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Apogee has a log sheet that was developed as we were beta testing the AltimeterTwo, so it was developed to work well with the AltimeterTwo.
It may be overkill if you're not using an AltimeterTwo and...

One hour.

Competition is a good thing. The more people who get interested in altimeters, the better it is for rocketry and, by extension, Jolly Logic.
I'm glad they took our cues on design direction toward...

Nope, I'm not involved with Estes' project. We've had talks, but they never progressed very far.
I wish them the best of luck. I probably would have bought one three or four years ago rather than...

You can see a video of vent ports on Apogee's site here. In the video, the ports are in a plastic payload section, but you can see the relative size and placement of them.

Vent holes aren't that...

In my opinion, the most important thing is the time you and your son spend talking and working together. It's precious and it goes by so fast.

Welcome!

When you're flying minimum diameter, it's always a kind, thoughtful gesture to have an easy-to-remove motor case for whoever finds it.

It's actually 7 twelve-minute episodes, to be released online.
Check out http://insidetv.ew.com/2012/11/05/battlestar-galactica-prequel-date/
Less than six months to Star Trek, too.

At a recent trade show I held a contest where attendees cupped one of our altimeters in their hands and tried to simulate as close as possible to 1600 meters (it was an Olympics theme) of altitude....

P.S. the challenge with a BS2 will be limitations on how fast it can process data, that's probably the only downside to using that. I've used them (very fun) for non-real-time things with buttons and...

I'd be happy to give you advice if you run into difficulties with things like I2C, SPI, or choosing components. My first advice would be to choose 3-axis parts (you need them all, trust me), and...

Cerving,
Yep, I think most altimeters update their "ground pressure" as they sit there, and you're right: it's not likely to be significant over a few minutes' time.

Yep, normal weather swings have magnitudes of hundreds of feet of pressure altitude. You can find graphs of pressure histories recorded from weather stations, then convert these to altitudes using...

There are a number of factors which affect accuracy. Just to further the discussion for those who are into this sort of thing:
1. Discrepancy between ambient pressure outside the rocket and in the...

You should use vent ports if it's riding with the chute, or else you'll just get ejection altitude. If it's In a payload section that never opens, you need ports no matter what. The pressure sensor...

Nice project. Some tools/tips, in case they are helpful:
1. Try a $40 toaster oven for soldering (more uniform heating)
2. Get a thermo probe lead for your multimeter to judge the end of the...

It's a really good idea to listen to "rules of thumb" from those who have done a lot of board designing and production. If you get into some good habits while you're designing the circuit and laying...

Ring Leader,
The way it's shaping up now, gyros will be an option on most (if not all) future Jolly Logic products. You are right that they are tiny, and now (relatively) cheap. However, chip gyros...

Jeff,
Could flight trajectory be the cause of flying lower than sim? I've seen swings of 40% between a straight up flight versus an arcing one...

Nice work on that diagram!

Clay,
Yep, we don't use the 3-axis accelerometer for altitude, but it's the rotation (not lateral acceleration) that's the issue.

It will be interesting to see in future products how much...

Logan,
Hi, there. Mind if I offer my viewpoint?

I should say upfront that I'm the creator of the AltimeterOne and AltimeterTwo, which (by the way) I designed for teaching my *own* kids about...

No matter what you make them out of, they need cleaning every so often. Hard to beat stainless for standing up to some good scrubbing...

I'll post more images soon. Maybe the next one will be a flight graph on an Android tablet. For instance, I recently got a Nexus 7 tablet, and have found that the form factor is more convenient for...

Very cool. Thanks for the link to that blog.
In a similar vein, I very much have enjoyed my copy of Jack Hagerty and Jon C. Rogers' Spaceship Handbook.
Jack is member of the NAR chapter where I...

Usually what I consider are:
1. Safety first (will deployment work well)
2. Accuracy (will the payload see anomalous high/low pressure, or time lags)
Seems like you're okay with both, assuming you...

I like to drill holes and expose the tips of flashing LEDs from payloads to let me know my electronics are up and running when I'm launching lots of altimeters during testing. I just quickly...

Please keep the input coming. It's truly appreciated.

At this point, it seems that there's a lot of interest in using your iPhones out in the field, so I will share the below snapshot with you, as...

Jolly Logic has an upcoming set of products that interact with Jolly Logic web applications on phones, tablets, and computers. If you think you might be interested in flight electronics that allow...