To pull your output to zero, you can try adding a pull-down resistor between your input terminal and ground. While your input is connected, the voltage will go into the device if it has a lower resistance than the device input. If you do not have your input wires attached, the input will read in the value of ground through the resistor. A 10k ohm resistor is recommended. See related links for more information on pull-down resistors.
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