com.diozero.devices.GP2Y0A21YK Maven / Gradle / Ivy
package com.diozero.devices;
/*
* #%L
* Organisation: mattjlewis
* Project: Device I/O Zero - Core
* Filename: GP2Y0A21YK.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2017 mattjlewis
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import com.diozero.api.AnalogInputDevice;
import com.diozero.api.DistanceSensorInterface;
import com.diozero.internal.provider.AnalogInputDeviceFactoryInterface;
import com.diozero.util.DeviceFactoryHelper;
import com.diozero.util.RuntimeIOException;
import com.diozero.util.SleepUtil;
/**
* Sharp GP2Y0A21YK distance sensor. Datasheet,
* Guide.
* Important to supply 5V to get correct readings (max output voltage ~3.2V).
*
* Range: 10 to 80 cm
* Typical response time: 39 ms
* Typical start up delay: 44 ms
* Average Current Consumption: 30 mA
* Detection Area Diameter @ 80 cm: 12 cm
* Supply voltage : 4.5 to 5.5 V
*
*/
public class GP2Y0A21YK extends AnalogInputDevice implements DistanceSensorInterface {
public GP2Y0A21YK(int gpio) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio);
}
public GP2Y0A21YK(AnalogInputDeviceFactoryInterface deviceFactory, int gpio) throws RuntimeIOException {
super(deviceFactory, gpio);
SleepUtil.sleepMillis(44);
}
/**
* Read distance in centimetres, range 10 to 80cm.
* @return Distance, range 10 to 80cm.
*/
@Override
public float getDistanceCm() throws RuntimeIOException {
float v = getScaledValue();
return (float) (27.86 * Math.pow(v, -1.15));
}
}