HC-SR04 Ultrasonic Distance Sensor Arduino Nano when the token passes by

when the token passes by the reader

5A Sample Code

Pin Setup:

This board is used with Wi-Fi chips and Bluetooth Dual Mode

Low-noise analog signal path

HC-SR04 Ultrasonic Distance Sensor Arduino Nano when the token passes byThis is the HC SR04 ultrasonic distance sensor. This economical sensor provides 2cm to 400cm of non contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC SR04 module includes an ultrasonic transmitter, a receiver and a control circuit. There are only four pins that you need to worry about on the HC SR04: VCC (Power), Trig (Trigger), Echo (Receive), and GND (Ground). You will find this sensor very easy to set up