Altimeter and servo release

[legranddudu]

Friends,

I need a recommendation: which US altimeter can also "pilot" a servo release device? Using standard connectors from the RC world.

I would also appreciate any feedback/experience and potentially pictures from a real setup.

Thx

Denis

 

[cerving]

The Eggtimer can do it, it's a dual-deployment recording flight computer kit, and it's only $40 including the USB data cable. www.eggtimerrocketry.com

 

[Onebadhawk]

Awwwww Cris you beat me too it...........

Denis, I know enough about you from dealing with you and from reading your build threads........
Your extremely meticulous and careful in your work / builds........
If you give an Eggtimer a try I promise you won't regret it........
It will absolutely operate a servo.........
If you had told me this I would have thrown a servo in the box with the cords...........
Assembling the Eggtimer isn't anywhere near as bad as I thought it would be......
I bet it won't even take you long,,,,, an hour or two......
This is the most capable altimeter I've ever dealt with.......
Customer service is tops with Cris Erving.........
If you need help in any way,,,he's right there.........
Denis, I hope this means something coming from me,,,,,,,
I'm telling you,,,give Eggtimer a try........ you will absolutely love it.........
Buy a two fer,,,,,you can't beat the bang for the buck............

Teddy

 

[legranddudu]

Ok the eggtimer seems to be one solution, another friends told me about the Altacc..cannot find anything on servo connectivity. Any idea anyone? What about the new ones ffrom Adrian or the Rrc3, any developments coming in that direction?

appreciate your answers with lot of attention...

denis

 

[Onebadhawk]

I won't swear to this Denis,,,,,,,
but somewhere along the lines I think I heard or read
that the RRC3 will operate a servo.........
Not sure..........

Teddy

 

[troj]

A servo requires a pulsed output. Most altimeters are not design to do so


Off the shelf, I suspect the EggTimer may be your only option

 

[jderimig]

What exactly do you want the servo to do per the event?

 

[Onebadhawk]

If it wasn't so late I'd call Tim or Jim Amos
and ask them to respond to this thread...............

Teddy

 

[MWC]

What about the new ones ffrom Adrian or the Rrc3, any developments coming in that direction?
denis

Currently the RRC3 does not support servo control.
The PWM required for servos would be a natural extension of the pyro expansion board I am planning however.
I will in fact consider this operation as part of the board design.

 

[legranddudu]

John, the servo releases the main in a serial dual deployment design...

What exactly do you want the servo to do per the event?

 

[legranddudu]

Dear "MWC"... I had a look at your page..obviously a combination of your RRC3 and the WRC+ as security device sounds really good to me.
Nevertheless 2 questions:

- any idea when you would provide the servo release module?
- do you use Kalman filters?

Thx & regards from old Europe...
Denis

Currently the RRC3 does not support servo control.
The PWM required for servos would be a natural extension of the pyro expansion board I am planning however.
I will in fact consider this operation as part of the board design.

 

[jderimig]

John, the servo releases the main in a serial dual deployment design...

View attachment 141105

Sorry I should have been more specific. What is the servo motion profile you want when the event triggers? Or do you want that programmable as well?

 

[cerving]

Do you want both the drogue and main to be servo-controlled?

The Eggtimer supports servos for both drogue and main, you can control both the direction of the servos and the amount of travel independently. The drogue is tripped one second after apogee as determined by the filters, or you can set it to be triggered by a timer just like a standard motor ejection delay/charge. The main can be programmed to deploy at 50' to 2000' in 50' increments. Mach-lockout is automatic, it's activated once the filtered velocity exceeds 500 ft/sec (about 150 m/sec), and prevents deployments until the velocity has slowed down below 100 ft/sec (30 m/sec) for over one second.

 

[MWC]

Nevertheless 2 questions:
Denis

1. Several other projects in process... another 3 months minimum
2. No, FIR filter and velocity lockout

 

[thomas]

If you want an additional servo release control module you could use the spacetec servo control.

Regarding the WRC+ the 900Mhz Band is reserved for GSM/UMTS in germany.

We had a discussion on the Telemetrum list, about controling a servo.

 

[Manutoba]

Its not US made, but why not use the Altimax you used before? It is very reliable and has 2 dedicated servo ports.

But you should check your ebay design, as I can see from your pictures it is directly connected to the pressurized chute compartment, that will damage every barometric altimeter! Normal pressure sensors can withstand 5 bars overpressure, which is easy to achive. Also, you have a pressure connection to the vent outlet of your hybrid tank, which can fool a barometric altimeter too. On venting the pressure in the compartment will rise, as soon as you lift off it will set this higher pressure as launch pressure, after venting is over the pressure will suddenly drop, resulting in an early deployment.

Peter

 

[legranddudu]

Peter, i am not sure who you are (please complete your profile and introduce yourself first as a minimum) and what you are talking about. Please read my cowabunga construction thread first. You shall also check the contrail homepage for better understanding of their hybrids, how they work and setup. This thread is not dedicated to german altimeters but to the alternatives on the USA market for servo control.

 

[cerving]

The web makes the world a very small place... I've sold quite a few Eggtimers to Australia, where they fly a lot of hybrids due to AP restrictions.

I would imagine that if a US flyer wanted an Altimax, they could order one too... I went to one of their dealer's web site (www.rebelrocketry.com) and I would be surprised if they couldn't ship to the US. It looks like an interesting unit, it's like a cross between a Raven and a RRC3.

 

[Manutoba]

Please read my cowabunga construction thread first.

That's what I did, please read the last posting there: The Servo Release is not gas tight. Just a hint, because you got problems on the last flight.

Peter.

PS: I wanted to edit my profile, but I couldn't, the system does not let me..

 

[Reinhard]

PS: I wanted to edit my profile, but I couldn't, the system does not let me..

This is an anti-spam feature of the forum. When you have more postings (I don't know how much), you can edit your profile. Alternatively, you could ask the moderators for help.

Reinhard

 

[ksaves2]

The E.T.'s are a very easy build. I downloaded the build photos to a laptop and matched the pictures. Would take 3 hours the first time and less for the next one.