![]() ![]() If you have a sensor with 3.3V required input voltage, you can also connect this without USB converter directly to the GPIOs. If the name differs (because, for example, other devices are connected), you have to adapt it accordingly in the following steps. #Digitalpersona 4500 software serialIf no other serial devices are connected via USB, nothing should be displayed first and afterwards /dev/ttyUSB0. To check whether the cabling is correct and whether the sensor is detected, you can open your console and perform the following before and after connecting: ls /dev/ttyUSB* If your sensor needs a higher voltage than 3.3V (and the maximum value is equal to or greater than 5V), you can connect the red cable to the 5V pin.
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