Xonix NX-Vario, User Manual

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12
From the author
I started flying the paraglider pretty long time ago, somewhere in the beginning of 2008.
And quite quickly I understood that I need a variometer. But at that time it was unrealizable,
as prices were heavily biting (however, since that moment the situation with prices has not
changed at all). Several years passed, I graduated the University, changed couple of jobs and
again lit up with this device, however, this time I planned to create it myself on the basis of the
bare ATmega controller. There were already projects for assembling from other guys, but I
wanted to make the device myself. However, I had a bad try, because I did not have enough
knowledge and skills in microcontroller programming. And now, a few years later, I first
touched the platform Arduino and realized that this is my chance. In January 2017, I started
the development, and in mid-March of the same year, the beta version of the device was
ready and already tested in the air a couple of times. I tried to put in this device a maximum of
useful functions that may be needed in different flight modes and situations.
If you, dear sky fellow, want to repeat this device, then here's a list of necessary elements:
1. Arduino Nano (necessarily on a 328 chip, 168 is not suitable - not enough memory);
2. LCD screen 16x2 (that would not change either the connection diagram, or the firmware
code, the screen should be with a soldered I2C adapter;
3. BMP180 sensor (I wrapped my with soft foam that it would calmly bear sharp noisy
pressure surges);
4. Piezo buzzer (I got my from the old PC, it’s pretty loud);
5. Red and green super-bright LEDs;
6. Couple of 220 Ohm resistors for LEDs;
7. Three buttons without fixation;
8. Three 10K resistors for buttons;
9. One button with fixation (or any switch);
10. About a meter of a thin wire for connecting the elements together;
11. The case (here for your fantasy full expanse, I used an electric box from the hardware
store, it fit perfectly in size);
12. A 9V Brick Battery and a connector for it (you can make one from the old 9V Brick
Battery);