Detecting rising edge

[dope40]

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]

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]

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]

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]

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

 

[arun_9998]

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 ?