Am new to arduino but know alittle about programming from my work with PLC, the case is that i got and old OP7 panel from siemens its got a LCD i took out and its this one: http://www.mikrocontroller.net/topic/254693
Wintek WD-G1003P
It got 20-pins (21 if you count the last one that isnt connected), only 1 chip on the back and i read somewhere that it should be completible with HD44780.
I tried hook it up with LiquidCrystal lib, LCD4bit and alot of diffrent libs but not once have i had a char on it.
Tried 4bit and 8bit mode still nothing, and with wiring i tried some diffrent setups with and without pot now i have soldered some wires on the display so i dont have any lose ends.
With the program i tried LiquidCrystal HelloWorld demo with diffrent setups, also tried others but still no luck.
Looked on this forum for about 2 weeks and almost tried it all.
Is it the right pinout ? what mode should i focus on ? wrong lib ?
I know its working cause when i plug it in the old op7 panel it writes something in the display.
I got very long balls by now so any good advise will be much appreciated..
You have to get the single row of blocks (two rows if this is a four line display) showing before you try to go any further. This means you only deal with pins 1, 2, and 3 for the time being.
Have you gotten the backlight to work? Some devices are almost impossible to see without a backlight but this does not look like one of those.
Have you found an English language datasheet?
You may need to jumper some pins to disable the RS232/RS422 interface.
You may have an 'extended temperature' device in which case you will need to provide a negative voltage for pin 3.
Have you gotten the backlight to work? Some devices are almost impossible to see without a backlight but this does not look like one of those.
Yea the backlight is working fine.. Pin 15 GND and Pin16 +5v
Have you found an English language datasheet?
Havent found any datasheet.. the language isnt important
You may need to jumper some pins to disable the RS232/RS422 interface.
Hmmm i know the device(Siemens OP7 Panel) has that interface but i doubt that the LCD print has, but i got 4 pins(pin 17,18,19 and 20) maybe its some of them ?
You may have an 'extended temperature' device in which case you will need to provide a negative voltage for pin 3.
Yea ok i'll try that.
Btw can i see the chip if i remove the black dot on the print ?
If you measured 0v at pin 3 with the display working in its original panel then this means that this is probably not an extended temperature device, so that is one less problem to deal with.
We still do not know for sure that this device is compatible with the HD44780. The only mention that I found was in the forum that you linked to in your original post but we don't know if that is correct or not.
Have you been able to get the row(s) of blocks when you connect just the power, contrast and backlight (pins 1, 2, 3, 15, and 16 as I mentioned in reply #1. That is what you should get if the controller is compatible with the HD44780 and you do not initialize it.
I tried too set it up with pin 3 to GND and have not any blocks as you mention..
But what could it be completible with ?
when i get to work to night ill try to put 5vdc and gnd on the last 2 pins (pin 19 and 20)
and maybe 5vdc on pin 17-18 (like the panel had it) too see if i can get it too work.
is it true that the Volts will jump up and down on the data pins ? (D1-D8)
bc the on pins 17,18,19 the volts where stabil at 5,1vdc while the text was changing..
Should i trough it away and buy one that i know is HD44780 ?
