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I want to make an electronic bird feeder in which the feeder floor tips 30 degree down to exhaust the used seeds. I know how to work with PIC micro controllers to do the timing and enabling an output, my problem is: How to make the bird feeder floor or cup floor (made from plastic) move 30 degree down and then up?

I have researched and I found that to make the thing move I should use an motor but I could not find an appropriate one. Is here an appropriate technique that I should use?

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closed as off-topic by Scott Seidman, Joe Hass, Chetan Bhargava, Daniel Grillo, m.Alin May 19 at 13:24

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What kinds of motors do you know about? Why weren't the motors you found appropriate? –  David May 18 at 14:30
4  
This question appears to be off-topic because it is about mechanics –  Scott Seidman May 18 at 22:04

2 Answers 2

If the plastic "floor" of the bird feeder is not too big and the fairly light weight you may very well be able to make this work as follows.

First hinge one edge of the "floor" to the corresponding side of the bird feeder framework.

Next create a linkage rod that connects to the "floor" away from the hinge that will be suitable for pushing the floor between its two positions. With appropriate design considerations and placement of the linkage rod you can connect its opposite end to a hobby servo that is equipped with a lever arm. Here is a picture of the servo device.

enter image description here

Control of the servo is done by feeding it a pulse train that changes in width according to the lever position you wish to attain. For a typical servo the pulse train would be a 30 to 50Hz waveform with the high time of the waveform ranging from 1 to 2msec pulse width.

Most servos operate with a voltage from 5 to 6 volts and the control signal swinging from 0 to 5V.

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If you're willing to accept 25 or 35 degrees instead of 30, you're in luck. What you want is called a rotary solenoid. See, for instance, http://www.ledex.com/rotary-solenoid/ Also, these are readily available on eBay. You'll need a solenoid driver, of course, but that has been covered repeatedly on other threads.

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Unfortunately i live in a dark side of the world and eBay and other major online distributor don't offer any service in our country :).could you suggest any common model. –  user3649714 May 18 at 14:42
    
Does this mean that no one can mail a package to you? –  WhatRoughBeast May 18 at 17:53
    
Yes sir,we are under USA sanctions and they don't deliver any thing to us :).my best shot is something look like this website roboeq.ir/products/category/53. –  user3649714 May 18 at 18:02
    
If you are in Iran I know for a fact that you can get RC servos like in Michael's answer in Iran. Also, most electronics can be sourced from China. Check out aliexpress.com or hobbyking.com if you're OK with buying online. –  slebetman May 19 at 8:53
    
@slebetman i check those two website their activity in our country is illegal,there is no way to buy theme online, i think i should search in the shops. –  user3649714 May 19 at 10:09

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