PWM for heating car's exterior mirrors

[Acetronics2]

Just found these ones ...
http://www.qualityanswers.net/electr...505e61b391a003
http://www.elforum.ro/viewtopic.php?f=11&t=37981

yess ... too bad

Alain

[maciu1]

Acetronics, if you have usefull ideas about my initial request, by my guest. Else, please, don't pollute my post with your amazing discoveries regarding old posts sent from others forums. You're so hard to follow...

[ismellsmoke]

Just a beginner myself, but seeing as you're still looking for help, I'll give it a stab.

I did a similar project to the one you referenced, except I used a 12F683. The main difference being that the 12F683 has one CCP pin, which means you can use the HPWM command and save a lot of headaches.

I also used an LM34 which does temp. in fahrenheit.

Here is the code which should be pretty easy to modify for your purpose:

'This program uses a 12F683 chip wired as follows:
'Pin 2 (GPIO 5) - Status LED          Pin 7 (GPIO 0) - to LM34 Temp sensor 
'Pin 3 (GPIO 4) - Low Speed LED       Pin 6 (GPIO 1) - high speed LED
'Pin 4 (GPIO 3) - Not used (MCLR)     Pin 5 (GPIO 2) - pwm to fan mosfet

' Defines: 

    DEFINE	ADC_BITS	10	' Set number of bits in result
    DEFINE	ADC_CLOCK	3	' Set clock source (3=rc)
    DEFINE	ADC_SAMPLEUS  50	' Set sampling time in uS
        
' Registers:

TRISIO = 1
ANSEL = %00010001      ''Fosc/8 conversion speed  for 4mHz processor, AN0 analog input
CMCON0 = 7
ADCON0.7 = 1           'Right Justified (10 bit conversion)


'Variables:

Raw_Temp var word
Temp Var word
Avg_Temp var word
LED1 var GPIO.5
LED2 var GPIO.4
LED3 var GPIO.1
X var byte

Raw_Temp = 0
Temp = 0
X = 0

'Program Start:

LED1 = 1      'Always on status light  
   
START:
    LED2 = 0
    LED3 = 0  
    HPWM 1,0,1000
    Gosub GETDATA
        IF TEMP => 95 THEN GOTO MOTORSTART
    PAUSE 5000
    GOTO START
    
MOTORSTART:   'Starts motor at full speed
    HPWM 1,255,1000
    PAUSE 1000
        GOTO THIRTY
         
THIRTY:
    hpwm 1,77,1000
    LED2 = 1
    LED3 = 0  
        GOSUB GETDATA
        IF TEMP < 92 THEN GOTO START
        IF TEMP > 105 THEN GOTO SEVENTY
    PAUSE 5000
    GOTO THIRTY

SEVENTY:
    HPWM 1,180,1000
    LED2 = 1
    LED3 = 1
        GOSUB GETDATA
        IF TEMP < 100 THEN GOTO THIRTY
        IF TEMP > 115 THEN GOTO FULL
    PAUSE 5000
    GOTO SEVENTY
    
FULL:
    HPWM 1,255,1000
    LED2 = 0
    LED3 = 1
        GOSUB GETDATA
        IF TEMP < 110 THEN GOTO SEVENTY
    PAUSE 5000
    GOTO FULL
    
GETDATA:
   Avg_Temp = 0
     for x = 1 to 5   'Hysteresis by averaging 5 samples  
        ADCIN 0,RAW_TEMP
        pause 5
        Avg_Temp = Avg_Temp + Raw_temp
        pause 1000
        next x
     TEMP = ((Avg_Temp/5)*49) / 100    'Farenheit conversion
     PAUSE 50
'     SEROUT GPIO.4,4,["      Temp  ",#Temp,13,10]   'For debugging
    RETURN
    
END

[Acetronics2]

see next ...

[Acetronics2]

Acetronics, if you have usefull ideas about my initial request, by my guest. Else, please, don't pollute my post with your amazing discoveries regarding old posts sent from others forums. You're so hard to follow...

Hi, Maciu

I have ONE useful idea for you ...

Stop always begging and try some googling instead ...

BTW ... LM35 AND 12F675 remind me to have crossed such applications on the web ... may be not PBP ( ? - one sure in Mikro C - ) , but, as you are just begging for code ... Hex file will be more than enough !

Alain

PS: I hate lazy beggars ... but you already knew it
re PS : lazy ???

I prove it : http://www.picbasic.co.uk/forum/showthread.php?t=12794

[Acetronics2]

the next part of the puzzle ...
http://jeanclaude.grimaldi.perso.sfr...ePWMdouble%29/

Alain