Symptoms Detector (Pseudo - covid19)

This is my try to help, I made it to inspire and to share my idea. It works only to detect the symptoms and not the covid19 itself.

IntermediateWork in progress2,131

Things used in this project

Hardware components

5 mm LED: Green

LED, Blue

5 mm LED: Red

High Brightness LED, White

Buzzer

OPTIONAL

MQ-9 Sensor

Arduino UNO

Axial Fan, 12 VDC

Jumper wires (generic)

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Plier, Needle Nose

Story

Clarification since people are not reading all the article !!!

This is my try to help, I made it to inspire and to share my idea. it works only to detect the symptoms and NOT the covid19 itself.
My major problem was and remain - to unique the disease from it's symptoms. Enjoy reading.

Lets begin:

⚙️"Pseudo" COVID19 Detector, Using MQ-9 sensor. Calibration was made using:Fresh air 🌬, cool air(using 5v DC fan) 💨, fire(from a matches)🔥.How it works 🛠:

1)Calibration of the MQ-9

2)Exposure to fresh/cool/hot air (as shown in the dynamic plot- the high jump is due exposure to dense air- smoke)

How the graph looks like depending on Temperature/Air density

3)Calculation which transforms the air pressure/density to temperature4)if the temperature is between 36.6C-37.6 - everything is fine, otherwise the LEDS (4):[blue-common cold-sneezed nose, red-Fever, green-High particles density, white-Low particles density] are on.

So, Why "pseudo"? Well since it was never really tested on humans and i'm quite sure it is working but not necessarily for corona virus for example it can detect:Fever, common cold etc... by mistake ❌

MQ-9 Specifications📝: https://www.electronicoscaldas.com/datasheet/MQ-9_Hanwei.pdf

[Recommendation: open dynamic plotter while testing]

How to Calibrate the MQ-9 sensor:

[full guide: https://create.arduino.cc/projecthub/electropeak/how-to-calibrate-use-mq9-gas-sensor-w-arduino-e93cb1?ref=search&ref_id=MQ-9&offset=3 ]

Diagram (special thanks to ElectroPeak)

General knowledge about MQ- X sensors:

I hope you will find this project practical, fun and maybe improve it from pseudo detector to a TRUE detector!

Roy.

Code

/* 
 MQ9 
 Last modified on 27 March 2020 
 by Roy Ben Avraham 
*/ 
const int LED = 2; 
const int DO = 8; 
void setup() { 
 Serial.begin(9600); 
 pinMode(LED, OUTPUT); 
 pinMode(DO, INPUT); 
} 
void loop() { 
 int alarm = 0; 
 float sensor_volt; 
 float RS_gas; 
 float ratio; 
//-Replace the name "R0" with the value of R0 in the demo of First Test -/ 
 float R0 = 0.99; 
 int sensorValue = analogRead(A0); 
 sensor_volt = ((float)sensorValue / 1024) * 5.0; 
RS_gas = (5.0 - sensor_volt) / sensor_volt; // Depend on RL on yor module 
 ratio = RS_gas / R0; // ratio = RS/R0 
//------------------------------------------------------------/ 
 Serial.print("sensor_volt = "); 
 Serial.println(sensor_volt); 
 Serial.print("RS_ratio = "); 
 Serial.println(RS_gas); 
 Serial.print("Rs/R0 = "); 
 Serial.println(ratio); 
 Serial.print("\n\n"); 
 alarm = digitalRead(DO); 
 if (alarm == 1) digitalWrite(LED, HIGH); 
 else if (alarm == 0) digitalWrite(LED, LOW); 
 delay(1000); 
}

/* MQ-9 testing
 *  Last modiefication 27-3-2020
 *  Roy Ben Avraham
 this section is for each parameter we detect for example: blue led- common cold for another led? another section, try to customize it for your own usage, good luck.
 */
void setup() {

  pinMode(A0, INPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  Serial.begin(9600);
}

void loop() {

 int sens = analogRead(A0);
 if(sens >= 220){
  digitalWrite(13, HIGH);
  delay(4000);
  digitalWrite(13, LOW);
  digitalWrite(12, HIGH);
  delay(4000);
  digitalWrite(12, LOW);
  digitalWrite(13, HIGH);
  delay(4000);
  digitalWrite(13, LOW);
  digitalWrite(12, HIGH);
  delay(4000);
  digitalWrite(12, LOW);
 }else{
  digitalWrite(13, LOW);
 }
 Serial.println(sens);
}