Zhang happy Windows 10 IoT Development Notes: HC-SR04 Ultrasonic Ranging module, iothc-sr04

Zhang happy Windows 10 IoT Development Notes: HC-SR04 Ultrasonic Ranging module, iothc-sr04

HC-SR04 with IO-triggered ranging. The following describes how to use Windows 10 IoT Core.

The project runs on Raspberry Pi 2/3 and uses C # for encoding.

 

　　1. Prepare

HC-SR04 X 1

Raspberry Pi 2/3 × 1

Dubang line with a public head × 4

 

　　2. wired

Vcc-5 V

Gnd-GND

Trig-GPIO 17-Pin 11

Echo-GPIO 27-Pin 13

　　

　　3. Code

GitHub: https://github.com/ZhangGaoxing/windows-iot-demo/tree/master/HC_SR04Demo

Add a C # code file HCSR04.cs to the project, copy and paste the following code, and do not forget to add references.Windows IoT Extensions for the UWP

using System.Diagnostics;using System.Threading.Tasks;using Windows.Devices.Gpio;namespace HC_SR04Demo{    class HCSR04    {        private int sensorTrig;        private int sensorEcho;        private GpioPin pinTrig;        private GpioPin pinEcho;        Stopwatch time = new Stopwatch();        /// <summary>        /// Constructor        /// </summary>        /// <param name="trig">Trig Pin</param>        /// <param name="echo">Echo Pin</param>        public HCSR04(int trig, int echo)        {            sensorTrig = trig;            sensorEcho = echo;        }        /// <summary>        /// Initialize the sensor        /// </summary>        public void Initialize()        {            var gpio = GpioController.GetDefault();            pinTrig = gpio.OpenPin(sensorTrig);            pinEcho = gpio.OpenPin(sensorEcho);            pinTrig.SetDriveMode(GpioPinDriveMode.Output);            pinEcho.SetDriveMode(GpioPinDriveMode.Input);            pinTrig.Write(GpioPinValue.Low);        }        /// <summary>        /// Read data from the sensor        /// </summary>        /// <returns>A double type distance data</returns>        public async Task<double> ReadAsync()        {            double result;            pinTrig.Write(GpioPinValue.High);            await Task.Delay(10);            pinTrig.Write(GpioPinValue.Low);            while (pinEcho.Read() == GpioPinValue.Low)            {            }            time.Restart();            while (pinEcho.Read() == GpioPinValue.High)            {            }            time.Stop();            result = (time.Elapsed.TotalSeconds * 34000) / 2;            return result;        }        /// <summary>        /// Cleanup        /// </summary>        public void Dispose()        {            pinTrig.Dispose();            pinEcho.Dispose();        }    }}

 

　　4. How to Use

The first step is to call the constructor to instantiate HCSR04. input the connection values of Trig and Echo.

Step 2 call Initialize () to Initialize the device

Step 3: Call ReadAsync () to read data and return a value of the double type.

Call Dispose () when you need to disable the device ()

 

For details, see GitHub.