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Same pin as output and input - Electrical Engineering Stack Exchange
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IC power-supply pin - Wikipedia
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Arduino Uno Pinout | Arduino FAQs
![The Full Arduino Uno Pinout Guide [including diagram]](https://images.prismic.io/circuito/0f83e727bd5b62cfcfbaea10eb1de83ffb3af5ba_arduino-uno-pinout-power-supply.png?auto=compress,format "The Full Arduino Uno Pinout Guide [including diagram]")
The Full Arduino Uno Pinout Guide [including diagram]
What is an open drain on a FET device and how is it used?
I/O Ports and Devices | Understanding I/O Ports | Pearson IT Certification
![tutorial] Lesson 1: Inputs and Outputs | Blog - Codebender Arduino IDE](https://blog.codebender.cc/wp-content/uploads/2014/03/intro__zps2d47d1b6.png "tutorial] Lesson 1: Inputs and Outputs | Blog - Codebender Arduino IDE")
tutorial] Lesson 1: Inputs and Outputs | Blog - Codebender Arduino IDE
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What does "open drain" mean? - FAQs - Engineering and Component Solution Forum - TechForum │ Digi-Key
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General Purpose Input/Output (GPIO)
What Are GPIO Pins Or General Purpose Input Output? - SwitchDoc Labs Blog
ESP32 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
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General Purpose Input / Output (GPIO)
Input Interfacing Circuits Connect to the Real World
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The Basics of Arduino: Reading Switch States
Selecting Appropriate Input and Output Plugs for Your Power Adapter | CUI Inc
