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markweatherill · 12-30-2013, 10:39 AM

Hi,

I have an O2 sensor gauge with a display that's a circle of LEDs, effectively a 1V voltmeter. I'm using it to read the output of my MAP sensor by having a potentiometer in circuit to act as a voltage divider and reduce the signal that the gauge sees, ie max 1V.
So it's a cheap boost gauge. The MAP sensor has a range of something like 1V - 5V where 1V (or so) is maximum vacuum, 2.65V is atmospheric pressure and 3.5V (or so) is full boost (0.5BAR). 5V would be 1BAR.
Now, maximum reading is something I can adjust on the potentiometer so that the gauge reads maximum at 3.5V.
What I'd like to do is make the gauge, instead of reading 0V - 3.5V, read 1V - 3.5V so I make use of the full range of the gauge.

Is there a simple way to do this? Thanks!

12-30-2013, 10:39 AM	#1 (permalink)
markweatherill Master EcoModder Join Date: May 2008 Location: UK Posts: 332 Thanks: 16 Thanked 79 Times in 54 Posts	Electronics question Hi, I have an O2 sensor gauge with a display that's a circle of LEDs, effectively a 1V voltmeter. I'm using it to read the output of my MAP sensor by having a potentiometer in circuit to act as a voltage divider and reduce the signal that the gauge sees, ie max 1V. So it's a cheap boost gauge. The MAP sensor has a range of something like 1V - 5V where 1V (or so) is maximum vacuum, 2.65V is atmospheric pressure and 3.5V (or so) is full boost (0.5BAR). 5V would be 1BAR. Now, maximum reading is something I can adjust on the potentiometer so that the gauge reads maximum at 3.5V. What I'd like to do is make the gauge, instead of reading 0V - 3.5V, read 1V - 3.5V so I make use of the full range of the gauge. Is there a simple way to do this? Thanks!