Wanting to have a motorized blinds connected to my smart home and never have it done before I would like to double check several potentially obvious questions...
First of all, the blinds manufacturer suggests installing blinds with motor DV24DH/L (most likely Dooya: dv24dh.png) with the power source of 12 V 2 A and a mechanical switch (marked as DC126, DC127, DC128 in their manuals) that, according to the pictures, reverses input polarity (3-way switch with 6 total contacts, visible at the top of [similar motor manual]). I have found international version of the manual of the similar motor DM25DB for more information.
My goal is to open/close/stop blinds using NodeMCU or similar.
Is it correct that this is a really DC motor where you controls the rotation direction applying input from the power source in straight and reversed polarity? Is there any visible signs except of two-wire motor input and mechanical switch that obviously reverses input?
If yes, can it be controlled with two SPDT relay, as shown in this answer?
Any drawbacks of controlling this motor with a L298N?
L298N cons I see:
- I know it has ~2 V drop so the motor will be powered with 10 V instead of 12 from the original power source, and it is unknown whether internal motor electronics (assuming there is something inside except the motor to provide end-stop and resistance-stop functions) may not work properly from 10 V. Is it safe to replace the original power source with a LED strip transformer that should have adjustable 12-14 V 2 A output and use it with 14 V?
L298N pros I see:
- From what I see in the datasheet it takes care of the delay during direction switching and back EMF in L298N module with diodes, something that I should probably do separately with SPDT relay.
Any questions and suggestions are appreciated.