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.
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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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