Looking for a professional timer(range from 1sec to 10hrs)

[hassan1980]

About professional timer

I want a timer with one output the range for this timer is from 1 second to 10 hours or simmilar.

 

[DarkJedi]

Re: About professional timer

USe 555

Configure it to the 1 second time and the rest is built up based on counters to reach the times you want.

 

[hassan1980]

Re: About professional timer

USe 555

Configure it to the 1 second time and the rest is built up based on counters to reach the times you want.

I want professional timer using microcontroller like pic, atmel or avr.

 

[IanP]

Re: About professional timer

A good starting point is to build a microcontroller-based digital clock, familiarize yourself with hardware and software, and once you feel comfortable with this initial project modify it and convert it to a professional timer - still retaining its clock function.
Here is a link to a site with a digital clock based on a 8-bit microcontroller with 8051-core: **broken link removed**
As it is based on the 8051-core you are not "stuck" with this particular microcontroller .. you can use any other microcontroller from AVR, Dallas etc etc ..

Alternative project is based on PIC microcontroller:
**broken link removed**

Have a look at the above sites and if you have further questions .. just ask ..

Good luck ..

 

[shafee001]

Re: About professional timer

hi , you may use 16F84A,
use the follwoing code, wich provides you with delays from 250 micro sec up to 20 sec, you may develop the code to get longer delays using the same theory

	org 000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;

MSEC1:
	movlw 0x09
	nop
MICRO4:
	addlw 0xff
	btfss status,z
	goto MICRO4
	return
MSEC250:
	movlw 0xFA
	movwf 0x0c
pos1:
	call MSEC1
	decfsz 0x0c,f
	goto pos1
	return
SEC1:
	movlw 0x60
	movwf 0x0d
pos2:
	call MSEC250
	decfsz 0x0d,f
	goto pos2
	return
SEC5:
	MOVLW 0X05
	MOVWF 0X0E
POS3:
	BTFSS PORTB,0
	RETURN
	CALL SEC1
	DECFSZ 0X0E,F
	GOTO POS3
	RETURN
	end
SEC10:
	MOVLW 0X0A
	MOVWF 0X0F
POS4:
	BTFSS PORTB,0
	RETURN
	CALL SEC1
	DECFSZ 0X0F,F
	GOTO POS4
	RETURN
SEC20:
	MOVLW 0X14
	MOVWF 0X0A
POS5:
	CALL SEC1
	DECFSZ 0X0A,F
	GOTO POS5
	RETURN