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


The PROMPT is a remote sensor daughterboard that will be placed at the base of the parachute bay, to record metrics regarding the operation of the parachutes. The data from this module will be sent back to the main sensor board over RS485. This includes:

  • The pressure of the parachute bay 
  • The temperature inside the parachute bay
  • The temperature in the booster
  • Whether or not the payload has been deployed


Temperature Sensing

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, far beyond the range of most NTCs. So, a choice is left between RTDs and Thermocouples. While RTDs would be more accurate, they are more expensive and available in fewer packages than a thermocouple would be. 


Component Selection:

0-60PSI pressure: ABP2LANT060PG2A3XX

  • Used by Sparkfun
  • i2C interface
  • Not on JLCPCB

Thermocouple Amplifier: MAX31855 

  • Used by Adafruit
  • i2C interface
  • JLCPCB: C52028

RS485 Transceiver: MAX487

  • Slew-rate limited
  • UART interface
  • JLCPCB: C9953

Microcontroller: 

  • Unknown, probably STM32

Memory: W25Q128JVSIQ

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



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