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Old 09-22-2008, 09:24 PM   #1 (permalink)
dcb
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Reading a MAP sensor

Here's my notes on experimenting with a map sensor on the bench with a brake bleeder pump and a duino. using a 5 volt reference.

inches of mercury, pin value
ambient, 762
3, 667
5, 619
8, 543
10, 493
14, 390


~25.18 units per inch

Map pinout (your sensor may be different)
Code:
connector  _________
front     (_________)
              ||
            A  B  C
           +5  -  Signal (on analog 1)
looks pretty linear till you get near ambient. The cheap gauge on the pump probably has a lot to do with that.

Code:
int mapPin=1;
void setup(){
  Serial.begin(9600);
}
void loop(){
  Serial.println(analogRead(mapPin));
  delay(500);
}

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Last edited by dcb; 09-22-2008 at 09:38 PM..
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