Dimmer

**Atom058** · - 11th October 2006, 22:54

Mister-E - No harm done! Thanks for the quick response! I will give it a try tonight and we'll see what happens.

Atom058

**Atom058** · - 12th October 2006, 01:56

I was trying to program a PIC12F675 to work with this dimmer design and I am obviously missing something. I copied the code from the Dimmer example and it was not working so I moved to a breadboard to do some testing. I can not even make an output on these PIC's go high! I know I am missing something but I can't imagine what it is! Here is the code - as simple as it is:

@ DEVICE INTRC_OSC_NOCLKOUT & WDT_ON & MCLR_OFF & PWRT_ON & BOD_ON

PAUSE 500
CMCON=7 ' Disable analog comparator
ANSEL=0 ' Disable analog converter

TRISIO = %11111111
TRISIO.0 = 0
TRISIO.1 = 0
TRISIO.2 = 0
TRISIO.3 = 0
TRISIO.4 = 0

HIGH GPIO.0
HIGH GPIO.1
HIGH GPIO.2
HIGH GPIO.3
HIGH GPIO.4

Start:
GOTO Start

END

Now, correct me if I am wrong, but I should be able to measure 5V at each of the 5 outputs above. I get nothing. I have tried several PICs and get the same results. I've written hundreds of programs for different PICs and this one has beaten me. I know the solution is unbelieveabley simple, but GEEZ!

**sayzer** · - 12th October 2006, 03:35

Originally Posted by Atom058

...
@ DEVICE INTRC_OSC_NOCLKOUT & WDT_ON & MCLR_OFF & PWRT_ON & BOD_ON...

Hi Atom,

First thing, try these instead of the line above.

Code:

@ DEVICE pic12F675, INTRC_OSC_NOCLKOUT 
@ DEVICE pic12F675, WDT_ON
@ DEVICE pic12F675, PWRT_ON
@ DEVICE pic12F675, MCLR_OFF
@ DEVICE pic12F675, BOD_ON
@ DEVICE pic12F675, CPD_OFF
@ DEVICE pic12F675, PROTECT_OFF

These should fix your problem.

Second thing, GP3 is an input-only pin. Never goes high.

----------------------

**mister_e** · - 12th October 2006, 03:37

Your @ device line is faulty...
If you'e using PM to compile your code you must use something like

Code:

@ device  pic12F675, intrc_osc_noclkout, wdt_on, mclr_off, protect_off

With MPASM

Code:

@ __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _CP_OFF

OUPS! SAYZER WHY YOU REPLYED AT THE SAME TIME

i know this one is familiar to you

**sayzer** · - 12th October 2006, 06:13

Hi Steve,

As you well know, it took about a month for me to figure out that this line does not work:

@ device intrc_osc_noclkout, wdt_on, mclr_off, protect_off

It should be either like
@ device pic12F675, intrc_osc_noclkout, wdt_on, mclr_off, protect_off
or
like

@ DEVICE pic12F675, INTRC_OSC_NOCLKOUT
@ DEVICE pic12F675, WDT_ON
@ DEVICE pic12F675, PWRT_ON
@ DEVICE pic12F675, MCLR_OFF
@ DEVICE pic12F675, BOD_ON
@ DEVICE pic12F675, CPD_OFF
@ DEVICE pic12F675, PROTECT_OFF

**Atom058** · - 12th October 2006, 23:32

Thanks guys! I knew I would be embarrased by the solution and I was right!

OK, Now I have made the circuit change and have made the switch changes. I get the 5V outputs on pins GPIO.0 and .1 which go low when I press the up or down buttons. I do not, however, get any output from GPIO.2 which is the triac trigger. My guess is that the problem lies in the ACDetect routine. I see in previous posts that there were many references to this routine and it went through several revisions. Can someone verify that I have the correct routine?

I have attached the code as a text file and the circuit design as a pdf. Would appreciate comments.

Thanks again! Atom058