paragliding vario with arduino nano, piezo sounder, bmp180 altimeter, 4x Nimh batteries
old video:
https://youtu.be/r1CVEgGCK1Q
I made one using the MS5611 module, which is more expensive, but I read that it is less affected by RF noise.
new video:
https://youtu.be/hXAc20TRS4Y
I made one with BMP180 with ideas from here
https://www.youtube.com/watch?v=dkzky-Mxypo
putting it in a metal tin seems to cut out the RF interference.
I made one with BMP280.
This works so well that I can leave the sensor to do the averaging and let the arduino sleep in between.
The reponse time is quicker than the one with the BMP180.
Instructions here https://github.com/danheeks/vario/tree/master/bmp280piezo
One battery lasted me two summers of amateur paragliding, maybe 50hrs, including a flight of 202km in the UK!
https://youtu.be/KGif6ZkmjKs?t=256
