RC522 RFID Card Reader/Detector Module Kit, 13.56Mhz
Description
Features: 13.56Mhz, S50, Mifare One
RC522 IC Brief Introduction
MF RC522 is used in highly integrated 13.56MHz contactless communication card chip to read and write, of NXP for “three” and the application launched a low voltage, low cost, small size, non-contact card chip to read and write, intelligent instruments and portable handheld devices developed better.
Analog Hall Sensor
An Linear hall sensor consists of Hall element, linear amplifier, and emitter follower and it outputs analog values.If you add a comparator to Linear hall sensor it will be able to output both analog and digital signals.we call it as analog hall sensor .
Principles
when the sensor approaches the magnet, the value of pin A0 will change. When the value exceeds the threshold set by the potentiometer before, D0 outputs low level and the corresponding LED lights up.
Hall Switch module
overview
Based on the Hall Effect, a hall sensor is a one that varies its output voltage in response to a magnetic field. Hall sensors are used for proximity switching, positioning, speed detection, and current sensing applications.
Hall Effect