16 x 2 LCD Problem?

[Speedy2k]

Hi guys, the question is not flowcode related, but i know you are all pretty awesome in helping, so here is the problem. I have a Canakit UK1133 board with a PIC 16F616 MCU on it. It is used to control motor with PWM. I have modified the board to remove the frequency potentiometer and put a hall effect input at this place so i can closed loop control the motor with rpm feedback. Everything works flawlessly exeot for the lcd part. There is a pin header port for an external LCD, normally they use a 8 x 2 LCD they are selling, but i want to use a 16 x 2 i have here. I have recreated the complete (exact) schematic to a breadboard with a lcd conected directly to the breadboard and everything is working, the LCD initialize and show what i have programmed, but as soon as i connect it to the pin header port to a flat cable connector to the LCD, i got the power but the LCD never get initialized. I have verified everything 100x time pinout is perfect it have traced pin per pin to make shure all connection are OK and they are. So now the question is, does a 1 meter flat cable run is too long for the LCD display ? This is the only thing i can think of right now ? Or maybe any other suggestion will be really appreciated. thanx a lot!

[Enamul]

Yes, 1m cable is too long for LCD data transmission..I have seen problem in sending LCD data over long wires. If you tested your LCD and it works fine except when you connect to the header, wire length could be an issue. By the way, contrast control and RS, En and R/W all pins are connected properly..although you said you checked everything.

[Speedy2k]

I have read that for longer wire loweringvthe frequency of the signal sent to the lcd will help.
Is there a way to do that with Flowcode?

[Steve001]

this may help

http://www.matrixmultimedia.com/mmforum ... f=2&t=7387

Steve

[Benj]

Hello,

To lower the frequency to the display select the LCD on the panel and click custom code.

Edit the defines code section and change this delay to match your new desired frequency.

Code: Select all

#ifdef _BOOSTC
  #define %a_DELAY   delay_10us(10)
#endif

For example, this would increase the delay by a factor of 10.

Code: Select all

#ifdef _BOOSTC
  #define %a_DELAY   delay_10us(100)
#endif