The USB adapter is labeled, but the fingerprint sensor cables are not. The voltage is very important for the connection.Ĭonnection of the Raspberry Pi Fingerprint Sensor other models have a voltage between 3.8V and 6V. Mine needs 3.3V input voltage, however, e.g. Note in the article description, what voltage your sensor needs. Apart from the voltage the models do not differ much.

Raspberry Pi Fingerprint Sensor ( US / UK).These are particularly suitable (also in connection with an Arduino). Some models can be used with both 3.3V and 5V voltage.

Since there are different fingerprint sensors, which do not all work with 3.3V, a USB UART converter is recommended. The Raspberry Pi has two pins (pin 8 / GPIO14 and pin 10 / GPIO 15), but they work with 3.3V.

These sensors were originally developed for the Arduino and can be read via UART. Accessories A USB TTL adapter with 3.3V and 5V voltage output can be used for many serial modules.