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Reply to "Fuel Injection and Electronic Ignition for VW engines - Speeduino Style"

In other Speeduino news, I added a second MAP sensor to the Speeduino so it could do altitude compensation in real time, rather than just on startup. It's a very simple circuit, and I took the shortest route rather than trying to do a fancy circuit board and mount. 

I bought an identical MAP sensor and cut off the unused 3 pins (pins 4-6) and ground off the mounting tabs and the air inlet. I then soldered it right on top of the MAP sensor on the board connecting pin 3 (+5V) and pin 2 (ground). Pin 1 is the output. I connected pin 1 through a 470 ohm 1/4 watt resistor to the A7 analog input pad for the Arduino chip. I also connected a 330 nf capacitor between pin 1 and ground.

To enable real time barometric correction, you go to the Tools tab in Tunerstudio and choose Calibrate Pressure Sensors. You enable Baro and tell it which type of sensor you're using and which analog input pin it's connected to.

Most people won't need to do this. It's really only useful for folks who deal with a lot of altitude changes.2ndBaro

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Last edited by Michael Pickett
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