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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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arduino - How do I hook up an LED across the tx pin on my Atmega328? - Electrical Engineering Stack Exchange
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adding LED's to Rx/Tx lines of 328 TFQP SMD to show uploading action - General Electronics - Arduino Forum
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
Usb To Rs232 Cable With Led For Rx/tx/power - Buy Usb To Rs232 Cable,Usb To Rs232 Converter Cable,Usb To Rs232 Data Cable Product on Alibaba.com
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arduino - How do I hook up an LED across the tx pin on my Atmega328? - Electrical Engineering Stack Exchange