Smallest data logger??

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Rex Fynns
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Smallest data logger??

Postby Rex Fynns » Tue Jan 16, 2018 6:26 pm

G'day,

Hope everyone had great festive season.

I appear to have reached the G limit (23g) of the little Jolly logic altimeter 2 which results in scrubbing any useable data from the g sensing side ie. speed up and down, apogee eject etc.

I am using a 24mm dia. body so cannot incline the Jolly Logic to take advantage of its higher G range when inclined and using an average of all 3 of its 3 axis imu's, I'm stuck with using just the one vertical axis sensor.

Searching the web I can't seem to find a data logger which records the same data as a altimeter 2 and is of similar small size and can cope with ~ 50g.

Anybody able to offer any help or thoughts?

Regards
Rex

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kopius
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Re: Smallest data logger??

Postby kopius » Wed Jan 17, 2018 6:50 am

Raven3 fits inside a 24mm air frame. https://ausrocketry.com.au/raven-3-70g.html


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SpaceManMat
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Re: Smallest data logger??

Postby SpaceManMat » Wed Jan 17, 2018 9:09 am

It’s pretty hard to beat a Raven 3 for size and functionality. A very good investment IMO.
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drew
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Re: Smallest data logger??

Postby drew » Wed Jan 17, 2018 10:23 am

If you're just looking for accurate apogee data you might want to look into AltusMetrum's MicroPeak.

http://altusmetrum.org/MicroPeak/

FYI, it's a baro only altimeter so there's no accelerometer but realistically a baro sensor will on average produce more accurate apogee data when compared to an accelerometer. It also requires the MicroPeakUSB to download data and they appear out of stock.

It's certainly tiny though.
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drew
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Re: Smallest data logger??

Postby drew » Wed Jan 17, 2018 1:45 pm

Rex Fynns wrote:I appear to have reached the G limit (23g) of the little Jolly logic altimeter 2 which results in scrubbing any useable data from the g sensing side ie. speed up and down, apogee eject etc.


The AltimeterTwo web site states the following...

Maximum of 40 gees (careful mounting)


Have you investigated that avenue? It seems like you should still be able to get data up to 40 G with the unit, at least according to the manufacturer.

https://www.jollylogic.com/products/altimetertwo/
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OverTheTop
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Re: Smallest data logger??

Postby OverTheTop » Tue Jan 23, 2018 4:32 pm

Ravens immediately sprung to my mind. Great little units. They are good to 70G.

They used to do a 250G unit but to get that functionality nowadays you need to change out the accelerometer device for the higher accel unit (but get reduced resolution as a tradeoff). I am in the process of doing that currently.
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