Boost

Introduction

Every 0-5V Sensor is suitable!

Its measured with a MPX4250AP Sensor.

The MPX4250AP is good for naturaly aspirated engines and engines with a maximum of 150kPa (1,5Bar / 21Psi) boost pressure.

For more, the MPXA6400AP can handle up to 300kPa (3Bar / 43Psi) boost pressure. (DigiKey: MPXHZ6400AC6T1CT-ND

And when you want to go nuts, take the MPX5700AP for insane 600kPA (6Bar / 101Psi)

Details

The Conversion from the 12Bit ADW Signal into "Bar" is done like that: (For the MPX4250AP)

  CalRAWBoost = 5.0*AnaIn[BoostPin]/4096.0;             //only gets 0-5V
  CalRAWBoost = (CalRAWBoost * 50 - 10)/100;     	//makes 0-250kPa out of it
  CalBoost = CalRAWBoost - CalLD;			//apply the offset (ambient pressure)

all Numbers are float.

The Ambient Pressure is saved during setup into the EEPROM.

For the MPXA6400AP Sensor the Code needs to be changed to:

  CalRAWBoost = 5.0*AnaIn[BoostPin]/4096.0;             //only gets 0-5V
  CalRAWBoost = (CalRAWBoost * 80 - 10)/100;     	//makes 0-400kPa out of it
  CalBoost = CalRAWBoost - CalLD;			//apply the offset (ambient pressure)