Heart Beat Sensor with lpc2148

[marthoma]

im using heart beat sensor by sunrom technologies........
https://www.sunrom.com/186 is the link to my module...it gives me a digital output...wen i interfaced my device wid lpc i was getting a fluctuated output varying between 70-120...so could someone please help me with the coding part to count the pulses..i think the delay part in my code is the problem..so if someone could teach me how to use timers here to count pulses then it would be helpful please....i was not using any timers in my code which is not good i know..please help me with the registers and programming

 

[marthoma]

please could someone help me.....ask me again if i have not got my problem

 

[embpic]

output varying between 70-120

Means exactly what?
Is it pulses?
Or value?

 

[D.A.(Tony)Stewart]

The sensor MPU computes pulse and outputs BPM directly. It works on refelection of IR LED to photo sensor of blood pulse flow.

 

[milan.rajik]

The sensor outputs pulses and so you can connect the OUT of sensor to External Interrupt pin of MCU and on every trigger of interrupt increment a counter. On first pulse start timer, discard first pulse, count pulses till 1 min elapsed, stop timer.

**broken link removed**

http://www.ocfreaks.com/lpc2148-interrupt-tutorial/