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2 servos, 2 movements, 1 channel

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Old 12-02-2005, 08:21 AM
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vicarh
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Default 2 servos, 2 movements, 1 channel

I am trying to create a contraption to drop skydivers. I want to set up a box with bay doors and a mechanism to release skydivers in a sequence. My idea is to use a "slow-down" device to reduce the speed of the servos. Connect one servo to the bay doors and the other to the release mechanism. When the channel switch is thrown the first servo will slowly rotate until the bay doors are opened. At the end the servo arm will press a micro switch which will disconnect power to the first servo and connect it to the second one which will then start rotating and slowly releasing each of the sky divers.

My problem is how to go back in reverse. The two servos cannot be placed next to each other so I have to come up with a way to connect the servos such that when I reverse the channel switch the second servo rotates in the opposite direction and at the end turn the first servo on such that the doors are closed. I cannot figure out the wiring. I have the feeling I could somehow use two micro switches to work in opposite directions...[sm=confused.gif]
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Old 12-02-2005, 09:28 AM
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viper1
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Default RE: 2 servos, 2 movements, 1 channel

More info please??? is channel proportional? how is it activated on tx, slider, 2- or 3 position switch?.
When you "go back in reverse", is it important that the servo's go in sequence or could they go back at the same time?
I might have had a similar problem before (I love gimmicks, most my planes use 10ch + )


A picture / drawing would help a lot....


Regards,
GJ
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Old 12-02-2005, 09:43 AM
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Default RE: 2 servos, 2 movements, 1 channel

GJ,

I want to make this as simple as possible so I thought of using a proportional 2 position switch. The idea is that I throw the switch and do not have to think of anything else, doors will open and skydivers/bombs will be released in sequence. When I flip the switch back release mechanism will move in reverse and doors will close.

I have thought of the follwing scenario:

Transmitter switch in closed position
• Bay doors closed
• Release mechanism closed
• Micro-switch 1 open feeding power to servo 1
• Micro-switch 2 closed feeding power to servo 1

Transmitter switch is moved to the open position
• Servo 1 moves until doors are fully opened
• Micro-switch 1 is closed cutting power to servo 1 and feeding servo 2
• Servo 2 starts moving
• Micro-switch 2 is opened cutting power to servo 1
• All skydivers/bombs released

Transmitter switch is moved to the closed position
• Servo 2 moves back
• Micro-switch 2 is closed cutting power to servo 2 and feeding servo 1
• Servo 1 starts moving
• Micro-switch 1 is opened cutting power to servo 2
• Bay doors are closed

Note: all power comes from a single channel.
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Old 12-02-2005, 10:04 AM
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Default RE: 2 servos, 2 movements, 1 channel

here is a diagram... both servos will have common (-) and signal wiring.
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Old 12-02-2005, 10:16 AM
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Default RE: 2 servos, 2 movements, 1 channel

Hi!
Could you simply use two "servo slow" units connected to one Rx channial via a Y-cable?
By programming the "servo slow" units with different times you will end up with a sequencing system.

Here is a link to such a unit: [link=http://ripmax.com/ProductFrames/P-RME2060.html]http://ripmax.com/ProductFrames/P-RME2060.html[/link]

/Red B.
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Old 12-02-2005, 11:01 AM
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Default RE: 2 servos, 2 movements, 1 channel

Red,

The problem with your idea is that no matter how much I slow down one of them, the other will start moving at the same time. What I want is to start the second sequence when the first one is finished. I figured that if I connect the slow-down device to the transmitter and then I connect the rest to it any servo connected will be slowed down. By using micro switches (see diagram) I might be able to start and stop the servos at diferent times.

When the first servo reaches the end it will press on the micro switch which will cut power to it and feed power to the other servo which in turn start moving slow because the slow down is in the way. I am going to buy some switches to experiment.
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Old 12-02-2005, 11:58 PM
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Default RE: 2 servos, 2 movements, 1 channel

What if:

you use only 1 micro switch in servo 2 lead (let's call it the "drop" servo) which is activated (closed) by servo 1 (doors) at the (near) open door position.

In other words:

- Both servo's in same position
- you flip the switch on tx, both servo's get the command to move, but only doors open (your "drop" servo is still disconnected by the micro switch)
- when the doors are almost open, the doors (or door-servo 1) activates the micro switch in servo 2, servo 2 (drop) will get power and moves to its position (command given earlier)


- flip the switch on TX to close, and both servos will close ( both servos are connected)
- You might have to experiment with timing, as you drop servo only has little time to go back when closing, as the switch will be opened again by doors soon after they start closing

Does that help?
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Old 12-03-2005, 07:59 AM
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Default RE: 2 servos, 2 movements, 1 channel

Viper,

I bought a couple of micro switches for experimentation and I am going to try it until I make it work.

Visited your website and have to say WOW, tremendous job... You eye for details is fantastic. Have entered any scale competition already?
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Old 12-03-2005, 03:52 PM
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Default RE: 2 servos, 2 movements, 1 channel

Or to make it really simple, use a 3 position switch on the TX. Bottom = closed and no skydivers. Middle = open door and no skydivers. Up = Skydivers jumping out. Back to middle = no more jumpers. Back to bottom = door closes. Put the servo slow on the jumper servo to space the jumpers.

Fritz
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