The use of 4.7kOhm resistor with DS18B20 temperature sensor
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 …
Using an external pull-up resistor vs INPUT_PULLUP
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 …
resistor - Multiple I2C slave devices on Arduino - Pull-up values ...
In following schematic, I have used pull up resistors for both I2C devices. Considering devices might be turned on and off at different timing, or even one device might be absent, is it fine to remove the …
How many UNO pins have internal pull up resistors?
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
pull up - External vs internal pullup - Arduino Stack Exchange
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.
How do pull up/pull down resistors affect PWM signals in motor …
Mar 27, 2015 · Hi all, I am an electrical engineer and feel I should know this (embarrassing!), but I for the life of me still can't quite get this concept. I understand conceptually the idea behind a pull up or a …
Do I need a pull-up/down resistor for button LED circuit?
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 …
Resistor pull-ups for ESP8266 - Arduino Stack Exchange
Feb 19, 2018 · I'm using 4.7kOhm resistor as pullups for GPIOs 2,0,2,16, CH_PD and RESET, and also 4.7kOhm pulldown for GPIO 15. The ESP8266 boots and works fine. Would it be okay for a long …
Suggested pullup resistor values for 1-wire network
Jun 28, 2022 · For what it's worth, I presently have a single 4.7k pullup resistor sitting at point "E", and it seems to work... but after reading Maxim's AppNote about "Building reliable long 1-wire networks" …
Open drain without pull-up - Arduino Stack Exchange
Dec 11, 2024 · Of course the Arduino's pull-ups will be in parallel to the ones of the controlled computer. But because of the high resistor value, it makes no problem. Is this [open-drain mode] a good idea? …