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