Namasti,
How is everyone doing...I have a
feeling that today will be a great day :) hehe....By the way, Namasti is hello
in Hindi..Haha.... I am so excited, its family day today..me and my family are
going to Chilli's in KLCC for dinner later and maybe we will catch a movie at
TGV as well.Can't wait for it...
So, as I promised earlier that I'm
going to show all of my circuits from week 1 up till this very week. So far
there are 6 separate circuits as you can see below from Figure 1 to Figure 6.
In Figure 1, I have combined several
circuits into 1 PCB, the circuits are:
- PIC16F877A circuit
- relay circuit (to control valve)
- power supply for PIC16F877A
- LCD connection
- Switches
At first, I wanted to make 3 separate
PCB's for the circuits but it will consume more time for designing and etching
purposes. Therefore, to cut short time, I have combined a few circuits into 1
PCB as I mentioned in the list above. Refer to Figure 1 below for the
mainboard.
Figure 1: Main board
Next, Figure 2 is the relay circuit for
the motor controller. Later on, this relay will be connected to the DC motor to
on and off the motor. When the motor is switch on, it will pump in air into the
arm cuff, and when the motor is switch off, it will stop pumping in air to the
arm cuff.
In Figure 1, there are also another
relay circuit attached. This relay is use to control the solenoid valve of the
motor pump. When the relay is switch on, it will release the air out from the
arm cuff, whereas when the relay is switch off, it will stop releasing air out
from the arm cuff.
Relay in Figure 1 and 2 will
automatically take turns switching on and off. Firstly, the relay will switch
on the motor to pump in air into the arm cuff. Next, when the arm cuff is at
its maximum pressure it will switch on the valve and swich off the motor, to
release the air out from the arm cuff.
Figure 2: Relay circuit
Figure 3 is the MAX232 circuit for
interfacing purposes where I will connect a USB converter, so that the circuits
can interface with laptop or computer to display the output.
Figure 3: MAX232 circuit
Besides that, Figure 4 is the Blood
pressure circuit. It is using a Honeywell SCC05DN pressure sensor. This
circuit is for Blood Pressure measurement.
Figure 4: Blood Pressure circuit
Furthermore, Figure 5 is the
temperature circuit using LM35 to detect body temperature.
Figure 5: Body temperature circuit
Finally, Figure 6 is the Heart Rate circuit
where the circuit uses LDR and super bright LED to detect pulsating blood flow
from finger to measure heart beat per minute (bpm).
Figure 6: Heart rate circuit
That's all for now peeps.
Anyway, this week I will be having a brief demonstration to show my progress to
my supervisor, Madam Zaba. So, wish me luck people...huhu. Hope everything goes
flawlessly.
Bubye... :)
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Quotes of the day....!
"We ourselves feel that what we are doing is just a drop in the ocean. But the ocean would be less because of that missing drop."
Mother Teresa
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Regards with lots of luv,
Idriah Safriza Bte Idris Chin
