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[http://shop.vems.hu/catalog/pressure-sensor-100psi-p-167.html 100psi Oil Pressure Sensor] '''pinout, Looking into the sensor:''' * top-center (green): 0.5-4.5V pressure signal output for 0-100 psi (slope appr: 4V / 7 bar, or 1V/25psi) * bottom-left (red) +5V supply (normally <30mA) * bottom-right (yellow) GND ---- Here you can find a fuel pressure sensor having a gauge and an alarm outlet pin: http://www.vems.hu/files/MembersPage/FerencGal/fuel_pressure_sensor_kicsi.jpg See the calibration test result below. http://www.vems.hu/files/MembersPage/FerencGal/calibration_of_pressure_sensor.jpg The alarm sensor part switches '''on below 0,8 bar.''' (useful to lit "oil-pressure-too-low" indicator lamp) ---- Another type fuelpressure_sensor: http://www.vems.hu/files/MembersPage/FerencGal/pressuresensor_kicsi.jpg Its calibration curve is linear: http://www.vems.hu/files/MembersPage/FerencGal/pressuresensor_calibrationcurve.jpg This is not absolute pressure, but relative to athmosperic. So 5bar measurement range means (1 bar athmosphere) + (for example): * 2 bar boost + 3 bar fuel pressure (above MAP) * or 1.2 bar boost + 3.8 bar fuel pressure (above MAP) //Is this a 5 bar operating range pressure sensor? I have 3.5bar base fuel pressure and 2.5 bar boost... //pnanassy// ---- '''Fuel pressure sensor connection''' * GND - resistive pressure sensor - 270 Ohm pullup - 5V (EC36pin28) * the signal from the sensor (not the GND but the other end, of course: that has the pullup) connected to an analog input: EC18pin6, 12 or 16 depending on your ECM configuration, see text for assembled controller in WebShop * 1.0.36 firmware can log the MCP3208 signals (as 0..5V) to MegaTune ** try to take note of the real pressure and real voltage (just for verification) to be compared to the readings in the log ** conversion table (voltage to real pressure) will be added later (don't forget to publish on your project page the type of sensor used!). ** propose a position on the 4x20 LCD for the fuel pressure (maybe instead of the iac RPM target on the bottom right part of mlp00 ? - That would be perfect. FERO)
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