EDsteve

// Original code by Rolf R Bakke,  Oct 2012, 
// Modified May 2017 by Thomas Gilson. tbgilson@gmail.com
// code is for the arduino pro/pro mini, using MS5611 barometer and speaker on pin 2.
// can be hooked up to a button for different mode changes on the "fly" (he he).
// made especially for paragliders. 
// before using this, you should know roughly what your min sink rate will be.
// this code is designed to sound no tone when descending normally at speeds near your min sink rate.
// it sounds (relatively) continuous low frequency tones when descending faster than user-settable sink threshold.
// it sounds high-frequency beeps when gaining altitude faster than user-settable ascend threshold.
// it may detect when you are getting thermal uplift but still descending. This can be disabled if preferred.

EDsteve

// Original code by Rolf R Bakke,  Oct 2012, 
// Modified May 2017 by Thomas Gilson. tbgilson@gmail.com
// code is for the arduino pro/pro mini, using MS5611 barometer and speaker on pin 2.
// can be hooked up to a button for different mode changes on the "fly" (he he).
// made especially for paragliders. 
// before using this, you should know roughly what your min sink rate will be.
// this code is designed to sound no tone when descending normally at speeds near your min sink rate.
// it sounds (relatively) continuous low frequency tones when descending faster than user-settable sink threshold.
// it sounds high-frequency beeps when gaining altitude faster than user-settable ascend threshold.
// it may detect when you are getting thermal uplift but still descending. This can be disabled if preferred.