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arduino - How do I hook up an LED across the tx pin on my Atmega328? - Electrical Engineering Stack Exchange
arduino - How do I hook up an LED across the tx pin on my Atmega328? - Electrical Engineering Stack Exchange
SOLVED] - OpAmp driven RX/TX activity LED for UART. | Forum for Electronics
TX / RX Activity Light Circuit — Parallax Forums
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arduino - How do I hook up an LED across the tx pin on my Atmega328? - Electrical Engineering Stack Exchange
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communication - RX/TX LED for MAX232 - Electrical Engineering Stack Exchange
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