Soldering station

[fratello]

A new, working fine too, version...

if buton = 0 then 
mode = mode + 1
gosub memo
endif


gosub check
Pause 100                
Goto Main

and

memo:

if mode = 1 then
 gosub poz
 char = 17
 call    PrintChar
endif

if mode = 2 then  
 gosub poz
 char = 15
 call    PrintChar
 calibra = vt
endif

if mode = 3 then 
 gosub poz
 char = 18
 call printchar
endif

if mode > 3 then 
  mode = 0
 gosub poz
 char = 16
 call printchar
endif

return
'===============================================================================
check:
SELECT CASE  MODE
CASE 1
PWM MOSFET, 255, 300
CASE 2
    if w1 < (calibra-1) then 
          pwm mosfet, 155, 200      
             else
        low mosfet 
    endif
CASE 3
LOW MOSFET
END SELECT

Still have BIG thermal inertia of iron soldering (about 7-8 degree)...

[SKOLS1]

where do you buy Nokia 3310 LCD displays?Can you put a link to the store?Thanks
Do you use Solomon SL-10 soldering iron?

[fratello]

Yes, I use Pensol SL10. The display it's from " people sell everything don't need anymore " ... about 1 euro.

[mister_e]

FTR, Nokia 3310 or 5110 are basically the same. they use PCD8544 controller. Seems there's no longer a load of 1-2$ deal 'round here... probably because they are so popular

[HenrikOlsson]

Hi,
A fullblown PID is probably overkill but, for the record, incPID_mc is the multichannel version of the PID-filter. It works fine with a single channel but it takes a lot more codespace than the original incPID routine.

You can find v1.5 of the single channel version in this post. And with THAT said it still won't fit the 12F675 due to the limited amount of RAM available in that device.

What I'd do is probably something in the line of what Jerson showed but I'd also add a bias or feedforward based on the setpoint (not the error). If you know that in order to maintain a temperature of say 250°C you need a dutycycle of 40% then, once you're within the window of the regulator you enable the P(I) regulator and add the bias/feedforward to the output.

You'll need to work out a suitable bias/feedforward "gain" since it's not going to be perfectly linear. Since the system (probably) heats up faster than it cools down and you can't have "negative drive" you should err on the low side for the bias/feedforward so that IT alone can never drive the temp OVER the setpoint. If it does the regulator can't bring it down since it can never go "below" 0% PWM.

/Henrik.

EDIT: The original version of incPID, which can be found i post 1 in the thread above, compiles to 314 words on the 12F675 and uses 29 bytes of RAM. Depending on how many bytes of RAM your application uses it MIGHT fit but again, it's probably not worth it.

[Archangel]

Depending on how many bytes of RAM your application uses it MIGHT fit but again, it's probably not worth it.

Hello Henrik,
Probably not in Sweden or the USA, but in Romania, it might be very well worth it. Import tax is high there, wages not so much . . . Thanks for helping him.
JS

[fratello]

Thanks to all for support !!! Glad to see people helping others...
I will take attention to inc_PID, but ... now my code is 1002 words . The best (so far) solution it's to "upgrade" the PIC (maybe 18F...) but, for moment, I will try to keep this "low-cost variant".

[SKOLS1]

Yes, I use Pensol SL10. The display it's from " people sell everything don't need anymore " ... about 1 euro.

Which program you use to make the "DIGITAL" text?Can you make a tutorial or something like that so I can learn something.
I buy 3 Nokia 3310 mobile phones for 2euros.And now I have 8 of those in my lab

[mister_e]

probably http://en.radzio.dxp.pl/bitmap_converter/

You draw you screen at the right size (84x48 pixels) in Photoshop, MsPaint (whatever floats your boat), save it as monochrome BMP, then import it in the software, generate the table, then import it in your code.

EDIT: also check this out
http://www.picbasic.co.uk/forum/cont...Nokia-3310-LCD