i2c LCD display

$WMc%

Hello All:
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Has anyone tried the i2c LCD displays? Or have a spec. sheet for them?
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I have tried every i2c/SPI set up that I can think of and not a single pixel?
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The unit I have has
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GND 'ground
VCC 'power
SDA 'data
SCL 'clock
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The display has a part# J204A on the back, (Main LCD Board) And hosts a chip,(small standoff board) with these numbers PCF8574T , T65941, ktM98483, Thailand
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Thanks in advance for any help with this!!!

Hal Albach

This web page should give you a little insight ;
http://electronics.stackexchange.com/questions/101721/controlling-an-lcd-device-using-serial-i2c-module

You will have to determine how the PCF8574T ( which is an I2C Port expander ) is connected to the display. Then you are going to have to bit-bang the display commands in 4-bit mode.

Google J204A and you may find additional information.

Hal

$WMc%

Hal Albach wrote: »

This web page should give you a little insight ;
http://electronics.stackexchange.com/questions/101721/controlling-an-lcd-device-using-serial-i2c-module

You will have to determine how the PCF8574T ( which is an I2C Port expander ) is connected to the display. Then you are going to have to bit-bang the display commands in 4-bit mode.

Google J204A and you may find additional information.

Hal

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Thanks Hal Albach...The site looks promising.
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It's way beyond this thread to explain how Google works when you have searched and searched.

erco

More discussion on cheap I2C display adapters at http://forums.parallax.com/showthread.php/153857-I2C-controller-for-HD44780-LCD-displays

JonnyMac

I wrote the attached object some time ago -- works with an I2C LCD I picked up from Amazon.

$WMc%

JonnyMac wrote: »

I wrote the attached object some time ago -- works with an I2C LCD I picked up from Amazon.

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Many thanks JonnyMac
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That's were I got mine from. $8.00 4x20