PIC Based Timer

[BoyAlgoa]

Hi Guys,

ask ko lang po sana kung meron na ditong gumawa ng PIC-Based Timer (with 2 x w/ 7 segment). Gusto ko po sanang gumawa ng 2-digit Hour Timer. Ilalagay ko lang po sana as replacement sa Mechanical TImer ng Aircon ko, nasira na kasi eh...Please help me kung pano po sisimulan....Kailangan ko po ng Reset, Up/Down Functions....Salamat po

[paranz]

ask lang po, do you have background sa PIC programming?

[0b00000111]

Hi Guys,

ask ko lang po sana kung meron na ditong gumawa ng PIC-Based Timer (with 2 x w/ 7 segment). Gusto ko po sanang gumawa ng 2-digit Hour Timer. Ilalagay ko lang po sana as replacement sa Mechanical TImer ng Aircon ko, nasira na kasi eh...Please help me kung pano po sisimulan....Kailangan ko po ng Reset, Up/Down Functions....Salamat po

baka mas makamura ka kung bili ka na lang ng power-on delay na may built in timer.

[rdpzycho]

baka mas makamura ka kung bili ka na lang ng power-on delay na may built in timer.

kilala ko gumagawa dito niyan...

[0b00000111]

kilala ko gumagawa dito niyan...

mukhang madami kang kilala dito ah

[rdpzycho]

hindi ko lang alam kung nandito sila sa forum...hehehe...

[Mentor Lee]

I have done it once during my early days with PIC. I used mikroPascal & PIC16F628A with 4x 7S LED & 4 common anode driver transsistors + few buttons.  Now I have the same question as Paranz's: Do you have PIC background? 

[BoyAlgoa]

ask lang po, do you have background sa PIC programming?

Basic PIC Software Routine lang po and some hardware functionalities...Ask ko lang po sana kung pano ko sisimulan....thanks

[paranz]

make the hardware first. You may use a PIC16F84a with the 2 7-segment and maybe a 7-segment driver like 74LS47

[BoyAlgoa]

San po kukunin ang clock nya? sa crystal lang po ba? bawat digit po sana ay hour counter....pano ko po kya un idedeclare sa pic basic?

[rdpzycho]

pwede sa clock (using Timer), pwede ring sa AC line (like what some alarm clocks do)...

[Ikasamoko]

I think this is what you're looking for?

http://www.interq.or.jp/japan/se-inoue/e_pic6_3.htm





RBT

[Mentor Lee]

I recommend the use of timer register. The line frequency is not stable and will give big time drifts. Plus, you have to be dependent on the line - this will be a concern if you run on battery. If the cost doesn't concern you much at the moment, yes you can use external 7sd decoders but an 18pin PIC is enough for four digits. 

[rdpzycho]

I recommend the use of timer register. The line frequency is not stable and will give big time drifts.

true sir...laging advance tuloy yung alarm clock dito sa kwarto namin...

[Mentor Lee]

Hindi ka nag-iisa,    yung alarm clock ko , SONY pa naman na may kasamang radio..naku after 3 days around 20 minutes ang drift - what a waste

['yus]

ok na ang mga yan.. kesa naman sa di sila mag-alarm.. hehe 

[Ikasamoko]

if you're into precision timing go for xtal controlled or even oven stabilized time based generator...pero kung di naman critical timing application you can opt to a simpler one..don't complicate your life..


RBT

[BoyAlgoa]

I think this is what you're looking for?

http://www.interq.or.jp/japan/se-inoue/e_pic6_3.htm





RBT

Bosing thanks ng marami, sige check ko and pag aralan na rin ung anatomy nya....

[gerisonic]

Hindi ka nag-iisa,   yung alarm clock ko , SONY pa naman na may kasamang radio..naku after 3 days around 20 minutes ang drift - what a waste

Baka sa other country mo nabili yan at 50Hz ang reference frequency nila. Mabilis talaga ang takbo nyan if dito sa pinas 60Hz ang gamit natin.

[Mentor Lee]

I bought that one in HongKong (50Hz) during one of my family's holidays. When I came back to Vietnam which is also 50Hz, ganyan na ang performance nya. My wife tried it there in Pnas, lo & behold, mas malaki ang drift - 2+ hours in one whole day  . Actually, sinauna siguro yung design nya. Na attract lang ako kasi nga SONY. Most of the digiclocks now are having standalone time chips. Lesson and lesson, kahit matanda na tayo, we still have to learn lessons