Week 13 - APC220 Radio Communication Module

As salam..

Week 13 already..
Now, I will focus on the
APC220 Radio Communication Module.

What is APC220 ?

The APC220 radio module provides a simple and
economic solution to wireless data communications.
The employment of an embedded high speed
microprocessor and high performance IC creates a
transparent UART/TTL interface and eliminates any
need for packetizing (form data into packets)
and data encoding.

Features

• Transmit distance up to 1000m @ 9600bps 
• 256 bytes data buffer
• High sensitivity (-112dbbm @ 9600 bps)
• GFSK modulation
• UART/TTL interface
• Size: 37x17x6.5mm

I had done by used this module to my 

project. Here are the results:

Heart Rate is displayed in LCD by connecting with the APC220

The measurement heart rate is displayed in serial monitor

Both of the pictures, show the measurement of

heart rate. The data is running at the same time.

How the laptop can received the data is through 

the APC220 that is plugged at the laptop like 

show in the picture below: 

APC220 plugged in to laptop

I'm also tried this transmission of data by the 

distance 1000m. It's successful... :)

Week 12 - Wifi shield is getting problem !

As salam..

Last two days, I had went to Shah Alam,
regarding on the problem of wifi shield.
The problem is like in this video :

I went back to Shah Alam to see Nik and
En.Azmi regarding on this problem.
What I found in solving this matter is :

Clicked the Terminal, for the Local echo and Local
line editting, clicked at the "Force on". Before this
it sets at "Auto". That is the reason why the problem
is happened that show in the video.

Then, you clicked open, it will be ready to type the
AT command.
Before that, we find out the IP address, gateway
and subnet. Below are some of pictures that show
the AT command. Which some of is ERROR,
and finally solved by searching in internet the right
command.

IP address is success

AT command of "AT+WAUTO.." is success

AT command of "AT + NAUTO.. " is success

Below is the AT command by looking on the 

tutorial of Putty I had :

AT command of Putty configuration

By looking on the pictures that had taken

and with the AT command, can see the different.

Some of AT commands are ERROR when type

in the Putty. So, the pictures taken are the right 

command. 

All that, by referring on this link 

http://www.dfrobot.com/forum/index.php?topic=515.5;wap2

When all the AT command is successful.

The wifi also success acted as a server.

But, other problem is come. 

It's not connected to the Arduino.

When looking on the post last week,

at the end, supposedly, the data that type 

in Putty, will be linked to the Arduino, 

but at this time, there is no connecting..

Error is found. We had tried to change the 

arduino uno, but still not connected. Searching in 

internet, if it has any solutions, but still no highlight

to solve the problem.

Finally, En.Azmi and Nik suggested, what if 

change to used a APC220 Radio Communication 

Module.The module is seems like a Xbee. 

Which a complete module with transmitter in receiver.

Here is the picture of 

APC220 Radio Communication Module.

APC220 Radio Communication Module

Since just leave 2 weeks for the presentation,

This module also relate with transmit data to 

the laptop which can view directly by a clinician.

So I've decided to buy this APC220.

Week 12 - Done on setting up the wifi shield !

As salam..

Regarding on the post last week, I had decided went
to Shah Alam to meet En.Azmi regarding on the
problem of wifi shield V2.2. I met En.Azmi and Nik,
one of person that had experienced in Arduino.

Nik helped me to set up the wifi.
At first, it still give no result.
I'm worried it might be hardware problem as
what Sir Zul said.
Nik keep tried. Alhamdulillah..
the wifi shield V2.2 is gave a response.
That means the wifi is well-functioned.

The way he sets up, he used a Putty configuration.
Which Putty also the software that functioned
same like WizSmartScript. The software is looks
like as shown below :

First step :
1)   Set the Putty Configuration with serial line
      which is the COM port and also the speed
      as a baud that fixed in 115200.

2)   Clicked "Open".
       It will show as below:

By display this, you can send AT commands to Wifi
module through your serial terminal according the
command. As you see [OK] that display in the Putty,
it's a response from the wifi. When the response is
received, means the wifi is in a good condition.

At the same time, I had be informed by Nik,
before I send the AT commands, I should find
out the IP address, gateway and also the subnet
of the wireless router.

To find it, clicked "Start", type "run" and
type cmd, and OK.
It will display the IP address, gateway and
the subnet.

When in AT commands, the end number
of IP address should change with the other
number. Like an example, IP address for
the wireless router: 192.168.10.101,
so, it need to change to 192.168.10.105
The number can be change with any
numbers.
The reason you change this IP address is
to make this wifi shield as a server.

When it is done, you put the IP address
and port in Putty configuration like below :

The port is 4000 is fixed.
As Nik mentioned, this is common port
in networking line. The, clicked OPEN.
It will display like below :

You can see the configuration is already
display the IP address that we set in AT command.
So means the wifi is already acted as a server. Then,
by opening the serial monitor, it will display
"Connect..."
when the "Welcome to dfrobot" is typed in putty,
the serial monitor will receive the "Welcome to dfrobot".

So, means the wifi is successful.
All this really helpful for me to proceed my part
by follow the instruction as Nik already mentioned
to me.
Thank you to Nik and also En.Azmi. :)

Week 11 - Wifi Shield is arrived !

As salam...

Post for the week 11..
Wifi Shield V2.2 is already arrived.

All the documentations that related with this wifi
are printed out.
The software of WizSmartScript is downloaded.
The wifi is ready to setting up.

The WizSmartScript Software

1st step:
I need to set the COM port, that is 11 and the baud
of 115200. Then clicked the "Start Script".
The result should be display as below by referring in the
set up document.

When the setting up is success will proceed on the
tutorial. The tutorial is also by using the WizSmartScript:

1)  Checked the COM port depends on your
    Arduino com port and also the baud must be 115200.
2)  Clicked "Wizard".

It will show this:

But for my part, it is not displayed as above.
Mine is appeared as shown in this video :

I've met Sir Zul regarding on this problem.
He also tried  by doing the same steps as I had done..
The result still error and when find the wizfi, still state
ERROR.
He said it might be the hardware problem.
Basically, this wifi need a wireless router.
But when to find the wifi module there is no
related with wifi router, it is related with
COM port Arduino only.

Sir Zul suggested, to call the person that I bought
this wifi. Informed them the problems.
Unfortunately, the person in charge is the seller not
a technician. So for me to communicate with the
techinician must be through an email. For sure,
it's complicated for me if not face to face.

Other solution, Sir Zul had a contact person with En.Azmi.
The person who are in experienced in Arduino.
The coincidence En.Azmi also sell this wifi shield V2.2
DF Robot. When Sir Zul informed him the status of
wifi and he gave a good response through the phone call.
I've decided to see him on the spot at Shah Alam.
I wish the wifi is going well. :)

Week 11 - SpO2 coding.....

As salam..

This week already week 11..
Sensor done !
Coding for heart rate done !
Wifi on the way....
Coding for pulse oximeter still on research...

Especially on the Arduino coding..
Actually already in month, I'm still in searching this
pulse oximeter program..
I had search in YouTube about the pulse oximeter
project. Mostly the result is displayed in waveform..
The coding mostly not share with public..
and some of are not for pulse oximeter..
but for heart rate..

I had asked my seniors that had an experienced in this
pulse oximeter. One of that I asked.. I'm explore the
coding. The coding that used is JAL program and the
measurement of pulse oximeter in this program
is same with the heart rate. So the reading for heart rate
and pulse oximeter are same.
For sure the reading of pulse oximeter is wrong here.
We know the normal reading for pulse oximeter is about
98-100.
I'm also doing my research in library which looking
on the final year report. One of is related with pulse oximeter
and that one the only used Arduino program.
The other used a PIC program but when I'm looking on
the program, it shows measurement on heart rate.

Generally, calculation SpO2 in theory is

Oxygen Saturation =  C(HbO2)/ (C(Hb) + C(HbO2) x 100%

C (Hb) = Concentration of deoxygenated hemoglobin
C (HbO2) = Concentration of oxygenated hemoglobin

The comprehension about the pulse oximeter is like below:

When the finger is placed between the light source and the light

detector, the light will pass through the finger to reach the 

detector. Part of the light will be absorbed by the finger and

the part not absorbed reaches the light detector.

The amount of light is absorbed by the finger depends on
many physical properties and these properties are used by the
pulse oximeter to calculate the oxygen saturation.

The amount of light absorbed depends on the following:

1)   Concentration of the light absorbing substance.
2)   Length of the light path in the absorbing substance
3)   Oxyhemoglobin and deoxyhemoglobin absorbs
      red and infrared light differently.

The different of absorbent of the red and infrared light
will give the different wavelength. Which the Oxy Hb is
absorbs more infrared light than red light.
For the Deoxy Hb is absorbs more red light than infrared
light. By this it can be related with the calculation in theory.
The problem here is to get in coding is a big problem
for me. Whatever it is I should find it !

Week 10 - Pulse Sensor is arrive ! :)

As salam..

Alhamdulillah..after a few weeks, the Pulse Sensor
that I had order for the last few weeks is arrived.
I received the new upgrade of Pulse Sensor.
This one is the Pulse Sensor Amped.
The different with the previous one, this new sensor
produced a nice waveform where can see the PQRST
waveform.

It's really excite me to try this one..
Before I try, as mentioned in the previous post,
I have to prepare the sensor by doing the right
technique.

Done on that, I'm trying the sensor by uploaded the
Arduino programme and the Processing.
Below is the result :

The next video is show when the sensor is out
from the fingertip:

From the videos, it proved that sensor is more 

better than old one. I mean the graph is better 

compare with the last sensor. 

Conclusion for the sensor is settle.

Just leave for pulse oximeter coding.

I need to proceed my research on the 

suitable coding.  

Week 9 - Plethysmograph.. turn to Pulse Sensor

Hello..

Regarding on the Plethysmograph circuit, my supervisor
had asked me just used a pulse sensor.
Since, I'm actually already don't have any idea to solve
the matter of the circuit, I've thinking to buy the pulse
sensor. During semester break I had make an order the
new Pulse Sensor from the U.S. For sure it takes 2 weeks
for me to receive that.

For the old Pulse Sensor I had show to my supervisor on
the problem of the sensor. What he found is the back of my
pulse sensor not glue. It supposedly glue by using hot glue.
That is the reason my sensor just function for a couple of
time. What happen if not glue the back of the sensor, it
might a short circuit.

Here is the technique to prepare the pulse sensor and I
should apply it when the new one is arrive.. :)

First step:

A thin film of vinyl to seal the sensor side

The pulse sensor is an exposed circuit board, and if
touch the solder points, it could short the board or
introduce unwanted signal noise. The vinyl sticker
offers very good protection for the underlying circuit,
and rate it 'water resistant' that means:
It can stand to get splashed on.

Second step:

The hot glue is put at the back sensor

While the glue is still very hot, press the Pulse Sensor

glue-side-down onto the sticky side of a piece of tape.

After the hot glue is cooled

Once the hot glue has cooled, the tape will peel off

very easily. Check and make sure that there are not

exposed electrical connections. 

Next, trimming the extra glue at the side sensor.

This is final look of the sensor after glue

Then stick the velcro dot at the back of glue sensor 

and make a finger strap with velcro tape. Both of this 

things are included in the packet of Pulse Sensor.

The Pulse Sensor is make as the finger strap

The Pulse Sensor is ready to use.. :)