https://github.com/stianeikeland/nitrox-analyzer

Atmel AT90USB1287 based DIY Nitrox analyzer
https://github.com/stianeikeland/nitrox-analyzer

Last synced: about 2 months ago
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Atmel AT90USB1287 based DIY Nitrox analyzer

• Host: GitHub
• URL: https://github.com/stianeikeland/nitrox-analyzer
• Owner: stianeikeland
• Created: 2012-11-08T20:46:55.000Z (about 12 years ago)
• Default Branch: master
• Last Pushed: 2012-11-22T21:07:18.000Z (about 12 years ago)
• Last Synced: 2024-10-15T21:34:30.191Z (3 months ago)
• Language: C
• Size: 215 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Nitrox Analyzer

A completely overkill Atmel (AT90USB1287) based nitrox/oxygen analyzer.

Uses a Vandagraph R-17 oxygen micro fuel cell.

## Implemented features:

- Hold current value (push button)

- Easy air calibration (hold button for 1.5 sec)

- Push button to power on, auto power off after 5 minutes idle.

- Nokia 5110 LCD with big oxygen percentage readout + bar graph

## Planned features / Half baked ideas:

- Helium/Trimix analyzer using ultrasound

- Logging of analyzed values w/ date - RTC (+ export via USB).

- Logging of air calibration values (predict fuel cell failure)

- USB Bootloader (for easy firmware upgrades)

- Menu system and rotary encoder for navigation.

- Temperature compensation.

## Schematics:

[![Schematics][schematic-small]][schematic]

## Bill of materials:

- Atmel AT90USB1287

- Vandagraph R-17 Oxygen micro fuel cell

- LTC1779 step down DC/DC Converter

- PCD8544 / Nokia 5110 LCD

- AD8031 Op-amp

- Li-po (or similar power source)

- 8 MHz crystal

- Assortment of resistors, capacitors, push buttons, headers, etc.

## Authors:

- Stian Eikeland

- Bernt Hustad Hembre

## Legal:

The source is released under the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

[schematic]: http://s3.tadkom.net/nitrox/nitrox-schematic.png

[schematic-small]: http://s3.tadkom.net/nitrox/nitrox-schematic-small.png (Schematics)