Uploading the Blink Sketch to your Arduino board allows you to verify that your Arduino Board is connected to your computer, and that your configurations are right.
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Arduino Modules – Real Time Clock Setup (DS3231)
A Real Time Clock module gives the ability for an Arduino to keep track of the current time, and be able to track time even when the device loses power. Many libraries for Clock Modules […]

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Types of Arduino Boards
There are numerous type of Arduino Boards. You basically code for them the same way, but different boards offer different options such as more Digital Connections, or WiFi.
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