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

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The temperature sensing inside the parachute bay will be accomplished using a temperature sensor screwed directly into the bulkhead between the avionics and payload bays. For the booster, the temperature sensor will be on a set of breakaway wires through both bulkheads. The most likely approach that will be taken to implement this is to put a barrel jack on the bulkhead of the booster, which is then connected to with a barrel plug. This will provide the greatest chance of a proper pull-out, but may not provide a reliable connection and may introduce errant resistance, skewing measurements. 

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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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Component Selection:

0-60PSI pressure: ABP2LANT060PG2A3XX

• Used by Sparkfun
• i2C interface
• Not on JLCPCB

Comments/Questions:

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Thermocouple Amplifier: MAX31855 

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

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Comments/Questions:

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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:

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