I recently found out I'd need to pay upwards of $2k in order to supply my entire house with automated blinds. I feel like I can definitely do it myself for a fraction of the cost.
For this purpose I'm looking into what would be the cheapest way of powering small 2W/3W 12V/24V motors like those ones, which are pretty easy to get a hold of for a couple of bucks:
I stumbled across this video, which shows something like this:
Yes, I replaced the motor with a bulb because I couldn't find a symbol for it, sorry.
As far as I understand, the diode will chop it into a half wave, and the resistor will limit the current to:
$$ 220 / 1.414 / 2 / 1000000 = 77 uA $$
Which would probably not be enough to do any work, but let's say I can replace the resistor with a 500 ohm one to get around 155mA, or whatever other value it needs to be in case my calculations are incorrect.
Yes, I'm aware that the produced voltage will not be DC but it should be OK as in it won't introduce damage the motor, and yes, I will need to add a couple of relays between the motor and diode/resistor to be able to switch the direction. I'm really just looking for the cheapest working solution.
I'm not sure what the purpose of the capacitor is and what its value has to be.