2.2 TFT Serial with ILI9225 - driver needed

Other Hardware Displays
1

Hello,
I'm struggling around with following device:

I tried out many libraries, even utft doesn't work. (Driver must be in serial mode, tried out every one in the source code)
Voltage isn´t a problem because this device has an onboard converter for all pins.

Pin description is easy:
11PIN Standard wiring used IO:

  1. VCC—Power supply (5V/3.3V)
  2. GND-- Power supply (GND)
  3. GND-- Power supply (GND)
  4. NC—No connect
  5. NC—No connect
  6. LED-- Pick IO control back light off or PWM brightness control
  7. CLK—SPI clock signal
  8. SDI—Serial data input pin sda
  9. RS—Command (RS=0)/ Parameter (RS=1)
  10. RST—Reset pin
  11. CS-- Chip selection pin

I can connect it (as shown on the product foto) directly to VCC,GND,A0-A5
A0 is only for the brightness.
Unfortunately there is no easy research for that display ( in serial mode)
I tried to contact the (friendly) seller, he only send me the same description for the display as on the product page (but in chinese :slight_smile: )
Does anybody has a working code for this display or some hints?

Thank you
Matthias

2

SUCCEED!
Using following library works like a charme with my display:

Using the first example sketch!

3

Because I was asked by PM, some hints:

Hello,
I dont know if I've modified my library, so I'll tell you the way how to find the pin mapping:
For some reasons they are hardcoded in the screen_4D_22_library.h file.
So my *.h file says:
#define _4DSHIELD22_LCD_RESET A0 // Arduino Pin A0
#define _4DSHIELD22_LCD_RS 8 // Arduino Pin 8 - data or command
#define _4DSHIELD22_LCD_CS 7 // Arduino Pin 7 - select
#define _4DSHIELD22_LCD_Backlight 9 // Arduino Pin 9

#define _4DSHIELD22_TOUCH_YU A3 // Arduino Pin A3 - analog
#define _4DSHIELD22_TOUCH_XR A4 // Arduino Pin A4 - analog
#define _4DSHIELD22_TOUCH_YD A1 // Arduino Pin A1 - analog or digital
#define _4DSHIELD22_TOUCH_XL A2 // Arduino Pin A2 - analog or digital

The last 4 lines you can forget for the moment, because our display has no touch screen.
So the configuration should be:
(left: display, right UNO)
CLK <—> SPI clock signal D13 (SCK)
SDI <—> Serial data input pin sda D11 (MOSI)
RS <—> D8 (Data/Command)
CS <—> D7 (chip select (SPI command))
LCD <—> D9 (Display backlight on/off, can be wired directly to 5v (better with 100R resistor!)
RST <—> A0 (Reset)

The library itself is a little bit overloaded in my opinion and hard to comprehensible.
I found another library, but didn't tested it out:

Regards
Matthias

4

hi,

thank you for your post. Now it is working. But i have another question, how can i print data (reading form temp sensor) to the screen? I couldnt find the code comand for that.

Thank you again

Marko

5

Hello,
you need to convert the byte/integer as a string

Here is an example:
int tempsensordata =analogRead(A1);
String outputscreen = String(tempsensordata);

myScreen.text(10, 10, outputscreen);

6

Hello
thank you again. Works great, but i would like to ask you one more question. I have DHT22 sensor, and the reading i got are float , not integer. I did correcet my code to integer and it works. But pleas tell me how to get float numbers to the display?

void loop() {

int h = dht.readHumidity(); //i changed float to int!!!!
int t = dht.readTemperature(); //i changed float to int!!!!

int temp = t;
String temperature = String (t);

int humidy = h;
String humidity = String (h);

myScreen.rectangle(0, 0, myScreen.maxX()-1, myScreen.maxY()-1, whiteColour);
myScreen.text(10, 10, "Temperatura=", whiteColour, 0, 1.5);

myScreen.text (85, 10, temperature);

myScreen.text (85, 20, humidity);

Thank you

7

I'm a little bit sleepy, so excuse my answer: :slight_smile:
http://lmgtfy.com/?q=arduino+float+to+string

8

Hi. Do you have a working exemple to use this library?

It would be greatly appreciated.

thank you!
Marc. >: :slight_smile: