Week 14 (FYP 2)

                  

                  Today is the day. Today is 25 April 2013 is the big day for Final Year Project 2's student and also today is Industrial Day at Gemilang Hall because today we had been to present our project to the accessors. My accessors are Sir Tarmizi and Ass Prof Dr Zulkifli. But Dr Zulkifli cannot be attend to viva us and then madam Norhaslinawati from committee Final year project 2 student was replaced him. Students also need to demo their own projects  and present the poster has been prepared before this.

                   Finally, I was done to demo and present my project successfully. Then, for last assessments of my final year project 2, I need finishes up my FYP report  before I proceed on my Final exam before to complete my study in degree level :) Good Luck for myself

Figure 1: My Final Prototype of my project

Week 13 (FYP 2)

                By this week,  I need to complete the poster for presentation on Industrial day next week. I need to prepared the poster and need to check by my supervisor and to make the correction before I go to print the poster. On the poster also, it need to include the Introduction, Objective, Methodology, Block Diagram, Result, References and also Conclusion. By refer on poster also, people can make their own conclusion about overall of my project such as the purpose of the project, how it's work and the results of the project.

Figure 1: Poster of Electronic Stethoscope

Week 12 (FYP 2)

           By this week, I make the casing to cover circuit of my project. The casing that i have buy is ready made casing from the Jalan Pasar but, I need to pierce the casing to the LCD for easily to display the results. To pierce the casing I need to use hole punch, knife and also chisel to make a hole on casing of LCD display.

Figure 1: Process making the casing of project 

Figure 2: Prototype of Electronic Stethoscope

Week 11 (FYP 2)

               By this week, after finishes up create a PCB circuit, etching the PCB board and solder the all component on the board, I try to connect the all circuit with the operational amplifier circuit to test the circuit weather it's functioning well when combined or not functioning. When I test to put the diaphragm of stethoscope on the chest, it was display the result what I want. The result was counting after 30s diaphragm on the chest with LED was blink for a one time for a one heart beat count. But, sometime shows is not more accurate because of noise surrounding. The reading become up to 140 bpm in one time and to avoid the reading high. it need to focus deeply the diaphragm near the heart and also avoid check the heart beat in noisy surrounding.

Figure 1: Result Display

   The figure below shows the step how to use Electronic Stethoscope:

Figure 2: Diaphragm of the stethoscope attach to chest to check the heart beat

Figure 3: LCD Display when the system is turned ON

Figure 4: The result of heart beat count for a normal person

Week 10 (FYP 2)

              By this week, I try to create my flow chart of software  program. The figure below shows the flow chart of Electronic Stethoscope and the flow chart below was explained about the how program of Arduino function and how it's calculated to count the heart beat per minute. The programming not count for one minute to shows the result, but it's just calculate average for 30 second of heart beat detected by diaphragm.

Figure 1: Flow Chart of Electronic Stethoscope

This is a flow chart for this project that is Electronic Stethoscope. First of all, when the button start is pull on, the pre-scan for vibrating normal heart beats will count until 3 second. Then this programming of Arduino will divide the instruction to run 2 programs at the same time that is for the time setting 30 second and then for heart beats that is counting in the time of 30 second. Then this program with mathematical calculation will multiple with 2 for the result of heart beats per 30 second to get the output result total that is in beats per minute, then display it at LCD monitor.

Week 9 (FYP 2)

                 In this week, I try to construct circuit at PCB layout using Altium Designer Release 10- Beta software.  Altium Designer is an EDA software package for printed circuit board, FPGA and embedded Software design, and associated library and release management automation. It is developed and marketed by Altium Limited of Australia. This software is very friendly user because it's can automatic in design of circuit. It's didn't need to manually to draw the circuit to line by line as usual.

Figure 1: PCB layout of Op-Amp circuit

Figure 2: PCB layout of Arduino circuit

Week 8 (FYP 2)

                 For this Week, I try to construct the circuit of the amplifier to connect to the Arduino circuit and view the result using the oscilloscope. When I test the circuit using Op-Amp OPA 344 I get the result what I want but it's have some noise on the waveform of output result. The figure below show the output waveform get from the amplify signal from the Op-Amp OPA 344. The final circuit is the best circuit when the gain is higher enough to increasing the input signal to the output at the end of the circuit.

Figure 1: Testing circuit viewing on Oscilloscope 

                 The output waveform display on output waveform below shows the signal was amplify by the operational amplifier (OPA 334) received heart beat sound from the microphone or when output equal to '1'. The point (A) shows the signal when sensor detected the sound of heart beat and point (B) shows the no sound detected by the sensor or when output equal to '0'  but it have a some noise from the surrounding because of it have a little bit waveform from there. Then, the second figure below shows the waveform when output is received the LED on the circuit also become to turn ON.

Figure 2 : Output waveform

Figure 3: Digital Output (LED turn on)

              

                     

Week 7 (FYP 2)

                 

             By this week, I try research and to find the data sheet of Operational Amplifier OPA 344. These Op-Amp functioning as to amplify the sounds of voice or as Audio processing. the description of Op-Amp  OPA 334 is to series rail-to-rail CMOS operational amplifiers are designed for precision, low-power, miniature applications. The OPA 344 is unity gain stable, while the OPA 345 is optimized for gains greater than or equal to five, and has a gain-bandwidth product of 3MHz. The OPA 344 is optimized to operate on a single supply from 2.5V and up to 5.5V with an input common-mode voltage range that extends 300mV beyond the supplies. Quiescent current is only 250μA (max).

Figure 1: Operational Amplifier OPA 344, 345

                Rail-to-rail input and output make them ideal for driving sampling analogue-to-digital converters. They are also well suited for general purpose and audio applications and providing I /V conversion at the output of D /A converters. Single, dual and quad versions have identical specs for design flexibility. OPA 344 series op amps are unity gain stable and can operate on a single supply, making them highly versatile and easy to use. The op-amp was to amplify the sounds of voice, door knocks and so on. Other then that, the application of the op-Amp is to processing audio.

Week 6 (FYP 2)

           

                 For this week, I try to test my circuit use my old block diagram by using Op-Amp (Non-inverting), Voltage comparator (Switching  circuit) to amplify the output but it's failure because of many noise ad distortion on signal of the waveform when test using Oscilloscope. Then, I do my research to find the suitable Op-Amp to amplify the signal of sound. lastly, I found one useful webpage for my research that use Electret Microphone with Op-Amp OPA 334.  

Website: http://microcontrollershop.com/product_info.php?products_id=4535 

The website also include the schematic diagram shows as below:

Figure 1: Electret Microphone Board Schematic

               When I test the schematic circuit above it's most functioning with smooth output and I decide to use these Op-Amp OPA 334 as a amplifier compared to use the old method. The figure below shows the my new block diagram and new schematic diagram :

Figure 2: Block Diagram of Electronic Stethoscope

Figure 3 Schematic Diagram of Electronic Stethoscope

                The schematic diagram above explain detail about the block diagram and what the components use for this project and also how the flow process the project functioning. Firstly, condenser sensor receives the signal from the attached microphone stethoscope to the chest and then submitted to the operational amplifier (OPA334). After that, the Op-amp amplify the signal from the sensor before transfer data for create the program using Arduino software. Lastly, the reading of heart beat was display at the LCD.

Week 5 (FYP 2)

         By this week, I was constructed the circuit use the Microphone stethoscope and Condenser sensor as a sensor connect to op-amp (non-inverting circuit) and Voltage comparator (Switching circuit)  to amplify the signal of heart beat and using the oscilloscope to get the input waveform of heart beat signal.  Then, I was combined the circuit with the the successful done compile programm of Arduino software to try shown the result from the circuit join to the Microcontroller and try display to the LCD.

              The first one of the picture below shows the connection of the circuit for the circuit testing to check the the combination of circuit function with all Op-Amp and the second picture shown the circuit connected with the Arduino kit.

Figure 1: Circuit testing 

Figure 2: Connection of Arduino UNO

Week 4 (FYP 2)

                My progress for this week is to create programming for my Final Year Project. The three main software that I used for the project which is Arduino, Proteus 7 Professional and PCB design. The Proteus is used to build Schematic diagram, PCB is used to build connection diagram and Arduino is used to create C language program. First of all, I try to create the simple one program using Arduino to set the heart beat count per minute simultaneously. when I compile the programming it's running successfully for the software testing without connect to hardware. It's maybe have some noise or distortion when I connect to hardware after this maybe it's because of the sensor or something else on the circuit. 

            This program is really not done yet because there will be many changing in my operation or maybe I will add or changes something news for my Final Year project later. Below are the example of program that I compile using Arduino software:

Figure 1: Programming

Figure 2: Plug & Play Arduino Kit

Week 3 (FYP 2)

               In the week, I went to Jalan Pasar to purchase some of component that I use for my Electronic Stethoscope. The main part an equipment that I buy at Jalan Pasar is Arduino UNO to start create my program. I try to find Arduino Duemilanove that Microcontroller I suggest in my proposal before, but it's hard to find Jalan Pasar and lastly from my research and survey I decide to buy Arduino UNO because the method that I use for my programming is still same. At Jalan Pasar Also, I buy another equipments and components like Stetoscope, Breadboard, PCB board, Condenser Sensor, LM 411, LM 311, LM 7812, LCD Disaplay 6 x 12, Crystal, LED, Capacitor, Transistor and Inductor to start build my final year project .

Figure 1: Arduino UNO

Figure 2: Stethoscope

Figure 3: Condenser Sensor

Figure 4: Other Components

Week 2 (FYP 2)

              In this week, I attend for briefing Final Year Project semester 2 for degree student conducted by Sir Azman and Sir Halim at TTL 1 UniKL Bmi on Thursday, 31 January 2013. All student especially FYP student semester 2 cumpolsary to attend this briefing. Objective from the briefing that we get are more explanation about the project such as give the schedule or scheme of work for FYP 2 degree student and also advise to start our progress to build the project early and explain detail for doing the projects. 

Figure: Briefing conducted by Sir Azman and Sir Halim

Week 1 (FYP2)

              For this week, I start to update the my Final Year Project progress for the semester 2 with started to update my blog and to see my supervisor to get advise from her about my project. I have given suggestion by her to use other method about my block digram that I have propose in my proposal before this. After doing my research and explain to my supervisor clearly, I decide to still use my own method that I have propose before to doing my Final Year Project.

                                                   Figure 1: Schematic Diagram of electronic Stethoscope