Nitrox Mixer

This is very much a work in progress. I would barely call this a prototype. I'm not responsible for anyone or anything that happens form the use of this code or components.

If you would like to submit changes please reach out to me at jeremy.k.bryson@gmail.com. I hope this code gets better over time. I also have plans to make it into a Trimix mixer down the road.

Important

• The proportional control valve is a 0-10vdc valve. Do not exceed 10vdc

Proportional Control Valve

• Vendor: Kelly Pneumatics - https://kellypneumatics.com/product/miniature-proportional-valve/
  • Mini Proportional Valve
    • Inlet Pressure: 100 psi
    • Back Pressure : N/A
    • Flow Rate: Max
    • Medium: Air
    • Orifice: .040"
    • Control Signal: 0-10 vdc (1.8 watts)
    • Ports: Inline 10-32
    • Seals: Viton

Parts with Amazon links

• Arduino Nano (ATmega328p) - https://www.amazon.com/gp/product/B07D12TWNZ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• Analog to Digital converter(ADS1115) - https://www.amazon.com/gp/product/B08HLYKXC6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
• OLED Screen(I2C 128x64 White) - https://www.amazon.com/gp/product/B07VDXYDVY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
• PWM Module (5-36v) - https://www.amazon.com/gp/product/B07NWD8W26/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• Rotary Encoder (KY-040) - https://www.amazon.com/gp/product/B07F26CT6B/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
• Power Switch (Rocker style) - https://www.amazon.com/gp/product/B08B8BHVJ9/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• DC POwer jack (5.5 x 2.1mm) - https://www.amazon.com/gp/product/B07XCNSM81/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• 3.5mm jack (Thiese suck. I'm looking for better ones) - https://www.amazon.com/gp/product/B08XM6DR96/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• USB extension (Mini USB) - https://www.amazon.com/gp/product/B08NPJDTVC/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• Push-to-connect Fittings (10-32) - https://www.amazon.com/gp/product/B0B92C9VPJ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
• tubing (pneumatic 1/4 inch) - https://www.amazon.com/gp/product/B07R2F97T9/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&th=1

Wiring Diagram

• Coming ASAP