from machine import Pin, I2C
import ssd1306
import time

# I2C setup for ESP32
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=400000)

# OLED setup
WIDTH = 128
HEIGHT = 64
oled = ssd1306.SSD1306_I2C(WIDTH, HEIGHT, i2c)

# Easy-to-edit messages
TITLE = "ESP32 DISPLAY"
STATIC_LINE = "OLED scrolling demo"
SCROLL_MESSAGE = "Welcome to Computer Engineering!   ESP32 + OLED scrolling project   "
FOOTER = "By: Pendar"

def show_start_screen():
    oled.fill(0)
    oled.text(TITLE, 0, 0)
    oled.text(STATIC_LINE, 0, 16)
    oled.text("Loading...", 0, 32)
    oled.text(FOOTER, 0, 48)
    oled.show()
    time.sleep(2)

def scroll_text(message, y_pos=30, speed=0.03):
    text_width = len(message) * 8  # approx. 8 pixels per character

    for x in range(WIDTH, -text_width, -1):
        oled.fill(0)
        oled.text(TITLE, 0, 0)
        oled.text("Message:", 0, 16)
        oled.text(message, x, y_pos)
        oled.text(FOOTER, 0, 48)
        oled.show()
        time.sleep(speed)

def main():
    show_start_screen()
    while True:
        scroll_text(SCROLL_MESSAGE)

main()