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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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Thread Tools | Display Modes |
17th July 2007, 03:32 AM
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problem with LCD
i m using PIC16F877 to run LED and LCD Display, the LCD that i use is type CMC216x01..(www.cct.com.my)
after i burn my program code inside PIC and run it.. the LED can blink as i want, but the LCD show nothing... before that,the PIC that i program can run well on PICDEM2 PLUS(the LED and LCD can show the result).. i just move the PIC to the board that i built but it only can show the LED result but not LCD result.. the LCD pin i just connect to PIC directly using wire: pin1(Vss)=Gnd pin2(Vdd)=+5V pin3(Vo)=potentiometer pin4(RS)=RA3 pin5(R/W)=RA2 pin6(E)=RA1 pin11(DB4)=RD0 pin12(DB5)=RD1 pin13(DB6)=RD2 pin14(DB7)=RA3 |
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17th July 2007, 03:54 AM
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i think i have upload the wrong file, should be this one.. |
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17th July 2007, 03:59 AM
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Hi,
Can you assemble the program properly? Code:
cblock 0x20 ;start of general purpose registers count LCD_PORT Equ PORTD LCD_TRIS Equ TRISD LCD_CTRL Equ PORTA LCD_RS Equ 0x03 ;LCD handshake lines LCD_RW Equ 0x02 LCD_E Equ 0x01 LEADZ Equ 0x00 COUNT1 equ 20h COUNT2 equ 21h ADCON0 Equ 1Fh ;start of program ORG 0x0000 . . .
__________________
Superman returns.. 
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17th July 2007, 04:07 AM
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the result show that the LED can flash mean that the PIC is running well, just i not sure the LCD can't function is the LCD problem or source code problem? |
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17th July 2007, 04:10 AM
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The code seems okay. Are you combining from 2 source?
Maybe you can check the hardware connection. Sometimes my LCD not working because of the hardware. Besides, I don't use RW pin, I pull it down usually because I never read from LCD.
__________________
Superman returns..
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17th July 2007, 04:23 AM
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cos i use the same code.. i just use 1 source.. for the hardware, is it i just need to connect the pin direct to PIC, there is nothing special important component need to run the LCD, right? i mean like PIC need Oscillator.. |
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17th July 2007, 04:56 AM
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Just connect directly from the PIC to the LCD. I'm not sure whether this code suits your LCD or not.
BTW, did you adjust the contrast well? You will see nothing if Vo has the same potential as Vdd.
__________________
Superman returns..
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17th July 2007, 08:21 AM
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i have no idea of what method can i troubleshoot in order to solve the problem...   |
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17th July 2007, 10:38 AM
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17th July 2007, 02:20 PM
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Be careful with the supplied voltage. My friend has burned 2 LCDs by giving too much voltage to them (forgot to lower the programming voltage, 13 V
 )
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