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LCD interfacing

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darsh

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I bought an 16x2 lcd - JHD126A but i m having problems interfacing it with Atmega32. i m using it in 4 bit mode. is this and hd47780 are compatible lcd's ? also does the header file lcd.h which comes with winavr adaptable with this lcd? right now i can only see black squares on my first line of lcd screen. is there any code available ot tutorial available so that i can directly implement the functions like "lcdputs()" etc..
thanks
 

ericgibbs

Well-Known Member
Most Helpful Member
I bought an 16x2 lcd - JHD126A but i m having problems interfacing it with Atmega32. i m using it in 4 bit mode. is this and hd47780 are compatible lcd's ? also does the header file lcd.h which comes with winavr adaptable with this lcd? right now i can only see black squares on my first line of lcd screen. is there any code available ot tutorial available so that i can directly implement the functions like "lcdputs()" etc..
thanks
hi,
Have you checked the avrfreaks site.?:)
Do have a 'contrast pot' on the LCD.??

View topic - Help : LCD interfacing with ATmega32 :: AVR Freaks

Connect LCD to Atmega using 3 wires - Scientific, embedded, biomedical, electronics contents.
 

mvs sarma

Well-Known Member
I bought an 16x2 lcd - JHD126A but i m having problems interfacing it with Atmega32. i m using it in 4 bit mode. is this and hd47780 are compatible lcd's ? also does the header file lcd.h which comes with winavr adaptable with this lcd? right now i can only see black squares on my first line of lcd screen. is there any code available ot tutorial available so that i can directly implement the functions like "lcdputs()" etc..
thanks
Darsh, it is JHD162A.
it is compatible with the standard hd47780 LCD displays. It can be used for 4 bit mode even with ATMega32

please adjust the Contrast pot for a better visibility. the best for this mode appeared to be a voltage of approximately 0.6 to 0.9 V on contrast pin.
please see the link below
http://www.electro-tech-online.com/threads/atmega32-and-hd44780-lcd-driver.85774/
 

darsh

New Member
i m using a potentiometer for the contrast pin and the display works well.
but i need it to use in 4bit mode.
 
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