Arduino variometer

Mini Paragliding variometer based on Arduino technology.

Aim of this project is to have the smallest and cheapest paragliding variometer. Mechanical fixation will be realized using action cam standard allowing tones of fixing possibilityes.

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Component and prices

• Arduino Nano Atmega328 [4.33€]
• Piezo Buzzer passive [2.49€]
• BMP280 sensor [2.66€]
• Batterie Shield [2.99€]
• Battery [12.23€]
• Switch On/Off [0.28€]
• I2c DC - DC adapter [0.80€]

Total Price 25.78€

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Software environnment

• arduino-1.8.13 IDE
• Visual code 1.53
  • vsciot-vscode.vscode-arduino
  • ms-vscode.cpptools
• blender 2.80
• fritzing.0.8.7b.pc
• fritzing library https://github.com/adafruit/Fritzing-Library

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Schematics

Representative prototype

Schematic

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Mechanic

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Callibration mode

Software allows debug and callibration modes

Serial mode

Using USB serial console to print information. Buzzers are disabled quiet mode.

Uncomment #define DEBUG 1 to activate.

Sound setup

In order to test and found best suitable sound you can use these mode and serial debug link to test buzzer sound.

Uncomment #define SOUND_TEST 1 to activate.

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docs

BMP280 https://cdn-shop.adafruit.com/datasheets/BST-BMP280-DS001-11.pdf

MPU6056 https://invensense.tdk.com/wp-content/uploads/2015/02/MPU-6000-Datasheet1.pdf

Nano pinout https://content.arduino.cc/assets/Pinout-NANO_latest.pdf