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You can charge the lithium battery via USB cable.
Test the solar battery panel：
We can connect the solar battery panel and an LED we provide together, as
shown below.
Disconnect the power, after a while, you will see the LED light up.
Project 9：1602 LCD
(1) Project Introduction
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
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