Variometer
4.7star
60 reviews
1K+
Downloads
Everyone
info
About this app
A software variometer. This application uses Kalman filter to estimate climb/descent rate from barometric sensor and accelerometer data. The estimation is displayed on a dial indicator, with optional sound indication. Does not need weather information to work.
Source code is avaliable on GitHub:
https://github.com/igorinov/variometer
Source code is avaliable on GitHub:
https://github.com/igorinov/variometer
Updated on
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Ratings and reviews
4.7
60 reviews
Garth D. Wiebe
- Flag inappropriate
October 16, 2020
The last update causes the app to hang after a half hour to an hour or so. This is on two different devices with two different versions of Android. I wish I had backed up the APK before updating! Now I can't go back. After hanging, we have to close and restart the app. My other criticism is lack of documentation. It is great to be able to adjust the parameters, but they are not intuitively obvious, and I am an engineer!
1 person found this review helpful
Ivan Gorinov
October 18, 2020
Thank you for reporting the problem! The only change in latest update was a bug fix in the smoother, which can be turned off by setting "Smoother lag" to 0. The free book by Roger R. Labbe may help to understand the Kalman filter parameters: https://github.com/rlabbe/Kalman-and-Bayesian-Filters-in-Python. Source code of this app is also on GitHub.
A Google user
- Flag inappropriate
December 1, 2019
Excellent. In IVSI mode it responds instantly. Have not tried it in flight yet. The "samples" setting is supposed to allow you to trade off response time (lag) vs smoothness, but doesn't seem to do anything at all (at least in IVSI mode). Even so, 5 stars.
1 person found this review helpful
Ivan Gorinov
August 13, 2020
Thank you for your positive review! Now the smoothing filter is working.
David Bostock
- Flag inappropriate
August 11, 2022
This app requires 3 position calibration of accelerometers. Probably good for most users. I was trying to find something indicating small changes in air pressure. My phone does have a barometer sensor, but I've no idea yet how sensitive it is.
