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Stratux with Oled display for57mm instrument hole

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TomBric edited this page Dec 24, 2022 · 1 revision

Everything you need for a full stratux installation in your airplane.

ALL-IN-ONE
Pictures

List of materials

  • Everything you need for a stratux with OGN transmit capabilities, see here on the main stratux page
    • Stratux 3B+, welectron or other suppliers
    • T-Beam, amazon or other suppliers. Use the version with Neo 8M GPS
    • NoElec SDRs, amazon or other suppliers
    • GY 91 sensor (BMP280, MPU 9250), amazon
    • Short USB cable, many types, e.g. amazon
  • Step-Down power converter to connect to 12 or 24 v: LM2596 (lots of suppliers), ebay
  • 1.5 inch RGB OLED display, waveshare, e.g. supplied by welectron
  • SD card extender to be able to access the SD from the front, e.g. supplied by reichelt
  • Aluminum sheets 0.5 mm thick for the case and a small part Aluminum sheet 1.0 mm for the back of the case. The case has dimension 64 x 64 x 150 mm (There is no need for aircraft grade aluminum, simple AlMg3 works good and is easier to bend)
  • 3D printed front. I suggest ASA material, e.g. 3Djake
  • 3 x micro switches 6x6 mm, length 10mm or 12mm (lots of suppliers, reichelt or ebay)
  • silent cooler fan Noctua NF-A4x10 5V, e.g. available here amazon
  • distance holder (brass) and screws 2.5mm, lots of suppliers, e.g. amazon
  • I use simple BEC connectors to connect to the aircraft power, e.g. here ebay
  • M3 screws to build the aluminum case and M4 screws to fit the instrument into the airplane
  • depending on your installation, you additionally need external antennas as well as an external gps receiver, e.g. reichelt
  • small black M2 screws for the 3d printed front, e.g. amazon

3D print files

  • OpenScad (if you want to modify something) source
  • STL-File (for direct printing) source

Hints for building

  • First 3D print the front, consisting of 2 parts. Install the display from the back in the inner part with small screws 2x4 mm

  • Install and solder cable to the 3 micro-switches in the front.

  • Install the sd card extender in the front and fix it from the back with hot-glue

  • Cut the aluminum case consisting of

    • part 1 "main": cut 3x64mm x 150mm from aluminum 0.5 mm. Bend 2 times at 64mm.
    • part 2 "top cover": (65+7+7)mm x 150. Bend so that the inner dimension is 65 mm.
    • part 3 "backside": (64x64)mm + sides a 7mm x 64 mm. Use aluminum 1 mm thick. 1mm aluminum is preferred here to be able to top the thread into the aluminum.

  • put the case together and drill holes at the front and the backside. Tap 3 mm threading into the front and the back. Tap 4 mm threading in the front for the fixing screws of the instrument panel.

  • Install the T-beam on the left side of the case with 5 mm brass holders. Connect the antenna and gps via an ipx-sma cable.

  • Install the LM2596 step down converter also on the left with 5 mm brass holders.

  • Install the fan on the right side using the noise dampeners. Cut opening holes to get enough air out on the right side.

  • Install the raspberry 3B via at least 20 mm long brass holders on the right, just on top of the fan.

  • Install all 4 SMA connectors at the back. Cut holes in the back to get air flow into the case.

  • Adjust the LM2596 step down converter to an output voltage of 5 V. Do this by connecting the input to some voltage between 8 and 40 V. I use an old laptop power supply with 19 V.

  • Connect all cables. Some hints for the connections:

    • Power connections to raspberry PI 3B: You can solder power cables to the Pi 3B by

      Cable Connection Point on Pi 3
      VCC + 5V PP2 point (near the USB mini power connector)
      GND Solder to large fixing point of network or USB connectors

    • Power connections to a Pi Zero (if you use one) : Since the zero has no voltage protection, you can directly solder the power cables into the GPIO holes:

      Cable Connection Point on Pi Zero or Zero2
      VCC + 5V PIN #2 or Pin #4 at GPIO
      GND PIN #6 at GPIO

    • Connecting the GY-91 Gyro Sensor and Barometric Sensor: Solder the cables on to the GY-91. On the Pi you either have to solder cables to the GPIO pin or the better choice is to connect via crimping of "Dupont" connectors to the GPIO pins

      Connection on GY-91 Connection Point on Pi 3
      VCC +3.3 V PIN #1 at GPIO
      GND PIN #9 at GPIO
      SDA PIN #3 at GPIO
      SLC PIN #5 at GPIO

Here are some pictures from the building process.

Building process
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