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I have the 12in Tape Sensor and an Arduino Uno. I'd like to get use this to measure volume in a cup. They gave me a resistor and a little connector for the 4 pins with the sensor, and I have some wire and a Multimeter.

I am really unsure of how to do even this very basic thing. I would like to extend this into a more useful hack, but right now I'm trying to get basic functionality. In this video, it looks like they're literally just connecting two ends to the multimeter and that works. I have 4 pins though.

Where do I begin?

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The easiest way to do it is to create the "Simple Voltage Divider" circuit found in the datasheet and connect that to an analog input. Apply power to pin 1, ground to pin 2, and connect pins 3 and 4 together to the input. You can then perform a normal ADC conversion and then from there determine the height of the liquid.

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ So I don't need to use the resistor to simply get something to print out values from a pin on my Arduino? Should I use Vin, 5V, or 3.3V for the power (first pin). Can I use, say, pin 13 for my input? \$\endgroup\$ – Mark Lyons Nov 7 '13 at 2:49
  • \$\begingroup\$ @MarkLyons: The strip already comes with a matched resistor (Rref) that you should use in order to compensate for the temperature of the liquid. V+ should be the same voltage as the power supplied to the Arduino, at least until you start getting into low-level MCU details. You need to connect it to one of the analog inputs ("An"). \$\endgroup\$ – Ignacio Vazquez-Abrams Nov 7 '13 at 2:59

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