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Undo revision 4392 by Timv (talk)
ThunderGuppy is the third generation of SSI rocket flight computer. It's hardware was developed in 2020 by Tim Vrakas. ThunderGuppy followed the SkyBass and [[SpaceSalmon]], making the naming scheme O-Fish-ial. ThunderGuppy was the smallest generation of the family to date, and was designed to fit as a standalone module into a standard 2" airframe, much like the Stratrologger and Raven COTS Altimeters.
[[File:Guppy Front.jpg|thumb|500px|Front of Thunderguppy v3.1]]
[[File:Guppy Image Back.jpg|thumb|500px|Back of Thunderguppy v3.1]]
=== Hardware Features ===
From the start, ThunderGuppy was designed to be mostly compatible with the earlier SpaceSalmon. Aside from the major change to form factor, Guppy introduced the following changes:
*Integrated [[S6C]] Radio and GPS hardware, in place of an add-on RF carrier module needed for SpaceSalmon.
*Two FET-based squib drivers, in place of the MC33797 4-channel squib driver IC. These are not designed to safely control high-risk initiators, but decrease complexity.
*A single 18650 Li-Ion cell. This was needed to satisfy the form factor requirement.
*Dual accelerometer banks, each with high and low range 3-axis sensors. This allows emulation of a high-range gyroscope by indirect measurement of centripetal acceleration.
==== Brains: ====
*SAME51J20A (TQFP 64) CPU
==== Sensors: ====
*2x BMI088 6 Axis Accel/Gyro (up to 24G, 2000deg/s)
*2x BMP388 Pressure/Temperature
*2x ADXL375 3 Axis Accel (up to 200G)
==== Power: ====
*18650 Li-Ion cell
*3.3v buck-boost converter, over 90% efficient
==== Misc: ====
*Micro SD card slot
*PFET squib driver, for E-Match pyrotechnic charges
*CAN Transceiver (not implemented)
*RS-485 Transceiver (not implemented)
The schematics and board designs are [https://github.com/stanford-ssi/ThunderGuppy-EE/ avialable here]
=== Software ===
ThunderGuppy Inherits its codebase from [[SpaceSalmon]], with several modifications to support Guppy specific hardware features. The code lives here: [https://github.com/stanford-ssi/SpaceSalmon SpaceSalmon] The code can be built by selecting the `guppy` target in PlatformIO. An overview of the codebase was presented within SSI, using the [https://docs.google.com/presentation/d/10tnuvgWhj59NeUBxJNxlRW7EjcLI8pYms1Hf9A7qRLU/edit?usp=sharing slides here]