Little update
My MAP sensor (MPX4250AP) arrived so have added that to the test setup.
Pinout for the sensor (mainly as a reminder for me as I forget these things)
For reference, current lcd pinout and connection to Arduino is
1 (ground) - Gnd
2 (power) - +5V
3 (contrast) - Pin 9
4 (LCD RS) - Pin 12
5 (LCD R/W) - Gnd
6 (LCD Enable)- Pin 11
11 (Data 4) - Pin 8
12 (Data 5)- Pin 7
13 (Data 6)- Pin 6
14 (Data 7)- Pin 5
Have been playing with the lcd layout code a bit. Much neater now and displays inHg when the manifold is under vacuum.
Currently trying to code the bargraph to reverse when under vacuum. Once that is done I can mount it properly and fit it to the car
Also a problem with the local atmospheric pressure. As we all know it can fluctuate depending on conditions at the time so the values can be out by a small amount. I'm hoping to tap into the barometric sensor to get a local reference value.
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