delay(250);
tone(buzzer, 532);
delay(250);
tone(buzzer, 587);
delay(250);
tone(buzzer, 532);
delay(500);
}
Project 5: 1602 LCD Display Module
(1) Description：
With I2C communication module, this is a display module that can show 2
lines with 16 characters per line.
It shows blue background and white word and connects to I2C interface of
MCU, which highly save the MCU resources.
On the back of LCD display, there is a blue potentiometer for adjusting the
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