HELP NEEDED WITH ST7735 TFT DISPLAY

Other Hardware Displays
1

Hello Arduino friends,

I recently got myself a display, to be exact: Driver_ic: ST7735,Resolution: 128*128, Size 1,44''. (nomen_tec v2.0) Link to Product

But I can't get it to work. Someone who can help me with wiring up this display?
So i need connctions for:
GRD -
VVC -
SCL -
SDA -
RES -
DC -
CS -
BL -

(1 GND Ground
2 VCC Power 3.3 V
3 SCL Serial clock pin.
4 SDA Serial data input
5 RES LCM Reset pin
This pin is reset input signal. When the pin is low, initialization of the chip is
Executed. Keep this pin pull high during normal operation.
6 DC Data / Command Control
7 CS Chip Select
8 BLK Backlight control pin)

My equipment:
Arduino UNO and NANO

When i followed this tutorial: tutorial The screen turns white.
I've tried with the Adafruit GFX library combined with Adafruit ST7735.
But still a white screen.

So please help me with this display.

2

I don't believe the tutorial video. The blue board has a J3Y transistor for switching the backlight.

There is no AMS1117 regulator on the pcb.
So you should connect VCC to 3.3V
And use level shifters on all the 5V signals from a Nano or Uno.

The "level shifter" can be a 10k series resistor, a 4k7 + 10k potential divider, or regular level shifter integrated circuit.

Easy to construct on a breadboard.

Life is much simpler if you buy a proper 3.3V Arduino e.g. Zero, Due, Teensy3.x, ...
You don't need any level shifters at all.

David.

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