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TopicNotes
Sleep on additional tradeoffs not enumerated here: 2022-7-13 Backplane Meeting

Don't need to find specific switch ICs right now, but keep in mind

Think about connectors

Backplane Connector Decision

  • Breakout I/O from each module through backplane instead of having individual breakouts on each module
    • Each backplane port has a unique pair of GPIO pins sent to e.g. a DE-25
    • All GPIO in one place for ease of integration
    • Less of a rats nest of wires in the av bay


Modules: Sensor/Battery, Power, Radio/Data Capture, Video, Deployment, Reaction Wheel Control, 

FunctionImplementationWhat module?GPIO Pin Count
AccelerationAccelerometer(s)Sensors0
AltitudeProcessing intertial, pressure, temperature, GPS dataSensors0
TemperatureThermistor, i2c deviceSensors0

Compass

MagnetometerSensors0
PressureBarometerSensors0
Remote TemperatureThermocouple, lmt86-like chipSensors2x3 = 6
GPSGPS IC, L-band antenna, 70cm antenna + transmitterGPS1
Pitch/Roll/Yaw/SpinGyroscopeSensors0
Radio TelemetryLoRa transceiverRadio/Data Capture0
Video TransmissionVideo transmitterVideo Transmission0
Video CaptureCameraVideo Transmission0 + Dedicated Connector
Electric Motor controlmotor controller BLDCArbitrary new control module8
Power IO: Multiple Deployment control +SmokeSwitching circuit, GPIO Deployment12
Sound, high frequency vibrationMicrophone, amplifier, ADCSensors0
Power DistributionSwitching power supplies, LDOsPower Distribution0
UmbilicalHardware connectors
2
Recovery BuzzerPiezo buzzer
2
Recovery LightConnector for externally-mounted Big LED
2
RTCRTC ICSensors0
Data StorageFlash chipsRadio/Data Capture0
Arbitrary control signalGPIOArbitrary new control module2x5 = 10
Servo ControlGPIO, External PowerArbitrary new control module3
Smoke GrenadeExternal smoke generator & GPIOArbitrary new control module2x2 = 4
Power Consumption MonitoringShunt and ADC (self-contained?)
0
External Status LightGPIO for external LEDRadio/Data Capture?2x4 = 8
Overcurrent/UVLOE-Fuse IC, Polyfuse, etc, Load switch IC, Fets, etc. 
0
Power Sequencing






Connector Limits:

12 pins at 3A

24 pins at 1A

+6 power wires (VBat, 5v, 3.3v, GND, GND, GND)

+ 4 Ethernet 


Goals by start of AY 2022-23

  • Connector(s) selected
  • Protocol selected
  • Voltages selected
  • Good idea for sensors
  • Good idea for module breakdown
  • Microcontroller selected
  • Requirements enumerated

Action items

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