newbie question

[doug]

I just bought an LCD, and when when I hooked it up, the backlight comes on when only logic power is applied. When the backlight power is on, it does nothing. Also, I cant get it to display any text. I checked a zillion times on the wiring, nothing is wrong. Any suggestions? Thanks.

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[CF Tech]

Couple of questions:

1) What is the part number?

2) What microcontroller are you using (PIC, AVR, MSP430, 'HC11 etc.)?

3) What is your favorite color?

 

[doug]

the part number is EW162C1YMY
the microcontroller is an ATmega16
my favorite color is blue

one other thing... i disconnected everything but pins 1 and 2 on the LCD (power and ground) and the backlight still comes on. I apply power to pins 15 and 16 and the backlight does not come on.

 

[CF Tech]

You will want to search for a data sheet for that display.

Good call on the ATmega16.

Sometimes the manufacturer will add some dropping resistors and connect the backlight to pins 1 & 2 to reduce the total number of connection.

These displays will typically not show anything until they are initialized. You can look in CFAH_WinTest for an example.