1~7 April 2013 (Week 11)

-Constructing of the circuit :

-This circuit use op-Amp by High Pass Filter and Low Pass Filter , i have already mentioned the differences between these tow types of filter in the last week , for this week progress i have already constructed the circuit and now is the time for testing the circuit whether its working or not , but so far the construction of the circuit is good , now will upload some of the photos as you can see below :

-After the circuit was well constructed now will try to test it using the oscilloscope to see the whether the signal is accurate or not and get the value of the peak-peak as you can see below the picture off the testing :

-From this testing i just could not  the reason why there is no signal at all because if there is no signal thats mean there is something wrong with construction of the circuit , i have already checked the continty of the circuit and everything was there ... offft why i cant get the signal .

-In this situation i need to recheck the input voltage :

-From the photos above i have got the signal already , yay! so happy , i got it after changing the IC into 07c .

-Now need to test the sensor itself with and see if can get the signal from the oscilloscope here some photos from the testing :

 

this signal by using the prop from the fingertip  , its the signal of the PPG but itss very small , 

-This prop i have made it by myself to test it because the real one i didn't want to use , anything might happen while testing so i got the idea of making a almost similar to the real one , so the signal above is from the prop that i have made and the signal is quite acceptable , that was for the testing apart only.