This is a scale functional replica of the Digital Indicator panel for the Apollo Guidance Computer. It is designed to be part of a larger replica of the Display and Keyboard (DSKY) module of the AGC.
This project is composed of these component subfolders:
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artwork - artwork to be printed or silk-screened onto the glass/acrylic cover.
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pcb - KiCad project for the controller PCB design
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firmware - Arduino-based controller firmware. This module is designed to be controlled via the USB serial interface.
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hardware - 3D-printable frame components designed using Fusion 360. STEP and Fusion source files available. Hardware models used in thie replica were derived from models found in the AGC Mechanical CAD project.
- USB 2.0 Micro-B port
- J-LINK-compatible SWD debugging interface (10-pin header)
- Power: +3.3VDC via a 4-pin header (2.1A maximum (estimated; software limited to 0.5A))
Summary below. You will find more detailed notes in the ./pcb folder.
As of late August 2021, V4 of the board passes functional testing except for a few PCB assembly issues. I expect all that remains to be done is some basic rework. I ordered my PCBs from pcbgogo.com. I also ordered 0.1mm solder stencils at the same time. I ordered parts from Digi-Key; you will find Digi-Key part numbers as part of the KiCad component list in the schematic. As of August the LP5036 LED drivers are in short supply.
I use a solder reflow oven in my shop. With the V4 board I use a two step process to first reflow the back (LED) side using Sn63/Pb37 paste, then reflow the front side using a lower temperature solder paste (Bi57Sn42Ag1).
The original NASA drawings for all variants of this component, 1006387D for example, point to this NASA paint specification [1008809-1]. It states FED-STD 36231 as the external color of the unit. Good quality historial photos (examples here and here) seem to imply a slightly different shade of gray, though.
I may custom mix using Nazdar pigments, or I might simply use an aircraft-grade epoxy premix of FS36231. For now, I am simply using Krylon brand Ultra Matte Finish - 4102 Misty Gray paint.
This project is inspired by work by Ben Krasnow creating a DSKY Electroluminescent Panel replica. You'll find information about that project in this Applied Science video by Ben. Like Ben's E/L display, this project is driven by an AT SAMD21 microcontroller chip; the same chip is used in the multiple Adafruit microcontroller boards, including the Adafruit Trinket M0.
Creative Commons Attribution/Share-Alike, all text above must be included in any redistribution. See license.txt for additional details.
My name is Riley Rainey. I'm a software developer by profession. I spent a number of years building aerospace simulations as my day job.
There's no official support available, but you can leave comments or create an issue in this GitHub project.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
