anyone know what the smallest and cheapest altimeter you can use with smaller estes rockets?.I think the smallest is 10mm? thanks
I saw that before,but it didn't help much.
hmm,the pico website does not work.I get google error "server not connected". adrel is in poland.prices are in euros and shipping must be crazy high.those are out,lol.
maybe jolly logic will come out with a smaller unit. I have the altimeter one.
My attempt to simplify it resulted in an extensive list of all currently available model rocket altimeters and their parameters, such as dimensions, weight, sensors being used, interfaces, pyro options, battery and voltage requirements, etc. All data was compiled from vendor datasheets and manuals. If it's something TRF community finds useful, I'd keep maintaining it.
Link: Model rocket altimeters: Comparison guide.
Now here's how you could help: I'm missing some data for few altimeters (look for question marks), mostly related to dimensions and recording functions. If you have one, measure it / post a file with a recorded flight, and I'll update the guide accordingly.
All comments (except negative ones) are welcome!
--Alex
https://RocketsEtc.com/
One data point that might be worth adding - support for staged rockets - my emails to @John Bean last week confirmed that the Altimeter3 will likely not understand a multi staged rocket... Given he's on the thread, he might be able to expand...
With a slight tweak to software, we could add "2 Stage Analysis." That would lengthen the list of stats shown in the app, and add a stat for interstage coast. Max speed would continue to be calculated and would presumably occur during second stage boost.
Indeed I am! (Arduino/BMP though, so no humidity)Hello!
I'm Rich and today is the first day I'm posting to the forums.
I'm interested in using off-the-shelf components to assemble flight instrumentation.
This past weekend I flew a Lance Delta with two (2) units to record the altitude profile; a RRC3 and a bme280 polled by a Raspberry Pi Zero.
The apogee readings agree to with approximately one (1) foot, at ~970 feet, the shape of the profile graphs also agree very well.
The big difference appears to be the RRC3 is recording data about twice as fast as the RPi.
I had the RPi programmed to poll the bme280 at 10/sec.
Next month I hope to fly a similar configuration to 3-4k feet.
Is anyone else experimenting with off-the-shelf components and specifically the bme280?
iirc there is supposed to be a Adrel dealer in the US, someone on TRF mentioned it not long ago.
Is anyone else experimenting with off-the-shelf components and specifically the bme280?
I was just looking at the Adrell ALT-BMP on their website. It states that "detection of takeoff" can be set for 2m - 100m.
Does that mean that you LOSE 2m of actual altitude ( minimum ) when the unit reports ?
Also, the unit measures 1 time per second . . . A second is a long time in a rocket !
https://www.adrel.com.pl/AltimeterBMP.html
Dave F.
View attachment 367338
Just noticed the reply on this relatively old query. Thanks for the tips.Bosch makes very high quality pressure sensors, and that's been mostly what Jolly Logic has used historically. They are digital and temperature-compensated (definite requirements these days), but you have to do a fair amount of math to turn the raw pressure and temperature output into temperature-compensated pressure, as you probably know by now. Other pressure sensors like those made by ST do all of that internally, rather than make you do it.
Whether you use Bosch parts or not, one tip is to convert all of your math to integer math rather than doing any floating point calculations (ever). No Jolly Logic products have ever used a floating point calculation on the altimeter (even when they show decimals on the screen). Floating point calcs are a huge waste of cycles and energy. Everything—even GPS coordinates—can be stored and calculated as integers, oftentimes MUCH more efficiently. Just a tip.
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