sainsmart 7" touch screen+arduino mega 2560 touch is working weirdly

Using Arduino Displays
1

hello everyone..i have brought 7" touch tft+arduino mega 2560+arduino tft shild from ebay .
http://www.ebay.com/itm/SainSmart-Mega2560-7-7-Inch-TFT-LCD-Shield-TFT-LCD-Shield-For-Arduino-/121293273958?talgo=origal&tfrom=351054640826&tpos=unknow&ttype=price&ssPageName=STRK:MESE:IT.

my glcd works properly but my problem is that my touch works very weird..when i touch somewhere it will do function of somewhere else. i am using standard UTFT,UTOUCH AND UTFT_BUTTON Library. I've calibrate touch with UTOUCH calibration example but nothing change much...please help me out.

thanks in advance.

2

What Arduino IDE version are you using?

3

arduino 1.6.5

4

Try 1.5.6 or 1.0.6

5

did that work? Im having the same problem. Got a 5 inch version and its displaying correctly but the touch is all screwed up. seems upside down and inverted and also only registering a quarter of the board.?

cheers.

6

Change to one of those IDEs and try to calibrate the screen.

7

I've fix the problem now..first i've changed to arduino sketch version1.0.6. then as mention in utft.pdf i have calibrated touch screen with external power supply. after that i have to put very much pressure for require value of touch otherwise it shows random value. then i've add delay line after myTouch.datadataAvailable(); like below..

from
if (myTouch.dataAvailable())
{
myTouch.read();
x=myTouch.getX();
y=myTouch.getY();
.
.
.

to,

if (myTouch.dataAvailable())
{
delay(20);
myTouch.read();
x=myTouch.getX();
y=myTouch.getY();

.
.
.
then it works perfect..

8

You can set touch precision with the line "myTouch.setPrecision(PREC_LOW);"
Your options are PREC_LOW, PREC_MEDIUM, PREC_HI and PREC_EXTREME.

9

:slight_smile: