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Digital interface : 5V TTL level UART interface
74HC195 is a high speed 4-bit SHIFTREGISTER utilizes advanced silicon-gate CMOS technolo-gy to achieve the low power consumption and high noiseimmunity of standard CMOS integrated circuits
It will return a higher value around 5
Distance measurement
NFC RFID 13.5 Mhz (Read -Write) Servo Extension Digital interface : 5V TTLIntroduction : NFC, in short for Near Field Communications is a technology standard based on Radio Frequency Identification (RFID), transmitting information wirelessly over short distances. This module is built around NXP PN532. The module is equipped with onboard antenna, thus no external antenna coil is needed. It is compatible with SPI, IIC and UART interface for communication. With NFC library support for Arduino. This feature is available in the