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DIY Touch Screen Trimix Analyser

Discussion in 'Making your own Gear' started by stevetto, Feb 10, 2021.

  1. stevetto

    stevetto Registered

    I have been working on a touch screen trimix analyser.
    I made a custom pcb.
    Pao, lucca brassi, OTF and 1 other person like this.
  2. stevetto

    stevetto Registered

  3. stevetto

    stevetto Registered

  4. Jarek Andrzejewski

    Jarek Andrzejewski Registered

    # of Dives: 100 - 199
    Location: Poland
    How are you going to measure helium content in mix? Ultrasound?
  5. stevetto

    stevetto Registered

    The usual MD61 sensor.
    MD61 Thermal Conductor Gas Sensor--Winsen

    I have made tests with HC-sr4 and similar ultrasonic sensors based on the measurement of the TOF and also tried to use white noise and than use FFT. Unfortunately I could not get reliable results.
    So finally I decided to use a thermal conductivity sensor.
    Johnoly and Jarek Andrzejewski like this.
  6. stevetto

    stevetto Registered

  7. stepfen

    stepfen Contributor

    # of Dives: 200 - 499
    Location: Greece
    Very nice - it looks so much neater with the custom PCB compared to wires.

    I have 2 questions:
    1. Any ideas about how to neatly direct the gas to the sensors? Do you use some kind of pipes or ??
    2. How do you provide the 3V required by the helium sensor on top of the 3.3 or 5V required by the Lolin board?

  8. Miyaru

    Miyaru Tec Instructor ScubaBoard Sponsor

    # of Dives: 2,500 - 4,999
    Location: below sea level
    Nice! I didn't look into ESP yet - the use of a touchscreen requires a lot of memory, which is a real issue using an Arduino.
    Curious to see some screenshots. I have one of those touch screen display's but I think they're quite dim, colors are not bright and it's difficult to read the screen outside in sunlight.
    2: you can see the buck converter on the main PCB - it's the component that outputs 3.0 volts.
  9. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    if you're going through the effort, PLEASE put a CO sensor on there....
    Akimbo, RyanT, OTF and 2 others like this.
  10. stevetto

    stevetto Registered

    There is an aluminium chamber which directs the gas to the sensors. 20210210_160259.jpg
    jale, rboban, OTF and 1 other person like this.

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