Week 15 Final Year Project 2

Date: 9 May 2018

Time: 12.00 p.m

Place: Medical Section Level 5


Objectives:

- To demonstrate my final result and product to my supervisor in order to achieve A in FYP 2 that have my own work of contribution and something different. The own idea and work of integrity in my project to be a good product especially. 

Activities:

- Today, I demonstrate my project to my supervisor at medical section level 5 as an evidence that supervisor agreed with what I have achieved. After I was demonstrated, my supervisor told me that I was performed excellently. I had been asked to do the journal about my project and the prototype. This is because my sensors were worked very well and high sensitivity to detect smoke and also gas leakage such as benzene. The small amount of smoke can be detected by the MQ-135 gas sensor within 101-150 of API air quality. So, I was achieved my objectives to improve accuracy and sensitivity of the sensors.

- For the conclusion, the MQ-135 gas sensor is suitable for air quality monitor for sensitive gas such as benzene, alcohol, and smoke. The advantages of this sensor is a very fast response and recovery, have adjustable sensitivity and signal output indicator. The output voltage boots along with the concentration of the measured gases increases. Besides that, it is low cost and suitable for different applications. Basically, the gas sensors have heating purpose inside the sensor which is made up of aluminum oxide and tin dioxide. It has heat coils to produce heat, and thus it is used as a heat sensor.

Week 14 Final Year Project 2

Date: 2 May 2018

Time: 9.00 a.m

Place: Gemilang Hall Unikl BMI


Objectives:

- To present the prototype of final year project 2 (FYP 2) during Industry Day to the assessors at the gemilang hall Universiti Kuala Lumpur British Malaysian Institute. 


Activities:

-  Today, I have to demonstrate my project as a prototype to my assessors which are from lecturer Unikl Bmi, Madam Sabrina Mohamad and research engineer from Uniten Melaka. The two assessors will see my project and give some comments during the presentation. During the presentation, I was able to explain every part of the poster such as introduction, flow chart, results and objectives. I explain why I didn't use the ppm formula (parts per million) as detecting the carbon dioxide gas and smoke release in the surroundings. I use air pollutant index as a reference to show the level hazardous of the air quality. The API is developed in easily understood ranges of values as a means of reporting the quality of air instead of using the actual concentration of air pollutants.

 - This index also reflects its effect on human health ranging from good to hazardous and also can be categorized according to the action criteria as stipulated in the National Haze Action Plan. The Malaysian API system closely follows the Pollutant Standard Index (PSI) developed by the United States Environmental Protection Agency. So, I set the minimum good air quality status that below than 100 API to show normal condition of the air when no smoke or leakage gas in the surroundings. The yellow Led will light up to alert the user if there any smoke detected. When the air quality more than 101 API, so the status is hazardous and immediately the buzzer will produce sound and red Led light up. My project is easily to understand and user friendly compared the other project. 

Week 13 Final Year Project 2

Date: 27 April 2018

Time: 3.00 p.m

Place: Medical Section Level 5


Objectives:

- To design the circuit with sensors as a prototype aid with Led and buzzer notifications in detecting the smoke or leakage gas.

Activities:

- Today, I am designing the circuit for the notifications by using the LED lamp and buzzer when the gas sensor detects the carbon dioxide gas and smoke in the surroundings. It is useful to alert the users when the reading is high at the limit set by light up the LED and sound from the buzzer. There are two LED's that indicate the air quality is good condition and hazardous condition in yellow LED and red LED. When the air quality was hazardous, the led will light up to alert the user and buzzer also sound. The buzzer turns off after air quality back to normal condition with yellow Led light up. 

- The diagram above shows the complete circuit that I designed it to give the alert to the user in monitoring temperature, humidity, and carbon dioxide. There is a buzzer and LED in one complete circuit. While the diagram below, it shows the LED notifications when air quality is high and low. 

- The yellow LED light up to show the air quality is good condition while the LED light up in hazardous condition. This is a good solution to give the alert if the leakage gas or on fire in the hospital ward and buildings. For the future, it can upgrade the system by using the fan to fan out all the gas hazard in the surroundings.

Week 12 Final Year Project 2

Date: 18 April 2018

Time: 3.00 p.m

Place: FYP level 5 room 


Objectives: 

- To test the MQ-135 gas sensor with the smoke from soldering iron and observe the reading as the output. 

Activities:

-  Today, I want to test again the MQ-135 gas sensor to get the accurate value when it detects the carbon dioxide gas and smoke from soldering iron. Before this, this sensor did not get the value because the connection of the sensor (analog pin) was connecting to another pin. So, today the gas sensor is connecting to the analog pin of ESP 8266 nodeMcu. When I was connected the analog pin of the gas sensor to the analog pin of ESP 8266 nodeMcu, there was a reading output in normal condition. Normally, MQ135 is mainly used to detect the concentration of carbon dioxide, alcohol, benzene, NOx, ammonia and other gases in the air. 

- The diagram above shows the smoke from soldering fumes to detect the smoke and carbon dioxide gas by the MQ-135 gas sensor. When the sensor detects the smoke, the output reading was increased as an analog output. It was shown that the connection was successfully correct and the sensor worked properly. The sensitivity of the gas sensor at digital pin can be calibrated by using the potentiometer. I notice that the power LED on the module was glowed and when no gas it detected the output LED will remain turned off meaning the digital output pin will be 0V. 

 

- The diagram was showing above the reading when the smoke and carbon dioxide gas detected by the gas sensor to the surroundings. When there is an increase in polluting gases, the resistance of the gas sensor decreases along with that. These sensors have to be kept on for pre-heating time before I can actually work with it. I read the analog values (0-5V) using a microcontroller, this value will be directly proportional to the concentration of the gas to which the sensor detects.  I can experiment with this values and check how the sensor reacts to different concentration of gas and develop my program accordingly.