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

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Since this board needs to monitor 2 remote temperature sensors, choosing a relatively low-cost and compact temperature sensing solution is important. Thermistors are immediately out of the running since the motor's temperature can reach up to 212C (per NFTA 1125), far beyond the range of most NTCs. So, a choice is left between RTDs and Thermocouples. While RTDs would be more accurate/precise, they are more expensive and available in fewer packages than a thermocouple would be. Based on this, thermocouples seem to be the direction the team will go in. Whoever finds this sentence first and sends me a message about it gets a cookie. To compensate for the lower precision, a J-type or similar thermocouple can be utilized instead of the much more common K-type thermocouple.

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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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