Some USB-GPIO Interface Adapters have several analog inputs connected to an Analog to Digital Converter (ADC). Analog to digital conversion has many applications. You can acquire data from various analog sensors and save it to your PC for further processing. You can also implement a real time analog data processing in your software. Combined with other USB-GPIO adapter modules you can implement feedback control over your hardware. Analog to digital conversion is well utilized for external analog signal reading such as current, voltage, temperature, distance, pressure, or even color information.
Analog to Digital Converter inputs can generate events. If you adjust low or high threshold value, the adapter will send events once this threshold is crossed.
DLN-4M and DLN-4S each have 2 ADC modules. The first one has 4 10-bit channels and the second one has 4 12-bit channels. DLN-4M or DLN-4S USB-GPIO adapter can be used to measure voltage from 0 V to VDD (positive supply voltage). Since VDD can be configured as 3.3 V, the ADC can be used to measure voltage from 0 V to 3.3 V. You can use either VDD or external supply as the reference voltage.