Using Nokia LCD

[Gusse]

Very nice! Now printing to Nokia LCD is definitely easier.
Thank You and Darrel!

[fratello]

Hi again !
Based on the schematic from post #119 I wrote the code from the thermostat ; but nothing happening when I push button on pin 7, or 8, or 9. I know that something is wrong, but I need help...Thanks in advance for every reply !

[ScaleRobotics]

Hello fratello,

Can you tell us if there are any parts that do work? It is always easier to trouble shoot if you know where to start.

Like:
Can it blink an LED, or are we unsure if it is even starting up?
Does it print to the LCD, and just not give you the temperature, or is the LCD blank?

[fratello]

Thanks for reply !
The display show like in picture from post #116. But pushing the buttons '+' , '-' or 'Mode' has no effect.

[ScaleRobotics]

Hello Fratello,

I have been looking over your code for a while now. I have not found anything obvious to me, although there may be something obvious to others.

One thing I did notice, is that your MainLoop will cycle through modes 0, 1, and 2, even without any buttons being pressed. This is fine, but one thing you are doing in mode 2, and after mode 2, is writing to the eeprom. At 4 mhz, you will reach that 1,000,000 write cycles quicker than you think (have not calculated it, but if this is really going to be a thermostat, I assume it is going to be running for a while). A better way to do it would be to only write the targettemp, etc to the eeprom when targettemp is different than the eeprom value for targettemp (ie, it has been adjusted).

Seems like the next step is to see if the 16f628a even knows if the buttons have been pressed. Why not make a simple light an LED line inside some of your if then statements to verify the chip knows a button has been pressed? This could help point to the source of the problem.

Walter

[fratello]

The code works PERFECT with LCD 2x16...I just try to insert the parts for Nokia display...(and removing, of course, the parts for other display). I think the problems are generated by wrong 'substitution'. Thanks anyway for reply !

[ScaleRobotics]

That's great! If it is working perfectly with the 2 x 16 lcd, you should be seeing the new changed values in your eeprom. This should be an indication that only your LCD_3310 code is bad, and that the thermostat functions are working!

[Archangel]

Hi fratello, Do you have pullup resistors on those switches ? You do not have WPU enabled, so you need them, or change the Option_Reg, to enable them.

[fratello]

Me again !
I found the mistake ; after MainLoop the code must be :
If PortB.3=0 then ; this is the missing line
If PortB.3=0 then MainLoop
...
...
Endif
Endif

Work correct on pushing MODE button , but...
Now I have another problem... I attach the code for display the temperature in both cases (LCD 2X16 ; N3310).
How do I convert this line :
LcdOut $FE, $C0, "OUT ", Sign, DEC (Temperature2 / 100), ".", DEC2 Temperature2, " ",223,"C "
for correct results on Nokia display ?
DEC (Temperature2 /100) it's what char ?
DEC2 Temperature2 it's what char ?
I try many codes but on display appears numbers and strange characters....
Thanks !