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# MQSensorsLib

We present a unified library for MQ sensors, this library allows to read MQ signals easily from Arduino, Genuino, ESP8266, ESP-32 boards whose references are MQ2, MQ3, MQ4, MQ5, MQ6, MQ7, MQ8, MQ9, MQ131, MQ135, MQ303A, MQ309A.

<!-- TABLE OF CONTENTS -->
## Table of Contents

* [Getting Started](#Getting-Started)
* [Wiring](#Wiring)
  * [Sensor](#Sensor)
  * [Arduino](#Arduino)
  * [ESP8266 or ESP-32](#ESP8266-ESP32)
* [User Manual](#Manuals)
* [Sensor manufacturers](#Sensor-manufacturers)
* [Contributing](#Contributing)
* [Authors](#Authors)

## Getting Started

```
//Include the library
#include <MQUnifiedsensor.h>
/************************Hardware Related Macros************************************/
#define         Board                   ("Arduino UNO")
#define         Pin                     (A4)  //Analog input 4 of your arduino
/***********************Software Related Macros************************************/
#define         Type                    ("MQ-4") //MQ4
#define         Voltage_Resolution      (5)
#define         ADC_Bit_Resolution      (10) // For arduino UNO/MEGA/NANO
#define         RatioMQ4CleanAir        (4.4) //RS / R0 = 60 ppm 
/*****************************Globals***********************************************/
//Declare Sensor
MQUnifiedsensor MQ4(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin, Type);
// Setup
MQ4.setRegressionMethod("Exponential"); //_PPM =  a*ratio^b
MQ4.setA(1012.7); MQ4.setB(-2.786); // Configurate the ecuation values to get CH4 concentration
MQ4.setR0(3.86018237); // Value getted on calibration
// Loop
MQ4.init();
MQ4.update();
float ppmCH4 = MQ4.readSensor();
```

## Wiring
### Sensor
#### Important points:
##### Points you should identify
* VCC -> 5V Power supply (+) wire
* GND -> GND Ground (-) wire
* AO -> Analog Output of the sensor
##### Data of board that you should have
* RL Value in KOhms
##### Graph
![Wiring_MQSensor](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/Points_explanation.jpeg)
#### RS/R0 value (From datasheet of your sensor)
* RS/R0 (Clean air - English) -> (Aire puro - Spanish)
* **Note**: RS/R0 is equal to Ratio variable on the program
![Graph from datasheet](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/Graph_Explanation.jpeg)
### Arduino
![Arduino_Wiring_MQSensor](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/MQ_Arduino.PNG)
#### MQ-7 / MQ-309A
** Note ** [issue](https://github.com/miguel5612/MQSensorsLib/issues/26): MQ-7 and MQ-309 needs two different voltages for heater, they can be supplied by PWM and DC Signal controlled by your controller, another option is to use two different power sources, you should use the best option for you, next i will show the PWM option and on the examples this will be the way .
![MQ-7_MQ-309](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/MQ-309_MQ-7.PNG)
### ESP8266-ESP32
![ESP8266_Wiring_MQSensor](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/MQ_ESP8266.PNG)

### Manuals
#### User Manual (v1.0) 12.2019
[Manual](https://drive.google.com/open?id=1BAFInlvqKR7h81zETtjz4_RC2EssvFWX)
#### User Manual (v2.0) 04.2020
[Manual](https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/Docs/MQSensorLib_2.0.pdf)


### Serial debug (optional)
If your sensor is an **MQ2** (Same for others sensors):
* To enable on setup wrote
```
MQ2.serialDebug(true); 
```
* And on Loop Wrote
```
MQ2.serialDebug(); 
```
* Result:

![Serial debug output](https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/static/img/Serial_Mon_Explanation.jpeg?raw=true)

**Note**: 
* ![#c5f015](https://placehold.it/15/c5f015/000000?text=+) `Yellow -> Calibration status.`
* ![#008000](https://placehold.it/15/008000/000000?text=+) `Green -> Hardware and software characteristics.`
* ![#f03c15](https://placehold.it/15/f03c15/000000?text=+) `Red -> Headers of the library calculations.`
* Only valid for **1** gas sensor readings.

**Usage**
* Quick troubleshooting, since it shows everything the library does and the results of the calculations in each function.

### Prerequisites

You'll need Arduino desktop app 1.8.9 or later.

### Sensor manufacturers:
| Sensor | Manufacture | URL Datasheet |
|----------|----------|----------|
| MQ-2 | Pololulu| [datasheet](https://www.pololu.com/file/0J309/MQ2.pdf) |
| MQ-3 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/MQ-3.pdf) |
| MQ-4 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-4.pdf) |
| MQ-5 | parallax | [datasheet](https://www.parallax.com/sites/default/files/downloads/605-00009-MQ-5-Datasheet.pdf) |
| MQ-6 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-6.pdf) |
| MQ-7 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf) |
| MQ-8 | Sparkfun | [datasheet](https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Biometric/MQ-8.pdf) |
| MQ-9 | Haoyuelectronics | [datasheet](http://www.haoyuelectronics.com/Attachment/MQ-9/MQ9.pdf) |
| MQ-131 | Sensorsportal | [datasheet](http://www.sensorsportal.com/DOWNLOADS/MQ131.pdf) |
| MQ-135 | HANWEI Electronics | [datasheet](https://www.electronicoscaldas.com/datasheet/MQ-135_Hanwei.pdf) |
| MQ-303A | HANWEI Electronics | [datasheet](http://www.kosmodrom.com.ua/pdf/MQ303A.pdf) |
| MQ-309A | HANWEI Electronics | [datasheet](http://www.sensorica.ru/pdf/MQ-309A.pdf) |

### Info of datasheets 

Review WPDigitalizer [folder](https://github.com/miguel5612/MQSensorsLib_Docs/tree/master/WPDigitalizer) [website](https://automeris.io/WebPlotDigitizer/)

### Installing

Clone this repository into your desktop machine

```
git clone https://github.com/miguel5612/MQSensorsLib
```


## Running the tests

Use calibration systems if you have several sensors that read the same gas.

### Break down into end to end tests

These tests can re-adjust values defined previously and you can contribute to improve conditions or features obtained from particular scenes.

```
Examples/MQ-3
```

### And coding style tests

These tests may generate statistics validation using descriptive tools for quantitative variables.

```
Examples/MQ-board.ino
```

## Built With

* [Data sheets](https://github.com/miguel5612/MQSensorsLib_Docs/tree/master/Datasheets) - Curves and behavior for each sensor, using logarithmic graphs.
* [Main purpose](https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/static/img/bg.jpg) - Every sensor has high sensibility for a specific gas or material.

## Contributing

Please read [CONTRIBUTING.md](https://github.com/miguel5612/MQSensorsLib/blob/master/CONTRIBUTING.md) for details on our code of conduct, and the process for submitting pull requests to us.

## Reviewers

* **PhD. Jacipt Alexander Ramón Valencia** [CV](https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0000512702)

## Authors

* **Miguel A. Califa U.** - [*GitHub*](https://github.com/miguel5612) - [CV](https://scienti.colciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0000050477)
* **Ghiordy F. Contreras C.** - [*GitHub*](https://github.com/Ghiordy) - [CV](https://scienti.colciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0000050476) 
* **Yersson R. Carrillo A.** - [*GitHub*](https://github.com/Yercar18/Dronefenix)  - [CV](https://scienti.colciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0001637655)

## Collaborators

* **Andres A. Martinez.** - [*Github*](https://github.com/andresmacsi) - [CV](https://www.linkedin.com/in/andr%C3%A9s-acevedo-mart%C3%ADnez-73ab35185/?originalSubdomain=co)
* **Juan A. Rodríguez.** - [*Github*](https://github.com/Obiot24) - [CV]()
* **Mario A. Rodríguez O.** - [*GitHub*](https://github.com/MarioAndresR) - [CV](https://scienti.colciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0000111304)

See also the list of [contributors](https://github.com/miguel5612/MQSensorsLib/contributors) who participated in this project.

## License

This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details

## Cite as

* Plain text: Califa Urquiza, Miguel Angel, Contreras Contreras, Ghiordy, & Carrillo Amado, Yerson Ramiro. (2019, September 3). miguel5612/MQSensorsLib: Arduino Preview V1.03 (Version 1.0.3). Zenodo. http://doi.org/10.5281/zenodo.3384301
* CSL: {
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.3384301", 
  "title": "miguel5612/MQSensorsLib: Arduino Preview V1.03", 
  "issued": {
    "date-parts": [
      [
        2019, 
        9, 
        3
      ]
    ]
  }, 
  "abstract": "<p>Publishing on Zenodo platform as software in order to extend its applications for other works allowing to recognize MQSensorLib&#39;s Authors this work into scientific community using Digital Object Identifier System (DOI).</p>", 
  "author": [
    {
      "family": "Califa Urquiza, Miguel Angel"
    }, 
    {
      "family": "Contreras Contreras, Ghiordy"
    }, 
    {
      "family": "Carrillo Amado, Yerson Ramiro"
    }
  ], 
  "version": "1.0.3", 
  "type": "article", 
  "id": "3384301"
}
* BibTeX: 
@misc{califa_urquiza_miguel_angel_2019_3384301,
  author       = {Califa Urquiza, Miguel Angel and
                  Contreras Contreras, Ghiordy and
                  Carrillo Amado, Yerson Ramiro},
  title        = {miguel5612/MQSensorsLib: Arduino Preview V1.03},
  month        = sep,
  year         = 2019,
  doi          = {10.5281/zenodo.3384301},
  url          = {https://doi.org/10.5281/zenodo.3384301}
}


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