from machine import Pin, I2C
import ssd

# Initialize I2C on pins 21 (SDA) and 22 (SCL)
i2c = I2C(0, scl=Pin(22), sda=Pin(21))

# Check if any I2C devices are connected
devices = i2c.scan()

if devices:  # if at least one device is found
    oled = ssd.SSD_I2C(128, 64, i2c)

    while True:
        oled.fill(0)             # clear screen
        oled.text("Hello World!", 10, 10)
        oled.show()
else:
    print("No I2C device found!")