IR arduino automatic blinds.

Hi there, I want to start a project with the arduino but first need to ask about motor sizes. Will need 2 12v motors be to strong for sliding and turning the blinds or will 2 lower volt motors work? and also If i need two 12v motors i will then need the "dual motor shield" but if i use two smaller motors then i will only need the single motor shield. is that correct?

Motor voltage does not necessarily predict motor power (torque). A 12V motor could be a total loser and a 6V motor could twist your arm off.

well then.i will do more research on my end. I found a post of someone doing the same thing but with sun detector for opening and closing so hopefully they can shed some light(ha) on what they went with.

would anyone have a suggestion on what motor to use that has more experience? i really don't think it will take much.

jadonv: would anyone have a suggestion on what motor to use that has more experience? i really don't think it will take much.

Perhaps big blinds, big motor, small blinds, small motor, medium blinds, medium motor.

sorry, other then making an ada-light with an uno, i am completely new to any builds. so when you mean big medium small i wouldnt have a clue where to start... but what ive learned so far that i will need two bi directional motors. hopefully ones that will work with motor shield so that it will allow me to set different motor speeds. all i need to know is what motors would be strong enough(while being quite).. and then if its compatible with the motor shield. its a 30 vertical blind system and the track is about 7 feet long.. i need to be able to rotate both the sliding cord and the rotating cord in both directions.

Some previous post.

https://www.google.com/search?hl=en&as_q=blinds&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=http%3A%2F%2Farduino.cc%2Fforum%2F&as_occt=any&safe=images&tbs=&as_filetype=&as_rights=

What I am going to suggest is that since there are so many choices, the size and type of mount is going to be important to you. Just about any motor with a worm-gear drive would at least equal the amount of strength your hand needs to move these. Sliding them could possibly need a bit more power. Without measuring the amount of force required, you are going to need to take a pot-shot at it. There are also several ways to amplify force and use a smaller motor.

Let's see some pictures of the blinds where the motor will be actuating.

jadonv: would anyone have a suggestion on what motor to use that has more experience? i really don't think it will take much.

After trying a few alternatives, I ended up with a relatively small motor (2-12V operating range with about 0.5W power consumption) with an integral 231:1 epicyclic gearbox to drop the speed and increase the torque. The motor is physically tiny but does the job easily. It hardly takes any current (I estimated less than 100mA) so it's easily powered from a wall wart which also powers the Baby Orangutan with integrated H-bridge driver.

This is just to rotate the slats on a vertical blind system abut six feet long. Your blinds/curtains could easily be bigger/heavier and need a more powerful solution, but that might give you some idea where to start your testing.

Back in the day I operated the slats on a small window blind with a servo.

http://web.comporium.net/~shb/blindtilt.htm

https://docs.google.com/file/d/0B3mRTzjl6p_9NXV3WEREMVFXRVU/edit?usp=sharing https://docs.google.com/file/d/0B3mRTzjl6p_9bllFaXVvck5KVEU/edit?usp=sharing https://docs.google.com/file/d/0B3mRTzjl6p_9akI0QlIxRmhlaDA/edit?usp=sharing

ok heres what im working with.. thanks for you posts

Those pictures aren't working

try now?

jadonv: try now?

"You need permission to access this item."

sorry fixed..

PeterH:

jadonv: would anyone have a suggestion on what motor to use that has more experience? i really don't think it will take much.

After trying a few alternatives, I ended up with a relatively small motor (2-12V operating range with about 0.5W power consumption) with an integral 231:1 epicyclic gearbox to drop the speed and increase the torque. The motor is physically tiny but does the job easily. It hardly takes any current (I estimated less than 100mA) so it's easily powered from a wall wart which also powers the Baby Orangutan with integrated H-bridge driver.

This is just to rotate the slats on a vertical blind system abut six feet long. Your blinds/curtains could easily be bigger/heavier and need a more powerful solution, but that might give you some idea where to start your testing.

Do you mind finding a link to the motor and gear box your referring too..

Unless you are watching the blinds while they are operated, how will you know what position they are in and when to stop the motors?

jadonv: Do you mind finding a link to the motor and gear box your referring too..

http://www.maplin.co.uk/media/pdfs/Epicyclic%20specifications.pdf

The one I use is part number 941D2311.

Perhaps a stepper motor would be appropriate for this. Lots of torque and you would know the position. You don’t need any holding torque, so they should be fine without gears even.

yes i was looking at the 12v step motors.. so if i went with those.(which i think i will) i will have to purchase the dual motor shield correct?