SpaceSalmon

Space Salmon is the second generation (by some counting) rocket flight computer developed by SSI. It was preceded by the Skybass flight computer. In 2019, it gained a fishy younger brother, ThunderGuppy.

SpaceSalmon built on the previous generation SkyBass flight computer. Unlike SkyBass, which was a rectangular PCB that mounted vertically I'm the vehicle, Space Salmon was built onto a circular disk-shaped PCB, which fit into the rocket horizontally. This disk stacking arrangement (known coloqially as "Stack Boi") was intended to compactify the avionics and reduce mechanical weight.

The avionics stack used two 12-pin headers for electrical connection between boards. The A-Stack carried power, arming, and data bus lines, while the B-Stack carried charge activation lines downward to the bulkhead.

The Code Lives on Github

The Schematics and Layout are Here

Hardware Features

Brains:

• SAME51J20A (TQFP 64) CPU
• ESP8266 WiFi module

Sensors:

• BMI088 6 Axis Accel/Gyro (up to 24G, 2000deg/s)
• BMP388 Pressure/Temperature
• ADXL375 3 Axis Accel (up to 200G)

Power:

• 2x 18650 Li-Ion cells
• 3.3v and 5.0v buck-boost converters, over 90% efficient

Misc:

• Micro SD card slot
• MC33797 automotive squib driver, for ematch control
• Dual 5V I2C bus, for communication between boards in stack