How to write a C Program for a ON and OFF relay

ON and OFF relay program. when initializing the PIC the Microcontroller should be energised, closing NO contacts

Well isn't it just an, IF, THEN, ELSE, condtional statement?

In a real relay current will flow in the contacts or not depending on the state of the coil, IF the coil is energized, THEN A = 1, ELSE A = 0

Obviously the state of A would determine something else.

That is nice contribution Albin,
I'm glad to be part of this forum

Yah, so the relay is coonected to PORT RA3 of the PIC16F887 though switching transistor, so it must be able yo communicate with PIC. so i nid a C program

I mid a C program 4 a relay

When you say "communicate" what do you mean? Via a serial connection to the PIC -- from what? A PC, a terminal, a ???

When you say "ON and OFF relay" what do you mean? A relay that periodically cycles on and off, or a relay that energizes in response to some condition that is "communicated" to the PIC, or ???

You need to be more specific. Give some details about what it is that you want to achieve.

Also, it would help to know what C compiler you plan to use, as each handles initialization, fuse config. typedefed register names/mappings, and other such preliminaries differently.

I use MikroC Pro, so if you are using a different compiler, I can only give you generalities. You will need to "fill in the details" as befits that compiler's idiosyncrasies. Also, if what you have in mind is more than just a simple case, I may have to limit my shares to hints.

Hi

Suggest best methods to achieve this are as follows

1 Circuit diagrams or schematic first
2 Flow chart diagrams
3 Algorythm plain english
4 Before you think C think assembler becuase this teaches you pic architecture
5 Try pic basic much easier to use and a good starting point

Here are some addresses that will assist you immensley

www.crownhill.co.uk
www.sourceboost.com
www.edrawsoft.com

Further to this ive just posted a project on the site complete with visual front end written in Csharp.net with circuits plus pcb layouts all you could ever need to gain understanding of how to achieve this

Hope this helps

Mark Harrington

Here are the rest of the flow chart diagrams which is exactly how you approach this challenge

Before it slips my mind Amicus18 is available for download free and crownhill offer a very nice developement board for the 18F series of pic micro controllers I also highly reccomend this package as well which has proved very usefull to me another good start point for anyone whishing to produce thier own designs

Protues Proffesional available from
http://www.labcenter.co.uk

Again hopes this helps you as it has me

Good stuff, appropriate disciplined Engineering approach!!

Thank you earl I thought Id attach this which encompasses not only engineering but also presentation as well as enhancing webpage skills
You will need 7zip to extract files The start page is named
Index.