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
2.8" Adafruit 335 touchscreen has no picture.
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Re: 2.8" Adafruit 335 touchscreen has no picture.
Try using a genuine Arduino UNO or Mega - there could be a difference with the "Pro"!
- pburgess
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Re: 2.8" Adafruit 335 touchscreen has no picture.
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?
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?
- arctic_eddie
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Re: 2.8" Adafruit 335 touchscreen has no picture.
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.
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.
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.
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.
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.
Please be positive and constructive with your questions and comments.