i2c / SPI character LCD backpack not workin

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tikishark
 
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Joined: Sat Jan 04, 2014 2:23 pm

i2c / SPI character LCD backpack not workin

Post by tikishark »

I purchased an i2c / SPC character LCD backpack which I assembled this weekend. After soldering everything together, I placed my LCD on the backpack, screwed in 4 jumper wires and uploaded the HelloWorld iC2 sketch from Ada's github library (including the updated Adafruit LiquidCrystal library). When I ran the sketch, nothing happened on the LCD. I see a row of completely shaded boxes, but no text. I know the LCD works as I've connected it on a breadboard with all the pins, and everything works well. I also tried moving the contrast screw that is on the backpack, but that didn't change anything. If I hold the LCD at an angle I can see a few garbled characters flashing on and off (occasionally). I've attached a picture of both the front and back of the backpack for you to inspect.

Thanks for the help....

John
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1chicagodave
 
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Re: i2c / SPI character LCD backpack not workin

Post by 1chicagodave »

I think you may have it connected backwards. The side with screw terminals should be by pin 1 of LCD.

See photo -
image.jpg
image.jpg (72.63 KiB) Viewed 247 times
http://www.adafruit.com/products/292

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tikishark
 
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Re: i2c / SPI character LCD backpack not workin

Post by tikishark »

1chicagodave wrote:I think you may have it connected backwards. The side with screw terminals should be by pin 1 of LCD.

See photo -
image.jpg
http://www.adafruit.com/products/292

I got it working off of your suggestion. The top row of my LCD was broken off from a previous experiment, so I had to use the bottom strip. I was overthinking the solution and placed female headers on the backpack trying to be clever. I actually had everything backwards. I just had to reverse everything to get it working.

Thanks for the help...

1chicagodave
 
Posts: 564
Joined: Wed Jun 19, 2013 3:35 am

Re: i2c / SPI character LCD backpack not workin

Post by 1chicagodave »

Great! Glad it's working.
I was overthinking the solution...
I think we've all been there a few times. :)

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