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how use pin rx tx to on off ( high low ) an relay or led - Installation & Troubleshooting - Arduino Forum
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The tx led of arduino uno is always on and the board can't be programmed(programmer not responding) - Installation & Troubleshooting - Arduino Forum
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Computer doesn't recognize Arduino (PWR/L/TX/RX indicator lights are all on) - Project Guidance - Arduino Forum
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adding LED's to Rx/Tx lines of 328 TFQP SMD to show uploading action - General Electronics - Arduino Forum
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