I've been playing with the LM3914 and i want to make some gauges for my car, the Power Voltage ranges on cars (my car) vary from 12.10V to 14.2V depending on running circumstances.
My questions are as follows:
1)I know i can drive a single color, but for nighttime, it would be nice to have all the LED's light up in one color to show fullscale, and use the comparators to drive the other color, thus using multiple color LED's. Do i need a dual polarity supply to do this, is there a simple solution to take care of the dual color thing?
2)Will the voltage changes at the +V source for the LM3914 change the range of the steps in Voltage needed to light each segment? in other words, will the Voltage changes from the alternator change the calibration of the guage? Should i consider a Voltage regulator on the Power inputs to steady the voltage to the IC?
Thanks, all feedback is welcome.
Josh
My questions are as follows:
1)I know i can drive a single color, but for nighttime, it would be nice to have all the LED's light up in one color to show fullscale, and use the comparators to drive the other color, thus using multiple color LED's. Do i need a dual polarity supply to do this, is there a simple solution to take care of the dual color thing?
2)Will the voltage changes at the +V source for the LM3914 change the range of the steps in Voltage needed to light each segment? in other words, will the Voltage changes from the alternator change the calibration of the guage? Should i consider a Voltage regulator on the Power inputs to steady the voltage to the IC?
Thanks, all feedback is welcome.
Josh