Blog Arşivleri

Shield Design for Arduino Mega 2560 R3

As you noticed my 3.2″ TFT screen has 40 terminal pin and almost all of them will be used.
It is not an plug-in and use screen. So i have desing and shield for my LCD . Be aware to enlarge
other pins. Because after our shield design unused pins must not be under the shield as discarded (inert).

Another important point is; Arduino’s output high level is 5v but screens high input is 3.3V.
(I mentioned about that before). I used 330 ohms resistor and 1K ohms in series as a voltage divider.

PCB Design

3D

My design can be shown from photos.

3.2″ TFT LCD (new)

In my this writing i will introduce my new TFT LCD display.

Front Side

Front Side

Rear side

I bought that screen because my previous screen was not good enough. It couldn’t run all UFTF library and technical support was not sufficient. So i ordered new one from ebay, sellers name is electronics_lee . It is 3.2″ touch screen (1)

first of all i only connected TFT connections without SD card and TOUCH screen pins.
My connections are same as at “UTFT_Requirements” files in page 2 and 4. (2)

Then i faced different problems at the screen. Some random lines/strip occur aat the screen while a process happening in the screen. If you have same problem i highly recommed  to power of the screen because this lines are occur because of high voltage.

Without voltage divider resistor - while screen output is changing

Without voltage divider resistor – while screen output is changing

Without voltage divider resistor - while screen output is constant

Without voltage divider resistor – while screen output is constant

Arduino’s output high level is 5 volts and screen’s high volt is 3.3 volt but tolerated to 5 volts. I used 330 ohms and 1K ohms resisters as a voltage divider for all outputs of arduino. Divided (reduced) voltage goes to the screen.  After this correnction , screen works fine.

After arduino's output is reduced to 3.3 volts by using resistors.

After arduino’s output is reduced to 3.3 volts by using resistors.

(1) 3.2″inch TFT LCD Display module + touch panel & SD card cage for Arduinohttp://www.ebay.com/itm/3-2-inch-TFT-LCD-Display-module-touch-panel-SD-card-cage-Arduino-/271201097446?pt=LH_DefaultDomain_0&hash=item3f24d856e6

(2) Download “UTFT.rar” http://henningkarlsen.com/electronics/library.php?id=51

Yeni proje

Arduino ile quarotor yapımında epey yol aldıktan sonra teknik aksaklıklar ve kısıtlı zaman olması sebebiyle projeyi bitirdik. Proje bize çok güzel tecrübe oldu. Lisans döneminde okulun bşze vermeyeceği bilgileri kendi çabalarımızla tecrübe ettik. Şimdi ise son sene yaklaştığı için bitirme projesine yoğunlaşamamız lazım. Aklımıza bir iki fikir geliyor. Önce malzeme sparişi verelim ortaya çıkan ürünleri paylaşırız.