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Modifying Arduino Mega 2560 R3 to work with 2.8" TFT touch s
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Modifying Arduino Mega 2560 R3 to work with 2.8" TFT touch s

by jcoon on Sun May 30, 2021 10:52 am

Hi all,

I needs some help getting the touch shield to work with my arduino 2560 r3. I understand that a capacitor is required to get this to work. However, the traces on the website do not seem to be the same on my board. I have attched a photo of the same area on my board. Any help is appreciated.

Thanks
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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by franklin97355 on Sun May 30, 2021 2:45 pm

Sorry to ask but what product are we talking about?

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by jcoon on Sun May 30, 2021 4:08 pm

Sorry, it was in the subject line but it was cut short. Its the 2.8" TFT Touch Shield for Arduino with Resistive Touch Screen

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by jcoon on Wed Jun 02, 2021 6:58 pm

Any help?

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by jcoon on Thu Jun 03, 2021 6:18 pm

Ok. Guess ill be returning it. Really hoped this was going to work...

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by adafruit_support_carter on Fri Jun 04, 2021 11:51 am

Where did you read that a capacitor is required? Info on using the 2.8" TFT Touch Shield with an Arduino Mega 2560 is here:
https://learn.adafruit.com/adafruit-2-8 ... -1833486-8

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by jcoon on Sat Jun 05, 2021 11:47 am

Hi I saw the mention of a capacitor here:
https://learn.adafruit.com/adafruit-shi ... uch-shield

If it is not required, that's great news! However I'm not sure why it isn't working. The backlight comes on with with the arduino but nothing else is displayed. Any suggestions?

Thanks

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by adafruit_support_carter on Sat Jun 05, 2021 12:03 pm

I think the page you linked is for an older version of the TFT Shield. You most likely have the newer version:
https://www.adafruit.com/product/1651
Look for 2.0 here:
shield_version.jpg
shield_version.jpg (92.04 KiB) Viewed 191 times


Just to make sure of the current state of things. Have you done anything with the jumper pads here?
tft_shield.jpg
tft_shield.jpg (93.44 KiB) Viewed 191 times

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by jcoon on Sat Jun 05, 2021 12:59 pm

It is a version 2.0. I have made no changes to the arduino or shield. Both are in stock configuration.

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by adafruit_support_carter on Sat Jun 05, 2021 1:27 pm

Ok, I think that's where the general issue is. The default configuration is for an UNO, where the SPI pins are on 11, 12, and 13. For the Mega, they are on the ICSP header - the little 2x3 female header right next to the jumpers. So what needs to be done is to (1) cut the traces to disconnect from 11, 12, and 13. And then (2) add solder jumpers across the other pads to connect to ICSP header pins.

These are all modification to the shield. Nothing is done to the Mega.

Cut traces here:
cut_traces.jpg
cut_traces.jpg (92.64 KiB) Viewed 182 times


Solder jumpers here:
solder_jumpers.jpg
solder_jumpers.jpg (94.27 KiB) Viewed 182 times

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Re: Modifying Arduino Mega 2560 R3 to work with 2.8" TFT tou

by jcoon on Sat Jun 05, 2021 1:57 pm

Excellent! With the jumper modification and the updated tutorial I am up and running. Thank you so much for the help!!!

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