Trimix Analyser
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Housing and sensor tube for Trimix analyser
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Updated at source:
Model information
- Source
- Printables
- Category
- Outdoor Sports
- License
- Creative Commons — Attribution — Noncommercial
updated version:
https://www.printables.com/model/677331-trimix-analyser-v2
This is my housing and sensor tube to go with the electronics of the trimix analyser.
The housing is as compact as I could make it around the electronics and components.
The analyser functions surprisingly well. The differences to the Divesoft analyser that uses a different technology is within the measurement error of 1%, both for the oxygen as well as the helium content.
Biggest plus for me, is that this analyser is not sensitive to noise (as the Divesoft is) I can use it in the intake of my compressor (fed by a small pump) after my Trimix-Stick and double check what is going through the compressor, not having to rely only on the two oxygen sensors of the TMX stick
Part-List:
Housing:
- Front
- Back
- Button (to access the battery module, not strictly necessary)
- Sensor tube
Electronics:
(Links are examples)
- O2 Sensor (https://www.aliexpress.com/item/4001251139449.html?spm=a2g0s.8937460.0.0.10c32e0e4awVNS)
- “He” Sensor MD62(https://www.aliexpress.com/item/32725880118.html?spm=a2g0o.9042311.0.0.27424c4djdDbgC)
- Microcontroller Seeeduino (https://www.aliexpress.com/item/1005001728616918.html?spm=a2g0o.9042311.0.0.27424c4d7wiisY)
- 16bit ADC ADS1115 (https://www.aliexpress.com/item/32850495005.html?spm=a2g0o.9042311.0.0.27424c4dLEGYza)
- Display (https://www.aliexpress.com/item/32844104782.html?spm=a2g0o.9042311.0.0.27424c4dkFcJHs)
- LiPo charger board (https://www.aliexpress.com/item/1005002265364454.html?spm=a2g0o.9042311.0.0.27424c4dCHGMHp)
- Voltage regulator LM317
- Resistors
- Trim potentiometers 1kOhm
The circuit board was done in Fritzing
Idea & Arduino code is largely based on these two projects (adapted to my components and preferences):
https://github.com/captainigloo/Trimix-analyzer
https://www.godive-brandenburg.de/downloadse2467a8c