Hi dear experts ! I am writing to ask you for an advice. Maybe 2 or 3 . I am trying to do an automatic puller from my curtains but I am not so sure what to use.
First, I tried using 3-6V motors with 10000 rpm but it is to much and it breaks the thread. The I remember I had an N20 motor liyng around and I use it and this time it worked perfectly, but very slow. Side note:both motor were power directly by 6V batteries.
I calculated the duration to do a full spin and it takes 1,5 seconds that means 40 rpm(and this rpm exist for this motor).
I don't know for sure, if in your opinion the N20 motor is good, what rpm should it have if I buy 4 of them ( because there are 2 curtains and I whant to control them by voice, separately).
Another thing is that I don't know what bridge for controlling this 4 motors is better and what board is the best (but I think the last one isn't a big problem, if the motor bridge is a shield for the Uno, obviously).
I hear that the Pico it is better but I have not tested yet because I didn't find it in stock. What do you think about this, too and what do you recomand me for this project(now I find the Pico H, with the pins soldered)
These motors are available with various gearbox ratios. Knowing how long pulling the curtains takes to open/close with the motor you have, and what gear ratio it has, you should be able to figure out what gear ratio you need to open/close in a time that's acceptable for you. Buy one motor with that ratio and test it before you buy 3 more.
That is fine, but you know you can't just turn the motor on for that time, because it will drift the absolute position of the chord. You need a sensor at each end of the chord to detect when it has reached the right point to know when to turn off the motor.
Thereby making a private request for support. As I have said, you have sent numerous messages, taking up my work time, I told you that my time was chargeable, and you sent more massages taking up more of my time!
For my curtain puller I bought a cheap cordless screwdriver, which has a reasonable motor, inbuilt gearing and is quite compact.
You can't safely stall such a motor without breaking something (they develop a lot of torque) so I used two sensors to tell the motor to stop. They were simple: I used monofilament fishing line for the cord and attached two of the little "lead" balls in the appropriate places. I then got a couple of microswitches and fitted a small hoop to their operating levers, such that the fishing line could pass through freely, but the lead ball would catch on the hoop and operate the microswitch. I arranged them such that one microswitch operated when the curtains were fully drawn, and the other when they were fully open.
Altogether I used one cordless drill, a six inch rule (bracket for the motor), two pulleys, two microswitches, some fishing line with "lead" balls, and a PIC. Back then I used relays to operate the motor - I'd use a standard motor driver nowadays.
I am a kid passionate about robotics, electronics and Informatics. I don't work, the law doesn't let me so I can't pay you. Thank you for everything I won't disturb you at all
. I am trying to do an automatic puller from my curtains but I am not so sure what to use.