5 different ways to Blink an LED using Arduino (+ Bonus)
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adding LED's to Rx/Tx lines of 328 TFQP SMD to show uploading action - General Electronics - Arduino Forum
Computer doesn't recognize Arduino (PWR/L/TX/RX indicator lights are all on) - Project Guidance - Arduino Forum
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L1: Turning on an LED - Physical Computing
LEDs | Ladyada's Learn Arduino - Lesson #0 | Adafruit Learning System
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