I tried building a heart rate sensor by using red LED and LDR as well as IR LED and phototransistor pair.....and holding a finger between the LED and the respective sensor.....
In case of LDR i am not getting anything at the output....What could be the reason..?
In case of phototransistor the pulses are too many to be heart beats.....
I havent done any amplification or filtering as yet....
Can anybody suggest which method is better and provide me a ckt diagram if possible....thank you..
In case of LDR i am not getting anything at the output....What could be the reason..?
In case of phototransistor the pulses are too many to be heart beats.....
I havent done any amplification or filtering as yet....
Can anybody suggest which method is better and provide me a ckt diagram if possible....thank you..