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2.8" Adafruit 335 touchscreen has no picture.
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2.8" Adafruit 335 touchscreen has no picture.

by eljainc on Fri Nov 16, 2012 4:06 pm

I have connected to an Arduino Mega Pro to and AdaFruit 335 2.8" touchscreen module.

I have the I/O lines (8 of them) connected properly as well as the X+/X- and
Y+/Y- touch signal lines. I have +5V powered to Vcc and GND to GND.

Are there any other lines or voltages needed? Backlight voltages? I'm not getting any picture
on the 335 touchscreen when I power it on and start up my Arduino sketch.

Thanks
Mike
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Re: 2.8" Adafruit 335 touchscreen has no picture.

by adafruit on Fri Nov 16, 2012 9:39 pm

Try using a genuine Arduino UNO or Mega - there could be a difference with the "Pro"!

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Re: 2.8" Adafruit 335 touchscreen has no picture.

by pburgess on Sat Nov 17, 2012 1:25 am

Couple ideas:

1) Are the data lines connected to pins 22-29 on the Mega? It's mentioned in the tutorial, but not shown visually; the normal Uno wiring doesn't work with the Mega.

2) What driver chip ID is the software reporting in the serial console?

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Re: 2.8" Adafruit 335 touchscreen has no picture.

by Arctic_Eddie on Mon Nov 19, 2012 10:03 am

The OP did not mention the control lines. Maybe they're not connected or defined properly in the sketch. I have the same display running on a Mega with the data lines, D0-D7, connected to D22-D29 respectively and the control lines connected at D40-D44. The touch lines use A8-A11. Everything works fine.
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Re: 2.8" Adafruit 335 touchscreen has no picture.

by eljainc on Mon Nov 19, 2012 2:50 pm

Is there supposed to be a splash screen if I just power it with +5V and GND at the PWR block?

I am quite sure the signal lines for control and touch are properly connected, but I will countercheck.
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Re: 2.8" Adafruit 335 touchscreen has no picture.

by eljainc on Mon Nov 19, 2012 4:18 pm

pburgess wrote:Couple ideas:

1) Are the data lines connected to pins 22-29 on the Mega? It's mentioned in the tutorial, but not shown visually; the normal Uno wiring doesn't work with the Mega.

2) What driver chip ID is the software reporting in the serial console?



The data lines are connected to 22-29 on the Mega pro. The serial console is showing
Unknown Driver Chip FEFE. Does this sound right? How can I query for the driver Chip ID?
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Re: 2.8" Adafruit 335 touchscreen has no picture.

by eljainc on Mon Nov 19, 2012 5:06 pm

I think I found the problem. Our original wiring diagrams did not show that the Backlight (BACKLITE) to be connected to anything. So we were getting a black/blank screen. I should have an answer soon.
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