Interfacing Arduino with ILI9341 color TFT display

Projects General Guidance
1

Hi, newbie here. so i want to ask,

Schematic_1
Schematic_11920×1080 193 KB

  1. So the ILI9341 is 3.3v and arduino 5v. In the schematic, why he connect the vcc to the 5v? shouldn't he connect to 3.3v instead?
  2. what if i connect the vcc to 3.3v, then proceed to connect other pins without the resistor
2

Please post a link to its datasheet.

3

https://www.digikey.com/htmldatasheets/production/1640716/0/0/1/ili9341-datasheet.html

this is the link

4

It says:
LCD Voltage drive:
 Source/VCOM power supply voltage
 AVDD - GND = 4.5V ~ 5.5V
 VCL - GND = -2.0V ~ -3.0V

5

im sorry, but im not quite understand. meaning that the lcd must be connect to 5v in arduino?

6

Yes, but to that pin, AVDD. The LCD obviously need 5 V. The logic signals are 3.3 volt. It should not be directly connected to 5 V controllers like UNO etc. Level shifting is needed.

7

Logic level shifter
Logic level shifter920×571 63.1 KB

so, the lcd power is 5V. however the only the pin voltage is 3.3v. using this logic level converter is sufficient right? just connect the arduino 5v directly to the lcd vc, and the other pin to this shifter

8

Looks good.

9

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