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STELLA-1.0 – Build Instructions

We originally designed the STELLA-1 instrument to work with the 2.4” TFT Touch Screen Display Featherwing, part number 3315,

That display is out of stock, due to ongoing supply chain issues. While the Featherwing version is unavailable, we’ve developed a workaround to duplicate the functionality, so we can continue to make STELLA-1 instruments. 

Tools Required

  • Wire cutter
  • Wire stripper -- 26-22 AWG
  • Needle nose pliers
  • Soldering iron, with a soldering iron stand
  • Lead-free solder, SAC305 alloy: Sn (tin) 97%, Ag (silver) 3%, Cu (copper) 0.5%
  • Desoldering braid
  • Safety glasses
  • Soldering fume exhauster
  • Full size breadboard, for use as an assembly fixture
  • Computer: A computer running either Apple Macintosh or Microsoft Windows operating systems
  • 3D printer, fused filament type, 20 cm cube printing volume
  • Printer filament: black, white, blue
  • Ruler
  • Thin film double stick tape, for mounting the power button
  • Solder sucker: suction desoldering tool

Note: The 3D thermal sensor spacer and 3D Feather spacer should be printed before assembly.

Build Steps - Part 1 Wiring

Build Steps - Part 2 Header Pins

Build Steps - Part 3 Install sensors

Build Steps - Part 4 Discrete Components

Build Steps - Part 5 Assemble Datalogger board

SUPPLY CHAIN NOTE: You may use either the Feather RP2040 or the Feather M4 Express for STELLA. Either one will run using the same software. These instructions show the Feather RP2040 because that unit is available. The Feather M4 Express is out of stock, and likely to remain so.

Build Steps - Part 6 Connectors (optional)

Build Steps - Part 7 Final Assembly

Build Steps - Part 7* Alternate Final Assembly

* Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.