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You will require a mod 24 counter ,you can make it by using a mod 4 followed by mod 6 counter, and then by selectively gating the input signal every time the counter counts 4 you can get the desired signal.
As you are using reflective method, red light might give you better reception as absorption of Redlight is low in oxygenated haemoglobin and hence more reflection. However availability of highly sensitive and compact receivers for red light is another factor...
CNY70 uses Infrared.
Apart from...
Yeah, you can get those but they won't be cheap.
try crystal or piezo microphones those are less noisy, however they are prone to handling noise.
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The outputs from transducers are generally very weak and for...
Yeah piezoelectric sensors are costly....
The most compact and low cost you can get is CNY70 (7x7x6 mm) which includes both IR emitter and receiver so no more extra modules required.
you can use it on the skin to detect heart rate by reflective method.
The main source of noise you will get will...
Hi
My guess is that you are using IR or red light for detecting the heart beat.
the best sensor would be CNY70 it is a reflective optical sensor with a plastic enclosing which reduce noise coming from ambient light.
However you could also try L14F1 which gave higher higher sensitivity when I...
In a semiconductor all the carriers have exponential dependence of temperature .
At mid range temperatures ,
the concentration of extrinsic carriers dominate and are larger than intrinsic carriers by factor of (10^x,x=1,2,3...)
however at high temperatures intrinsic carriers dominate.
now as...
Hi
I have been working on Zigbee for quite sometime now,as far as I know zigbee being a Inter-operable standard, all zigbee modules in 2.4ghz band must support a speed of 250kbps not above, in order to ensure inter-operablity from different manufacturers.
The chip you have suggested is unique as...
I'm not a expert but since I was involved in a similar project I can give you some idea...
Carrier Generator------------------------|
bit stream --> band limiting filter --> mixer circuit --> channel -->Envelope detector --> comparator with threshold...
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