setting values and percentages

[HenrikOlsson]

How about

PWMValue = Percentage */ 10483

?

[Scampy]

Bit of a fudge, but it works well enough

'*******************************************************************************
' Set Brightness levels for each channel


brightness:

B_max = (4095/100)*maxbright

Lcdout $FE,2
LCDOUT $FE,$80,"Set Max Brightness"
IF H_butt = 0 THEN GOSUB up
IF M_butt = 0 THEN GOSUB down

If maxbright  = 100 then
LCDOUT $FE,$C0,"Channel 1 "
LCDOut $FE,$D4,#maxbright,"%"
endif

If maxbright  =0 or maxbright <10 then
LCDOUT$FE,$C0,"Channel 1 "
LCDOut $FE,$D4,dec1 maxbright,"% "
endif

if maxbright >=10 and maxbright <100 then
LCDOUT$FE,$C0,"Channel 1 "
LCDOut $FE,$D4,dec2 maxbright,"%   "
endif
     
If S_butt = 0 then
    pause 100 
    goto brightness2
endif 
goto brightness



brightness2: 
 
W_max = (4095/100)*maxbright

Lcdout $FE,2
LCDOUT $FE,$80,"Set Max Brightness"
IF H_butt = 0 THEN GOSUB up
IF M_butt = 0 THEN GOSUB down

If maxbright  = 100 then
LCDOUT $FE,$C0,"Channel 2 "
LCDOut $FE,$D4,#maxbright,"%"
endif

If maxbright  =0 or maxbright <10 then
LCDOUT$FE,$C0,"Channel 2 "
LCDOut $FE,$D4,dec1 maxbright,"% "
endif

if maxbright >=10 and maxbright <100 then
LCDOUT$FE,$C0,"Channel 2 "
LCDOut $FE,$D4,dec2 maxbright,"%   "
endif

pause 200
If S_butt = 0 then
    pause 100 
    LCDOUT $FE,1   
    goto mainmenu
endif
goto brightness2

up:
    maxbright = maxbright + 1
    IF maxbright >= 100 THEN maxbright = 100
    pause 250
RETURN
down:
    maxbright = maxbright - 1
    IF maxbright <= 0 THEN maxbright = 0
    pause 250
RETURN

Again, the lack of floating point maths in PBP means the calculations are not exact, but this way every 1% increment equals a block of 41 steps on the PCA chip, so 50% brightness = 2050 but that's close enough to the 2047 is should be and to be honest I doubt if the human eye could distinguish the difference

[HenrikOlsson]

Hi,
If it works it works.
If you want it a little better PWMValue = Percentage */ 10483 will give you 2047 at 50%.

/Henrik.

[Scampy]

So using my variables B_max = (4095/100)*maxbright would that be

B_max = maxbright */10483

Nope - that don't work

[HenrikOlsson]

If B_Max is the value you send to the PWM controller (0-4095) and maxbright is the percentage value (0-100) as entered by the user then yes.
Actually, at 100% it'll give you 4094 so make that B_max = maxbright */10484 instead.

/Henrik.

[Scampy]

If B_Max is the value you send to the PWM controller (0-4095) and maxbright is the percentage value (0-100) as entered by the user then yes.
Actually, at 100% it'll give you 4094 so make that B_max = maxbright */10484 instead.

/Henrik.

Yes - B_max and W_max are the values that are sent to the PCA chip (0 - 4095). And maxbright has a value between 0 and 100 as you assumed. But using that line of code the values for B_max and W_max do not change from the pre-programmed default of 4095 after the menu option is used to change the max brightness level

[HenrikOlsson]

Hi,
Strange..... I tested the following code

HSEROUT["Program start",13]
For i = 0 to 5
    Lookup2 i,[1, 10, 25, 50, 75, 100], maxbright
    B_max = maxbright */ 10484
    HSEROUT ["Maxbright: ", DEC3 maxbright, "     B_Max: ", DEC4 B_max, 13]
NEXT

And got the following results:

Program start
Maxbright: 001     B_Max: 0040
Maxbright: 010     B_Max: 0409
Maxbright: 025     B_Max: 1023
Maxbright: 050     B_Max: 2047
Maxbright: 075     B_Max: 3071
Maxbright: 100     B_Max: 4095

Seems to work fine here....

/Henrik.

[EarlyBird2]

the values for B_max and W_max do not change from the pre-programmed default of 4095 after the menu option is used to change the max brightness level

Is the default of 4095 inside the main loop and resetting B_max and W_max after the menu option returns to the main loop.