TFT 5.0 with RA8875

Our weekly LIVE video chat. Every Wednesday at 8pm ET!

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
User avatar
Hussam
 
Posts: 9
Joined: Sat Jun 13, 2015 10:36 am

TFT 5.0 with RA8875

Post by Hussam »

Hi all,
this topic about has two sections
first section:
I recently bought TFT 5.0 touch screen with RA8875 breakout to connect the tft with arduino, but when I try to calibrate the touch screen the points of calibration keep changing. i.e. when the first piont is pressed the second is pressed by itself and move to the third one which yield to inaccurate reading for the touch coordinate
so is the touchpad has some issues ? or did I do something wrong ?
Second section
This section about RA8875 itself.
what is the minummum voltage for the Vin of this chip ? should I use 5V volt exactly or more to obtain better result?

Regards

User avatar
adafruit_support_rick
 
Posts: 35092
Joined: Tue Mar 15, 2011 11:42 am

Re: TFT 5.0 with RA8875

Post by adafruit_support_rick »

What are you using for a touch controller?

Run the RA8875 on 5V only.

User avatar
Hussam
 
Posts: 9
Joined: Sat Jun 13, 2015 10:36 am

Re: TFT 5.0 with RA8875

Post by Hussam »

adafruit_support_rick wrote:What are you using for a touch controller?

Run the RA8875 on 5V only.
thank you for your reply
I am currently trying to calibrate the touch screen because when I am trying any example which including touch function I noticed that thouch is not accurate
for example when using test example from the librery the touch circls repeat themself inaccurately.
if you want me to uplaod a video showing whats going on I don't have any problem

User avatar
adafruit_support_rick
 
Posts: 35092
Joined: Tue Mar 15, 2011 11:42 am

Re: TFT 5.0 with RA8875

Post by adafruit_support_rick »

Yes, a video would be good. Thanks!

User avatar
Hussam
 
Posts: 9
Joined: Sat Jun 13, 2015 10:36 am

Re: TFT 5.0 with RA8875

Post by Hussam »

adafruit_support_rick wrote:Yes, a video would be good. Thanks!
thank you for your reply
here is the link for my video
https://drive.google.com/file/d/0B3pv8E ... sp=sharing
I prefer to download it

User avatar
adafruit_support_rick
 
Posts: 35092
Joined: Tue Mar 15, 2011 11:42 am

Re: TFT 5.0 with RA8875

Post by adafruit_support_rick »

That's weird. Let's try replacing the screen.

Please email [email protected] with a link to this thread for a replacement TFT

Locked
Please be positive and constructive with your questions and comments.

Return to “Ask an Engineer! VIDEO CHAT (closed)”