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Arduino uno can't used without external Sheild. In this tutorial we can chared how to make out Sheid For arduino using 4 pcs LED.

Step 1: Schematic Sheild LED Output for Arduino

This schematic explain how it conectod to pin digital out arduino uno R3. we soldered this on universal PCB.

Step 2: Finally

this simple LED out sheild for arduino UNO R3.

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