com.diozero.devices.TMP36 Maven / Gradle / Ivy
package com.diozero.devices;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: TMP36.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 - 2020 diozero
* %%
* 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
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*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* #L%
*/
import com.diozero.api.AnalogInputDevice;
import com.diozero.api.ThermometerInterface;
import com.diozero.internal.provider.AnalogInputDeviceFactoryInterface;
import com.diozero.util.RuntimeIOException;
/**
* Support for reading temperature values from a
* TMP36 Temperature Sensor by Analog Devices
*/
public class TMP36 extends AnalogInputDevice implements ThermometerInterface {
private float tempOffset;
/**
* @param deviceFactory Device factory to use to construct the device.
* @param gpio GPIO on the ADC device.
* @param tempOffset Compensate for potential temperature reading variations between different TMP36 devices.
* @throws RuntimeIOException If an I/O error occurred.
*/
public TMP36(AnalogInputDeviceFactoryInterface deviceFactory, int gpio, float tempOffset)
throws RuntimeIOException {
super(deviceFactory, gpio);
this.tempOffset = tempOffset;
}
@Override
public float getScaledValue() throws RuntimeIOException {
return getTemperature();
}
/**
* Get the current temperature in °C.
* @return Temperature in °C.
* @throws RuntimeIOException If an I/O error occurred.
*/
@Override
public float getTemperature() throws RuntimeIOException {
// Get the scaled value (voltage)
float v = super.getScaledValue();
return (100 * v - 50) + tempOffset;
}
}