Week 7 - Journal

Programs 

Material Kits 

Searching 

While exploring ideas to decorate the desk, I came across a desk organizer that can hold items like phones and pens. I decided to use this concept and modify it to create a smart version 

Connecting Ultrasonic and write its code. 

1- I downloaded fritzing app. 

2- I used the breadboard, Arduino, ultrasonic and downloaded the other components then import them to be able to use them.

2- I connected the Echo pin to pin 2, the Trig pin to pin 3 on the Arduino and ground and VCC to breadboard.

 3- I repeated the setup with the real kit by connecting the trig to pin 3 and the echo to pin 2.

3- I researched how to use the ultrasonic sensor and found that it requires a library, so I installed the NewPing library in the Arduino IDE.

4- From the Arduino IDE, I opened File → Examples → NewPing → NewPingExample, then edited the code to set Echo = 2 and Trig = 3 and added Serial.begin(9600);

6- Verify the code then download it on the Arduino. 

7- I checked the sensor’s readings through the Serial Monitor by moving my hands forward and backwards. 

Connecting the bulb with the Relay Module and write the code 

1- Open File → Examples → Control → If statement conditional.

2- Copy the if condition code and past it in the Void loop. 

3- Edit the name of the Led to be Relay _Pin & distance to be 100cm 

4- Define the Relay at the pre setup as Relay_Pin.

5- Write Relay _Pin mode as output in the Void set up.

6- Edit the if condition and the name of the Relay Pin in the void.

7- Verify the code then download it on the Arduino.

8- The code successfully operated both the sensor and the bulb. 

Connecting the MDT sensor with Arduino.

1- Open File → Examples → DHT sensor Library → DHT tester.

2- Edit the DHTpin to be 8.

3- Edit type of the sensor to be 11 instead of 22. 

4- Verify the code then download it on the Arduino.

5- Run the code while viewing the Serial Monitor and vary the heat to observe the increase in temperature.

Connecting the MDT sensor with Fan and Arduino.

1- Set Fan_pin to pin 9 in the initial setup.

2- Add a pinMode declaration to configure Fan_pin as an output.

3- Copy if condition as done in the distance so that when the temperature exceeds 30°C, the fan turns on.

4- Choose serial monitor and verify the code.

5- Upload the code to Arduino and test it and works as if conditions. 

Actual wiring.

1- I connect the relay with same pins on Arduino In pin to 9 & VR to 5v then connecting it first to breadboard.

2- Connect the common pin of relay of with negative power supply.

3- No pin to the negative of the fan and GND to negative part in the rail.

4- Positive of the fan to the positive power supply. 

5- Connect the DHT Data pin with pin 8 in Arduino then GND to the negative rail of bread board then VCC to positive rail that is connected to 5v in the Arduino. 

6- Connect the common pin of relay of with negative power supply.

7- On to any of the sides of the bulb as it is bipolar. 

8- Connect ultrasonic sensor to the Arduino and breadboard with the mentioned pins. 

9- upload the code from Arduino and check working. 

1- The first issue I faced while uploading the code because it showed an error that Pincode was not declared. After reviewing the code, I realized that the letter P was capitalized instead of lowercase. Once I corrected it with writing it p, the code uploaded successfully. (shown below)

2- Second challenge was, the temperature wasn’t displaying correctly, so I consulted my colleagues, and they pointed out that I needed to use Serial.print in order for the temperature to appear.

Solution: - 

Serial.print("Temperature: ");   

Serial.print(t);  

Serial.println(" °C");  

3- I was not able to find relay module on tinker Cad and my colleague advised me to download fritzing app and import the components I need to be used in the connections. 

The tasks I completed this week will greatly support my final project, especially in linking the DHT sensor and fan to the Arduino and writing the appropriate code for them, since they are an essential part of the laptop’s cooling system.

This week assignment is useful because my final solution involves connecting a fan to a temperature sensor to reduce high temperature and I might use multiple fans to improve heat reduction.