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

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Comments/Questions:

• Bad therm0c0up|e , bc - 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 bc e=special bc you have to read voltage magnitude across the two types of metal which can be easily influenced, i.e. resistor of wire plus breakaway connector will have breakaway thingie which will affect it. - be special, having resistances, even small ones will effect voltage magnitude. This is bad because the breakaway wires will have the same effect, which is ultimately hindering the readings. Mary Dertinger (RIT Student) 

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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.

Comments/Questions:

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Data Reporting:

PROMPT will be connected to the backplane through the standard RS485 interface provided on the sensor board. This interface also provides a 5-volt supply for PROMPT. In the event that an RS485 connection cannot be established, PROMPT will log its data locally.

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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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