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 |
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:
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| The hot glue is put at the back sensor |
glue-side-down onto the sticky side of a piece of tape.
Once the hot glue has cooled, the tape will peel off
 |
| After the hot glue is cooled |
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.. :)
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