PROMPT - Project for Recording, Observing, and Measuring Parachute Tube

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• Bad therm0c0up|e - therm0cuples read magnitude 0f v0ltages between 2 different metals which is proportional to the temp. Since it is reading voltage magnitude the wire has to be special, having resistances, even small ones will effect affect voltage magnitude. This is bad because the breakaway wires will have the same effect, which is ultimately hindering the readings. Mary Dertinger (RIT Student) 
  • Correct. Trying to measure millivolts when your wires/connectors add multiple ohms of resistance will skew your readings. Since RTDs are resistance-based devices , you can simply measured in the tens of kiloohms, the added resistance of a wire and connector is not that bad.

Pressure Sensing:

The pressure inside a standard parachute bay should be between 8 and 15 PSI when the parachutes deploy. In case that value is incorrect, a significantly overrated sensor was chosen. The selected sensor also has considerations for the attachment of a measuring tube, to allow the sensor to be situated away from the bulkhead, therefore reducing wiring complexity. This measurement tube will be run through the bulkhead and to PROMPT wherever it is mounted.

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• Breakout is not in stock
• Chip is in relatively low stock
  • Correct, but not that big of a deal. Pressure sensors intended to be both board-mounted and also connected to a tube are relatively uncommon and not often used. That, paired with the fact that they are physically large, means suppliers rarely stock many of them. The same thing can be seen on a lot of oddball large devices like shaft encoders.
• Expensive chip
• why the weird tube thing jk  
• Sensor should be placed close to the bay, shortest tube possible

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Component Selection:

0-60PSI pressure: ABP2LANT060PG2A3XX

• Used by Sparkfun
• i2C interface
• Not on JLCPCB

Comments/Questions:

• a 

Thermocouple Amplifier: MAX31855 

• Used by Adafruit
• 3-Wire SPI interface
• Cannot be used with grounded thermocouples
• JLCPCB: C52028

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Comments/Questions:

• a 

Memory: W25Q128JVSIQ

• Same as most other devices on the backplane
• JLCPCB: C97521

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• Widely used by Adafruit and similar
• Input range from 0.5 to 5.5v
• Output adjustable from 2.2 to 5.5v
• 3.7A max current
• Pass-through mode when VIN > VOUT
• JLCPCB: C919459

Comments/Questions:

• a