Hi all!,
I have a 1.8" TFT, with ST7735 controller, 128x160 pixels. SPI bus. The pinout is:

TFT 1.8" wired to ESP8266
1-NC..............................NC
2-GND...........................GND
3-Led-............................GND
4-Led+...........................3.3V
5-GND...........................GND
6-Reset..........................3.3V
7-A0...............................D3
8-SDA (Mosi).................D7
9-SCK............................D5
10-VCC..........................3.3V
11-IOVCC......................NC
12-CS............................D8
13-GND.........................GND
14-NC..................

I connected to a ESP8266 and it works well.
The problem is I need more bright, but I dont have any more GPIOs free to use. I tried a switch in this way:
|
switch left = ESP8266 3.3V
switch center = LED+
switch right = ESP8266 5V

When switch is at left, LED+ is at 3.3V. When is at right, LED+ is a 5V (with a RLim to ensure dont go more than 60mA). The thing works, but I want to be sure I'm not doing something silly.
Is this correct?

Also I have a question. I noticed I can disconnect the TFT VCC pin, and the display still works normally. ¿What exactly does the TFT VCC pin?

Anyone has a better idea of how to control bright without GPIOs free?
(I have an I2C I/O Expander in the circuit, a PCF8574, with I/Os free, but it havent PWM capacity).

 

if your unit is like mine, then you have micro SD card reader. some of the pins are for using SD card and have nothing to do with operating the screen.

 

http://henrysbench.capnfatz.com/hen...t-v1-0-st7736-arduino-tutorial-1-hello-world/

 

Thank you!
Mine is the screen only, with a 14 pins connector.
https://es.aliexpress.com/store/pro...95.html?spm=a219c.12010615.0.0.21886921sEeWhS