external interrupt interval

[imran mahmood]

how many times external interrput can be executed in 1 second,infact i made cloth measuring meter using wheels and sensor.it works fine at 1000 pulses/min but when i give it  2000 pulses/min it does not show actual value,it seems hardly can count 1200 pulses /min.i am using 12 mhz crystal

 

i am using external interrupt ,can someone tell me the frequency of exteral interrpt in 1 second or solution for my problem

[AJISH ALFRED]

I think, it depents on how long your ISR takes to finish executing.

At 2000 pulses per second, may be you are generating the next interrupt before the previous interrupt’s ISR returns.

[imran mahmood]

I AM USING 2000 PULSES PER MINUTE NOT PER SECOND.MY MECHNICAL WHEEL GIVE 10 PULSES AFTER 1 METER CLOTH PASSED.I WANT A SPEED 200 METER PER MINUTE.CAN I DO IT WITH EXTERNAL INTERRUPT?

[AJISH ALFRED]

Thats more than 30 pulse per second. Which controller are you using?

What all things are you doing in the ISR? If possible, share the code in your interrupt ISR.

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