Darkroom Timer with PIC16F84AP chip - Electronic Circuits Projects Diagrams Free

NewcastleSAR · 27th September 2007, 10:09 AM

Hi folks..

I'm looking at building the Darkroom timer at:

http://www.electronics-lab.com/proje...019/index.html

but am having problems obtaining the PIC16F84AP chip. Is it possible to use a PIC16F62X chip?

If so, which version do I need and what mods would I have to do.

Many thanks

Declan

**Nigel Goodwin** · 27th September 2007, 10:20 AM

The 16F84 was replaced by the 16F628 last century, there was a migration document at MicroChip - but it's so long ago it doesn't appear to be there any more?. Essentially it's a drop-in replacement - just assemble the source code for the new processor - make sure you set the fuses correctly though.

You do need to add a couple of lines to turn OFF the comparators (see my tutorials which all include these lines), and I would check the GPR start address (again my tutorials include the correct value for the 628).

NewcastleSAR · 27th September 2007, 10:52 AM

Cheers Nigel..

Thanks for that. Off now to speak to our Internet Guys. They blocked your site in the school

Regards

Declan

**Nigel Goodwin** · 27th September 2007, 11:00 AM

Quote:

Originally Posted by NewcastleSAR

Cheers Nigel..

Thanks for that. Off now to speak to our Internet Guys. They blocked your site in the school

Was it too popular?

NewcastleSAR · 27th September 2007, 12:12 PM

Nah!!

I was hoping to tell you it was categorised as 'adult material' but have just discovered:

This website has been categorised as "Freeware and Software Download".

Declan

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27th September 2007, 10:09 AM	(permalink)
NewcastleSAR	Darkroom Timer with PIC16F84AP chip Hi folks.. I'm looking at building the Darkroom timer at: http://www.electronics-lab.com/proje...019/index.html but am having problems obtaining the PIC16F84AP chip. Is it possible to use a PIC16F62X chip? If so, which version do I need and what mods would I have to do. Many thanks Declan

27th September 2007, 10:20 AM	(permalink)
Nigel Goodwin	The 16F84 was replaced by the 16F628 last century, there was a migration document at MicroChip - but it's so long ago it doesn't appear to be there any more?. Essentially it's a drop-in replacement - just assemble the source code for the new processor - make sure you set the fuses correctly though. You do need to add a couple of lines to turn OFF the comparators (see my tutorials which all include these lines), and I would check the GPR start address (again my tutorials include the correct value for the 628). __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

27th September 2007, 10:52 AM	(permalink)
NewcastleSAR	Cheers Nigel.. Thanks for that. Off now to speak to our Internet Guys. They blocked your site in the school Regards Declan

27th September 2007, 12:12 PM	(permalink)
NewcastleSAR	Nah!! I was hoping to tell you it was categorised as 'adult material' but have just discovered: This website has been categorised as "Freeware and Software Download". Declan