit is that it does depend on any limit switches at the start and the end of the curtain mechanism.
The curtain can be moved in a forward closing direction, or in the reverse opening direction, simply by pressing the relevant push button switches of the remote handset.
The curtain keeps moving as long as the user keeps the relevant remote handset button pressed and stops as soon as the push button is released.
Since there are no limit switches used in this design, it is important that the user releases the push button and stops the motor whenever the curtain reaches its extreme ends, just to ensure that the motor is not unnecessarily overloaded.
How the Circuit Works
If you do not want to read the whole explanation, you can watch the following video instead:
Now let's understand how the circuit is designed to work.
In this design we have used a standard 2 channel, RF 433 Mega-Hertz remote control module, in which the receiver module contains two SPDT relays and the remote handset contains two push buttons. An example model of the remote control units is shown in the following image.
The two push buttons on the remote handset control the operation of the two relays on the receiver unit.
In our circuit diagram, on the left side we can see the two SPDT relays of the remote control receiver module. The N-O contacts of the two relays are connected to +12 volt DC supply. The common pole of the two relays are used to supply +12 Volt DC to the motor control relays of the system which consists of one SPDT relay and one DPDT relay.
Using a network of 3 1N4007 diodes, the switching supply from the two SPDT relays are arranged such that one of the remote receiver relays operate both the SPDT and the DPDT relays together, while the other remote relay operates only the SPDT relay of the system.
The DPDT relay basically controls the reverse-forward motion of the curtain motor, while the SPDT relay is used for toggling the +12 volt to the motor.
Overall, the system ensures that the curtain motor can be operated suitably by pressing the relevant remote control buttons either to move the control towards the closing end of the mechanism or the opening end of the mechanism.
The system also allows the motor to curtain to move and stop at any desired point of its travel, which means that you can open or close the curtain at 10%, 20%, 50%, 70% or at any other desired range.
So, that's it friends, this concludes our article on a simple remote controlled, curtain open-close circuit. If you have any related questions or doubts, please feel free to use the comment box below to ask them.
hello sir,
hope all is going well, sir i need your support. i want to make wireless door bell with rf, same module you guide in this article, i have china music door bell chipKD9561, i tried but its not working properly, once i connect speaker rf signal gone. bell sound not coming properly, can you guide me how to make wirelss door bell with rf plz.
Thank you Ghulam,
Please post your above question under the following article, i will try to solve it for you…
https://www.homemade-circuits.com/making-wireless-doorbell-circuit/
also in that circut what i guess, if i press 5 time reverse butten, in between 2 time its goes forward, what is the reason sir?
If you are pressing reverse button and the motor is sometime changing its direction it means the other “forward” relay is also getting activated due to some mistake in your remote control.
As long as you are pressing the reverse/forward command relays separately, this problem can never arise.
The problem can happen only if the command relays are getting activated together or in an incorrect way.
It seems your remote receiver circuit is still not stable.
hi sir,
sir can you send me diagram for both spdt relays with remote connectivity plz as you said, for future because dpdt relay availbilty is difficult. thank you
Hi Ghulam, I will try to update the circuit within a couple of days.
sorry sir it was my mistake, now its working, thank you so much sir, hope now it will work properly. thank you sir
That’s great Ghulam! Check it thoroughly and let me know if you have any further problems!
sir i guess at first start its ok, but after that its like before, i connected in4148 at supply of receiver part, and 1uf acros moter, 1000uf at relay coil of receiver remote, but not working smothly,
sir remote both relays giving positive, may be due to this its happen, plz guide and suggest
Ghulam, I told to connect 1000uf across the supply terminals of the remote board….not across relay coil.
Yes, both relays are supposed to produce positive voltage when they are activated.
hi sir,
sir i tried with 15 volt 3 amp adopter, with this forward is ok, but for reverse once moter move to reverse then imidiatly move to forward, its with remote, but when i remove remote circut, with push button working perfect, hope you got it my point.
Hi Ghulam,
I think the problem is happening due to the spikes and transients generated by the motor which is causing interference with the sensitive remote circuit, causing the relays to operate erratically.
Please do the following things and check if it improves the situation or not.
Add a 1uF non-polar capacitor across the motor wires.
Connect a 1N4148 diode across the +/- supply terminals of the remote receiver circuit…anode to ground, cathode to positive.
Connect a 1000uF capacitor across the +/- supply terminals of the remote receiver circuit.
Connect a 0.1uF capacitor across the +/- supply terminals of the remote receiver circuit.
Let me know how t goes.
sir if i am giving seperate power supply to moter relays then its working with remote properly, if i give 12 volt from remote circut, other connections same only moter spdt relay NO attaching with remote and gnd to gnd then while pressing remote butten relay flickering. sir why its doing like this?
Hi Ghulam, please make sure your power supply is rated with sufficient current to drive the motor and the relays, and please add a large capacitor parallel to the remote control relay coils, and remove any LEDs if you have connected with the remote relays…
sir i tried as you guide, remote relays no point of both relays are joint and connected with NO point of moter spdt relay, and NO is connected with positive. remote relays commen is connected with diode like the other commen also same connection, as per diagram. once i press remote butten, moter spdt relay flicker, if i use seperatly without remote, its working with pish buttons. what is the reason sir? as i told you before i connected 12 volt led with remote relay, and its on with remote, when relase button led off.
Ghulam, the relay contacts on your remote receiver will work exactly like push button, because the relay contacts are also like ON/OFF switches.
Please check the connections of your remote relay and verify the ON/OFF action with a voltmeter.
When you press the remote button, the common pole will connect with the NO contact and the 12V from the NO contact will pass through the common pole into the diode configuration of the circuit.
sir for remote i combine both relays NO points and give positive and connected with NO point of motor spdt relay, and remote both relays NC connected with diode as per diagram, but not working, remote circuit relays common is empty, plz guide me remote circuit connectivity with push buttons of motor spdt relay,
its working without remote circuit with push buttons, once i give power to remote circuit, i checked remote circuit its working with 12 volts leds, when i press remote button led on, if leave remote button led off with both side…..
Ghulam, you must connect the common terminal of the remote relays with the diodes of the circuit, not the NC contacts….the NC contacts of the remote relays have no connections, they must be empty.
For push-button operations, connect the push buttons in parallel with the NO/common pins of the remote relays, meaning one terminal of the push button will connect with NO pin and the other terminal with the COMMON pin of the remote relay…same connections for the other relay and push button…
yes sir its working now, problem was in dpdt relay connectivity, now its fine, its working with push buttons, i want both option, like with buttons and also remote, for remote as you guide, both NO are common, and NC of both relays should be connected with push buttons, am i right sir?
i am sorry for disturbing you too much, and thanks for your kind response, thank you sir
sir i tried with spdt and dpdt relys as per diagram, i connected push butten for testing. once i pressed forward butten its ok but while pressed reverse butten its short, like negative wire goes heat, however i have both relays, spdt and dpdt, which is easy plz guide me with orginal picture of relays with connectivity plz
Ghulam, getting a short circuit is impossible in this diagram, according to my analysis.
short circuit can happen only if the DPDT relay is wired incorrectly.
Without seeing the images and pinout details of your relays, it won’t be possible for me to provide the exact wiring information.
thank you sir for shaering important article for me, i am trying this project for me i m trying to understand which pins are used for connect of remote module relay to dpdt 8pin relay, can you show me connectivity with original picture of remote relays and dpdt relay plz
Thanks Ghulam, instead of a DPDT we can replace it with two SPDT relays, that means there will be now 3 SPDT relays for the motor control.
5 pin SPDT relays are easily available, so you can get it easily.
Let me know if it is ok for you…