Electronic device to change angle of attachment. - Page 1
Forum section: electronics / beginners

author: TNb
author_rank: Regular Contributor
timestamp: April 28, 2014, 02:34:31 am
content: Hi! Maybe it is noob question, but I can't think or google way to change angle of some thing.Better explain in example:I need a thing that works basically as DC motor, it has attachment to it(example - thin long plate), but it does not rotate it endlessly and fast, but rather just doing a small step and stops.Like in this picture - I have initial position, then I turn "this thing" on and it goes for specific position and stops.I suppose there is a way to make it with a DC motor by just applying small voltage to it for specific time period, but i wonder is there device that does this in more easy way? Or maybe some famous circuit for DC motor that does that?The reason why I don't want to mess around with motor because I need a small component, not this huge metal box, it just takes too much room.I wonder how they make flaps in the radio controlled planes, they might use some clever thing, but I can't access one to see what's inside.Thanks

author: houdini
author_rank: Regular Contributor
timestamp: April 28, 2014, 02:36:33 am
content: A servo?

author: TNb
author_rank: Regular Contributor
timestamp: April 28, 2014, 02:40:31 am
content: hm... thanks, didn't know about thembut they are quite huge also from what I see in google...

author: miguelvp
author_rank: Super Contributor
timestamp: April 28, 2014, 02:51:22 am
content: Quote from: TNb on April 28, 2014, 02:40:31 amTry appending mini or micro in front of servoOr even ultra micro and sub micro

author: pickle9000
author_rank: Super Contributor
timestamp: April 28, 2014, 02:54:08 am
content: How heavy is the item you want to move and how far (degrees)?

author: Richard Crowley
author_rank: Super Contributor
timestamp: April 28, 2014, 03:03:55 am
content: How heavy is the load?How fast does it have to move?How accurate does it need to be?Does it need to be weatherproof (is it outdoors)?Does it need to have the complete 90-degree range of motion?How many different pre-set positions?How do you want to "calibrate" the positions?Many of these questions would likely be clearer with a more complete explanation of what you are trying to do.Obscuring the details by making this into a generic question limits the usefulness of our responses.

author: Frink42
author_rank: Newbie
timestamp: April 28, 2014, 12:09:42 pm
content: The "9g" servo is a common servo, used by hobbyists, thus really small (google "9g servo" and you'll find it)If you want extreme precision, you might need a "stepper" motorNote that the servo is driven using PWM: the duty cycle effectively sets the position.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 28, 2014, 02:26:12 pm
content: Also such things as ratcheting solenoids (a ratchet and pawl holds it in place without requiring power), and, whatever other kinds of levers and pulleys and whatnot you might attach to a solenoid or motor.Tim

author: kolbep
author_rank: Frequent Contributor
timestamp: April 28, 2014, 03:12:08 pm
content: Rip a stepper motor out of old printers, copiers, ancient harddrives, etc.If you get get a 6 wire stepper, you can easily drive it with a pic or other micro, you will just need a uln2003 darlington array chip to interface.Each time you energize it in the right sequence, it moves a certain amount of degrees, then stops.But if you want repeatable positioning, you will need a hall or optical sensor, then when you start the system, the stepper must run back until this sensor sees it. You can then count your steps, so that you know your angle at any time.

author: TNb
author_rank: Regular Contributor
timestamp: April 29, 2014, 03:15:40 am
content: Quote from: miguelvp on April 28, 2014, 02:51:22 amI did, but micro servos are also quite bulky, like 2-3 cm... anyway, managed to find one 1 cm, not badThanks everyone, happy to know about servos now