Problem resolved. I disconnected the 6VDC power pack from the 1135 Precision voltage Sensor and ran the example program. It displayed a value of 2.4884. Thus, I replaced the 2.5 in the formula with 2.4884 and the problem is resolved.

I am using the 1135 Precision voltage sensor to monitor a 6 VDC battery pack using the 1018 Interface kit to connect to RPI 3 I am using the C language VoltageInput example. The example consistently displays a 2.8938 value. Using a DVM to measure the battery pack indicates the voltage is at 5.91 VDC...

Thanx for the info. Yep, it appears that I need some sort of ADC converter to use the 1135_0 voltage sensor with a RPI. Thus, I've ordered the 1018 Interface board.

I only need one Phidgets device to monitor the voltage level from a battery. The voltage level ranges from 9.0 to 14.5 volts. I don't want to invest $80.00 in the 1018 interface kit but would rather directly connect this one sensor to a RPI3. Can this direct connection be done? If so, how would I do...