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LCD Backpack (i2c) for Raspberry Pi now?
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LCD Backpack (i2c) for Raspberry Pi now?

by tikka308 on Sat Nov 24, 2012 1:00 pm

Does this new Pi plate / tutorial http://learn.adafruit.com/category/raspberry-pi mean that an Adafruit LCD Backpack (https://www.adafruit.com/products/292) can be used to control an LCD on an raspberry pi?

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Re: LCD Backpack (i2c) for Raspberry Pi now?

by adafruit_support_bill on Sat Nov 24, 2012 2:40 pm

The tutorial is for a new product http: //www.adafruit.com/products/1110
That includes pushbutton control as well as the LCD. The backpack can be used with the Pi as well, but lacks the pushbuttons and the RGB backlight control.

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Re: LCD Backpack (i2c) for Raspberry Pi now?

by tikka308 on Sat Nov 24, 2012 2:50 pm

Adafruit - Thanks for the quick reply. Yes, I understand the http: //www.adafruit.com/products/1110 is a new and different product than the LCD Backpack.

I have been longing for a way to control an LCD on my Pi via i2c (instead of the manual way, as shown http://learn.adafruit.com/drive-a-16x2- ... spberry-pi). Since this new tutorial for the Pi Plate (http://learn.adafruit.com/adafruit-16x2 ... spberry-pi) is an example of LCD control via I2C, I was hoping that meant the backpack could work! I hooked up the LCD backpack up to the SDA and SCL pins on the Pi and ran the Adafruit_CharLCDPlate.py sketch but got nothing.

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Re: LCD Backpack (i2c) for Raspberry Pi now?

by adafruit_support_bill on Sun Nov 25, 2012 12:00 pm

The backpack has pullups to 5v on SCL/SDA. I believe you would need a level shifter, or remove the pullups from the backpack and add 3.3v pullups on the Pi side.

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Re: LCD Backpack (i2c) for Raspberry Pi now?

by adafruit on Sun Nov 25, 2012 1:21 pm

please note the deigns is similar but the code we have will NOT work for the i2c backpack , its ONLY for the RGB plate! The code will have to be adapted to support the backpack- no ETA as to when we can get to it.

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