Brian Lough | Use TX and RX as GPIO on your ESP8266 @BrianLough | Uploaded May 2019 | Updated October 2024, 6 days ago.
Ever wanted more GPIO on your ESP8266? This is one simple way to use your serial pins as GPIO. They can even be used for PWM and i2c!

Also check out Bornach's channel: youtube.com/channel/UC9yIAXcDmR2jjjAYopqwlmA

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Code:
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//GPIO 1 (TX) swap the pin to a GPIO.
pinMode(1, FUNCTION_3);
//GPIO 3 (RX) swap the pin to a GPIO.
pinMode(3, FUNCTION_3);

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