Detecting rising edge

dope40 · Sep 30, 2012

Hi , i'm building a tachometer for school and its using 5v pulses, and i need to :
1 count the rising edges in 1/10 of a second
2 multiply the result by 600 so i get the rev/min
3 display the result on a 16x2 lcd

i know how to display the result , but i don't know how to detect and multiply them.

Tahmid · Sep 30, 2012

Which microcontroller are you using? You should be able to use the external interrupt feature of the microcontroller to detect rising edge. Multiply by 600 can simply be done in software.

dope40 · Sep 30, 2012

I'm using PIC16f628a to do that but i dont know what to write in the code, i want to write it in C or BASIC

Tahmid · Sep 30, 2012

You should be using the RB0/INT interrupt. It is mentioned in page 110 of the datasheet. Take a look here: https://pic16f628a.wordpress.com/2012/02/26/using-the-int-external-interrupt/

Have you previously used the interrupt feature of the PIC16F628A?

You could also use the Capture module, but only for detecting the pulses, it may be overkill.

Hope this helps.
Tahmid.

dope40 · Sep 30, 2012

i have never used the interrupt feature of the PIC16F628A , but i will see what i can find about it

arun_9998 · Oct 18, 2012

dope40 said:
Hi , i'm building a tachometer for school and its using 5v pulses, and i need to :
1 count the rising edges in 1/10 of a second
2 multiply the result by 600 so i get the rev/min
3 display the result on a 16x2 lcd

i know how to display the result , but i don't know how to detect and multiply them.

witch mcu wants to use ?

Detecting rising edge

dope40

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Detecting rising edge

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