ON-THE-FLY NOTES
What Does a Pull-up Resistor Do?
A simple demonstration of how a pull-up resistor prevents unstable digital input readings.
VIDEO NOTE
Video coming soon
This note will include a short practical video explanation.WRITTEN NOTE
A digital input can produce unstable readings when it is not connected clearly to HIGH or LOW. A pull-up resistor keeps the input at a known HIGH state until a button or another component connects it to ground. In the video, show the unstable reading of a floating input, then add a pull-up resistor and demonstrate how the reading becomes predictable when the button is pressed and released.
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