DIY I2C LCD Display

The typical parallel LCD used with an Arduino (16x2 or 20x4) has 16 pins. Only 6 I/O pins are required on the Arduino, but what if you could get that down to two I/O pins, and still have those pins available for other devices? The I2C interface is on pins A4 and A5 of the Arduino UNO. These are addressable, and are therefore shareable with other I2C devices that have different addresses. Now, you can buy I2 ...

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