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Wiring Diagram - Monitoring a DC Voltage Change with the HOBO UX120-017 and HOBO UX90-001
Attached is a drawing that shows how to monitor a DC voltage change with the HOBO UX120-017 and the HOBO UX90-001.
Note that the DC voltage must go below 0.4VDC to be detected as a low state. It will be necessary to add a pull down resistor across the input if measuring a direct voltage to insure the input returns to low state.