HACKING CHEAP SMARTWATCHES (9BIT SPI LCD)

HELLO GUYS THIS IS MY FIRST INSTRUCTABLES HOPE YOU GUYS LIKE IT. IN THIS PROJECT I AM GOING TO HACK A CHEAP SMARTWATCH AND USE ITS LCD TO DRIVE THROUGH ARDUINO.

AS THIS LCD HAS ONLY 3WIRE SPI INTERFACE SO, WE HAVE TO USE SOFTWARE SPI (9BIT SPI).

I GET THE ORIGINAL ADAFRUIT LIABRARY AND TWEAKED IT A LITTLE BIT TO USE IT WITH 9BIT SPI LCD.

LATER ON I WILL USE IT FOR MY HOMEMADE RADIO CONTROLLER USING NRF24L01+ MODULE AND ARDUINO. WILL SHERE IT WITH YOU GUYS SOON......

first of all we have to know pinouts of this lcd that we have found in cheap smartwatch (dz09). as i have searches a lot on internet and finally found the lcd on aliexpress. (IPS 1.54 inch 24P SPI 262K COG TFT LCD Screen with Connector ST7789V Drive IC 240*240|LCD Modules| - AliExpress). here is the pinout.

we have to use

SDA

SCL

CS

RESET

LEDK

LEDA

GND

IOVCC

IN THIS STEP WE HAVE TO WIRE UP THE LCD TO MAKE IT EASY TO CONNECT

HERE WE WILL CONNECT

IOVCC -------- +3.3V

LEDA --------- +3.3V

GND -------- GND

LEDK -------- GND

SDA ------- SERIAL DATA

SCL ------- SERIAL CLOCK

CE -------- CHIP ENABLE (OR CONNECT IT TO GROUND)

RST -------- RESET

SO, FINALLY WE HAVE 6 WIRES, AND AFTER CONNECTING CE TO GND WE HAVE 5 WIRES.

NOW, WE WILL CONNECT IT TO ARDUINO

IOVCC+LEDA ------------ +3.3V

GND+LEDK -------------- GND

SDA(MOSI) ----------- D3

SCL ----------- D4

RST ---------- D5

AFTER WIRING UP THE LCD WE NEED LIBRARY FOR DRIVING IT. HERE I HAVE TWEAKED THE ORIGINAL ADAFRUIT LIABRARY FOR DRIVING 9 BIT SPI LCD MODULE. YOU CAN DOWNLOAD IT HERE

https://drive.google.com/file/d/1M4GnCJ67WUDDl8M0L...

AFTER DOWNLOADING IT INSTALL IN ARDUINO IDE AND OPEN EXAMPLE --- TFT_LCD_FULL_CHECKUP

HERE WE HAVE ASSIGNES OUR PINS FOR CONNECTING LCD WITH ARDUINO. YOU CAN CONNECT AS PER THE CODE OR YOU CAN CHANGE THE PINS. AS WE ARE USING SOFTWARE SPI COMMUNICATION IT IS A BIT SLOW BUT HEY WE SALVEGED THE LCD FROM A CHEAP SMARTWATCH.

UPLOAD THE COAD AND SEE THE MAGIC. THE LCD WILL GO THROUGH A FULL LCD CHECKUP AND GRAPHICS TEST.