Refers to pull-up resistors, which are commonly used to "weakly" pull a signal line to a high state. Use this tag for discussing pull-ups.
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Reading digital port with pullup via Firmata
I've got a weird issue, probably something I'm missing but have no clue what.
Got some simple float sensors connected to D2 - D5 on a Nano. Need internal pull-up to eliminate a floating value. Wrote ...
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1answer
56 views
Shift Register w/ Internal Pullups?
Is there a chip that is just a parallel in / serial out shift register but with integrated internal pullups?
I could use a full-blown I/O expander but I really just need more momentary button inputs. ...
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2answers
31 views
Digital Pin State - Some 1, Some 0
I'm running a sketch that looks for inputs to digital pins 3, 4, 5, 6, and 7. The gist of the sketch is that it's a digitalRead() from 3-7 with a Serial.println() to the monitor. The odd thing is ...
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93 views
Second I2C address not accepted
I have set up 2 DHT22 sensors and 2 BMP280 sensors with an Arduino Uno SMD R3 board. The DHTs are working fine and are outputting correct temperature and humidity values to the Serial monitor. The ...
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116 views
ATtiny85 and INPUT_PULLUP
I have read some conflicting sources about what pins have internal pullup resistors available for the Attiny85 microcontroller. Can all I/O pins work with INPUT_PULLUP, or just some of them? And if so,...
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275 views
ArduinoMEGA: 64 digital inputs cause random digitalRead values
I have 64 hall effect sensors (magnetic field sensors) (DRV5023AJQLPG) connected to an Arduino MEGA 2560. For that, I use 48 digital pins and 16 analog pins as digital input pins. The program in the ...
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2answers
191 views
Relay module and internal pull-up resistors
I'm currently assembling a prototype of the lightning infrastructure (based on several MEGAs interconnected via RS485, as described in this other post)
The prototype consists of three MEGAs, a ...
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1answer
136 views
Use TSL2561 and DS1307 RTC together
I want to use a TSL2561 light sensor and a DS1307 RTC and a couple of other sensors like DS18B20, AS3935, ML8511, MQ135, 433 mhz sender together with an Arduino.
However on Adafruit I read this today (...
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2answers
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Disabling i2c internal pull up resistors
How do you do this? I've been digging around and I can see that I should do this and supply my own external pull up resistors but I don't know exactly how to disable them. The pages I've been reading ...
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1answer
209 views
Using an Arduino as an LED controller for an arcade stick
I'm attempting what seemed to be a rather simple problem at first glance, but due to my limited knowledge of Arduino workings I need some help. I'm trying to use button outputs from a PS360+ arcade ...
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4answers
330 views
Testing tri-state pin - erroneous results with internal pullup
I'm using an MPC73831 - a LiPo charging IC - in my Arduino project. It has a status pin to allow interface to a microcontroller, which uses a tri-state operation to convey three possible states of ...
