Dec 1, 2020 · A pull up/down resistor of a low enough value will reduce any induced voltage to something well below a logic level. Coupling can also occur on power supply rails, of course.

Feb 19, 2018 · Noise immunity - a lower value resistor will pull the pin up "harder" making it more difficult for noise induced in a long wire (see the previous point, too) from causing a false button press …

Nov 4, 2016 · The 4.7k ohm resistor is a "pull-up" resistor for the bus's data line. Why 4.7k? At 5V, the most current that can flow through the resistor is about 1mA. That's weak enough that all any other …

Nov 12, 2025 · The termination resistors look like pull-up resistors, but are selected to prevent signal reflections, which would make operation slow and unreliable. Line termination resistors, like the …

Oct 28, 2019 · There are two ways of pulling the pins in Arduino – using internal and external resistor. I wonder when I should use external resistor instead of INPUT_PULLUP.

Mar 27, 2015 · The discussion centers on the role of pull up and pull down resistors in PWM signal control for motor applications. Specifically, a lower pull down resistor is necessary to ensure …

Jan 7, 2020 · Note that while all all AVR chips offer pull-up resistors, you have to turn them on. To do that, use the command pinMode(pin, INPUT_PULLUP) to activate the pullup resistor on the pin pin

Jul 15, 2015 · I was trying to read up on i2c for a project I'm working on and I'd been seeing a lot of disabling of the internal pullup resistors for people's projects involving i2c, sorry for the ignorance

When would one would prefer to use an external pull-up resistor vs the internal: pinMode(fanPin, INPUT_PULLUP); Dredging through the forums and this site, the commonly recommended value for …

1 When reading up on how to make a circuit that turns an LED on when a button is held down, I keep finding people saying a pull up or down resistor must be involved, to avoid the flickering state of the …