Received PPG from My Supervisor

Dear All,

Actually today i'm not feeling well, it have been 2 days of dizziness and i don't have mood to have my lunch and dinner. Well, that's life. I met my supervisor this afternoon at 2.30 pm because he asked me to take the PPG devices. Before handover to me the PPG, we discuss a bit about the PPG and circuit need to be constructed.

Inside the PPG there are LED DC Current Source and Photodetector, while the end of its is 9 pin "D" connector of male. The brand of the PPG is NELCO oximeter finger probe. Sir Saiful Yusri which is my supervisor explained to me about the functions of the connecter pin which is as table below:-

Connector End Pin	Pin Name	Description
9	Phototransistor cathode	Green wire
5	Phototransistor anode	White wire, phototransistor detects level of IR and/or red light transmitter through the finger
2	LED1	Red wire, anode of the IR LED, cathode of the red LED
3	LED2	Black wire, cathode of the IR Led, anode of the red LED

Those are important configuration pins because all of its link to the filter circuit, amplifier and interface with microcontroller.

To make this works, we need IR LED current stabilizer LED current is between 5mA and 40mA. We will used LT1932 circuit for it. Therefore, for the transimpedance, we choose this because photodiode will produces a strong tendency for the amplifier to go into oscillation at some high frequency above the gain bandwidth cutoff. This problem can be eliminated by adding a small capacitor in the feedback loop, which lowers the gain at very high frequencies. For the filter circuit we'll we use the Sallen-Key Low Pass Filter which are buffer circuit. And the output of it will interface with the microcontroller which will send the signal to the Smartphone using GSM.

That's all for now......See you again...Will come back in next week probably..

Project Proposal Preparation

Week 13,

Day pass by really pass, now is week 13, and we have to prepare for project proposal which need to be submit by next week. Actually, the my proposal have been prepared for the last 3 weeks before, and at this week i just need to check it all and see which part i should add more. Below are my contents of the proposal.

Contents

1.0 introduction.. 2

1.1 About Heart Rate. 2

1.2 What is Photoplethysmography?. 2

1.3 Background of the Project. 3

2.0 problem statement.. 4

2.1 Design that Inhibits the Ability. 4

2.2 Expensive. 4

2.3 Limit Range. 4

3.0 aim and objectives. 5

4.0 project scope and limitation.. 6

4.1 Project Scope. 6

4.2 Limitation.. 6

5.0 expected outcome. 7

6.0 literature review... 8

6.1 References from Article. 8

6.1.1 Title: Portable Heart Rate Detector Based on PPG with Android Programmable Devices for Ubiquitous Health Monitoring System... 8

6.1.2    Title: Wearable Wireless Photoplethysmography Sensors. 8

6.1.3     Title: A Wireless Cardiovascular Monitoring Device and Its Clinical Tests. 9

6.1.4  A Real-Time Cardiac Arrhythmia Classification System with Wearable   Sensor Networks  9

7.0 methodology.. 10

7.1 Android Application.. 10

7.2 Wearable Sensor. 11

Android Digital Processing of the Heart Rate

I'm wondering how is it the algorithm to process the signal of the output from the PPG. This is kind of new things for me because, i'm not to sure how the data will be processed. So then, i'm thinking about to make a flow chart as below:-

The most important is the peak detection as the result that will be used as heart beat rate per minute.

Receiving Few Articles from My Supervisor

Thanks to my supervisor, he had giving me few article regarding the information about the PPG, wireless communications technology and a bit about the Android Programmable Devices information.

The first article is "Portable Heart Rate Detector Based in Photoplethysmography with Android Programmable Devices for Ubiquitous Health Monitoring System. This article  explain about miniature portable heart rate detector system is implemented by modern hardware IC's and simple sensor circuit with software executable on bot PC and Android platform. The biosignal is first extracted via PPG principle into electric signal. Then a microprocessor is used to convert biosignal from analog to digital format, suitably for feeding into an RF module. On the receiver end, the computer or smart phone can analyze data using robust algorithm that can detect peaks of the PPG waveform, hence to calculate the heart rate. Some application software running in windows and android phone have been developed to display heart rate information and time domain waveform to users for health care monitoring. This article also state that the data can be sent to compute console using existing networks (3G,2G,4G,WiFi,etc) for health databese logging purpose.

From this article, it is explained more about the project.. Thanks for keep updating at my blog.....