Adding One simple project for learning

Beginner Friendly Projects/Fire Alarm Using TinkerCad/Code/Code.ino

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+// C++ code
+    //
+    void setup()
+    {
+        // Setting Pins for their tasks i.e. inputs and outputs
+
+        pinMode(A0, INPUT);
+        pinMode(A5, INPUT);
+
+        pinMode(6, OUTPUT);
+        pinMode(5, OUTPUT);
+        pinMode(4, OUTPUT);
+        pinMode(3, OUTPUT);
+        pinMode(2, OUTPUT);
+
+        // Monitoring over data using Serial Monitor
+        Serial.begin(9600);
+
+    }
+
+    void loop()
+    {
+        // reading Temperature and Gases input which are analog in nature
+        // analogRead is used to read outputs of analog devices
+        int temp = analogRead(A0);
+        int gas = analogRead(A5);
+
+        float t = -40 + (temp - 20) / 358.0 + 165;
+
+        // Following if-else statements denote a certain threshold level
+        // Above which a certain Diode is set to HIGH i.e. ON 
+
+        //digitalWrite is used for setting Diode to HIGH or LOW
+
+        if (gas > 280)
+        {
+            digitalWrite(6, HIGH);
+        }
+        if (gas > 300)
+        {
+            digitalWrite(5, HIGH);
+        }
+        if (gas > 400)
+        {
+            digitalWrite(4, HIGH);
+            Serial.println(t); // This Statement reads the temperature and  
+                               // prints on a single line of the Serial Monitor
+        }
+        if (gas > 550)
+        {
+            digitalWrite(3, HIGH);
+            Serial.println(t);
+        }
+        if (gas > 650)
+        {
+            digitalWrite(2, HIGH);
+            Serial.println(t);
+        }
+        
+        // Delay puts a delay of 100 miliseconds on Serial Monitor output
+        delay(100);
+
+        //If the smoke is not detected the LEDs must be OFF i.e. LOW state
+        digitalWrite(2, LOW);
+        digitalWrite(3, LOW);
+        digitalWrite(4, LOW);
+        digitalWrite(5, LOW);
+        digitalWrite(6, LOW);
+    }

Beginner Friendly Projects/Fire Alarm Using TinkerCad/readme.md

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+<span style="font-family:Papyrus;">
+
+# **Smoke Detection**
+
+This a beginner friendly IOT project.
+
+## **Motive** 
+To be able to detect smoke and notify the danger level using rgb lights.
+
+## **Apparatus** 
+
+*  |<span style = "font-size:18px">Arduino Uno| </span><sub> 1 pc  </sub>
+   |----------- | --------  |
+   | ![](arduiniunojpeg.jpg)|
+
+*  |<span style = "font-size:18px">BreadBoard| </span><sub> 1 pc  </sub>
+   |----------- | -------|
+   |![](breadboard.jpg)  |
+
+*  |<span style = "font-size:18px">Gas Sensor|  </span><sub> 1 pc  </sub>
+   |-----------|---------|
+   | ![](gasSensor.jpg)  |
+
+*  |<span style = "font-size:18px">Temperature Sensor | </span><sub> 1 pc  </sub>
+   |-----------|--------------|
+   |![](temperatureSensor.jpg)|
+
+* <span style = "font-size:18px">Resistors  </span><sub> 6 pcs {1 - 4 Kohms and 5 - 330 ohms} </sub>
+
+*  |<span style = "font-size:18px">LEDs| </span><sub>5 pcs</sub>
+   |-----------|----------|
+    |  Color   |    Qty.  |
+    |   Red    |   1pc    |
+    |   Blue   |   1pc    |
+    |  Green   |   1pc    |
+    |  Yellow  |   2pc    |
+
+* <span style = "font-size:18px">TinkerCad </span>
+
+    If you don't have hardware to perform this. 
+    You can try this Web Application **[TinkerCad](https://www.tinkercad.com/)**
+
+------
+
+# Circuit Diagram
+
+Make connections like below schematic.
+
+![](CktDiagram.png)
+
+Below code is simple to understand.
+
+```cpp
+    // C++ code
+    //
+    void setup()
+    {
+        // Setting Pins for their tasks i.e. inputs and outputs
+
+        pinMode(A0, INPUT);
+        pinMode(A5, INPUT);
+
+        pinMode(6, OUTPUT);
+        pinMode(5, OUTPUT);
+        pinMode(4, OUTPUT);
+        pinMode(3, OUTPUT);
+        pinMode(2, OUTPUT);
+
+        // Monitoring over data using Serial Monitor
+        Serial.begin(9600);
+
+    }
+
+    void loop()
+    {
+        // reading Temperature and Gases input which are analog in nature
+        // analogRead is used to read outputs of analog devices
+        int temp = analogRead(A0);
+        int gas = analogRead(A5);
+
+        float t = -40 + (temp - 20) / 358.0 + 165;
+
+        // Following if-else statements denote a certain threshold level
+        // Above which a certain Diode is set to HIGH i.e. ON 
+
+        //digitalWrite is used for setting Diode to HIGH or LOW
+
+        if (gas > 280)
+        {
+            digitalWrite(6, HIGH);
+        }
+        if (gas > 300)
+        {
+            digitalWrite(5, HIGH);
+        }
+        if (gas > 400)
+        {
+            digitalWrite(4, HIGH);
+            Serial.println(t); // This Statement reads the temperature and  
+                               // prints on a single line of the Serial Monitor
+        }
+        if (gas > 550)
+        {
+            digitalWrite(3, HIGH);
+            Serial.println(t);
+        }
+        if (gas > 650)
+        {
+            digitalWrite(2, HIGH);
+            Serial.println(t);
+        }
+        
+        // Delay puts a delay of 100 miliseconds on Serial Monitor output
+        delay(100);
+
+        //If the smoke is not detected the LEDs must be OFF i.e. LOW state
+        digitalWrite(2, LOW);
+        digitalWrite(3, LOW);
+        digitalWrite(4, LOW);
+        digitalWrite(5, LOW);
+        digitalWrite(6, LOW);
+    }
+
+```
+
+
+</span>