Questions tagged [digital]
Digital refers to signals which are either on or off (high or low, one or zero). This contrasts with analog signals which have a range of values.
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Fast digital IO
I have a device programmable via an 8 bit digital parallel bus. I would like an Arduino to translate from a parallel 4 bit output of an existing device to 8 bit by intentionally reducing the ...
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How to increase pinout switching?
Consider this code:
void loop() {
digitalWrite(pinTest, HIGH);
digitalWrite(pinTest, LOW);
}
On an Arduino Mega 2560, running 16MHz (=0.06us), I would expect the width of the pulse to be ...
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Rotary encoder weird values
I am trying to understand this rotary encoder I have, but it makes no sense to me.
I am using this rotary encoder:
https://www.amazon.com/gp/product/B07DM2YMT4/
CYT1100 aka CY110 aka EC11
I am using ...
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If Arduino digital pins can be used as power supply pins then why do we need VCC pins? [closed]
If Arduino digital pins can be used as power supply pins then why do we need VCC pins?
VCC pins work the same as digital outputs , don't they? So why do we still need VCC pins to
power components
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Cannot read LED state
I am running into a problem on a very basic functionality.
I want to read the state of an LED.
I have confirmed that under the specified circumstances, the LED receives 1.9V.
I try to read its state ...
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Adjusting Threshold for Digital Pins
I am working on a project using Force Sensors to build a keyboard for MD patients.
I have connected the sensors (each with 4 input pins) to digital pins to Arduino Due.
I want to adjust the threshold ...
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HOW convert momentary button to touch sensor TTP223?
I am trying to convert
this project https://maker.pro/arduino/projects/simple-fm-radio-receiver-with-arduino-uno-and-rda5807m
to 3 touch sensors TTP223.
But so far my new code don't work.
Please can ...
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Transfer a single pulse from Tektronix function generator to Arduino UNO
I have set up a single pulse (width of ~400 ms) using the burst feature on the Tektronix AFG3102 function generator and I want to transfer this signal to the digital pin of Arduino UNO. Essentially I ...
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Arduino Micro digital output pins floating / high Z
so i recently got an arduino micro for a project needing the control of two stepper motors with the A4988 driver. previously i was prototyping on an arduino uno and everything was working fine, but on ...
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How does Arduino Servo.h library manage to output PWM when a Servo motor is connected to a non-PWM pin? [duplicate]
While learning more about Servos, the main thing i have learned is that, Servos (SG90) need PWM signal with the frequency of 50Hz. And the duty cycle of the frequency is used to rotate the angle of ...
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Digital Pins Question
I am new to the world of Arduino and need a little bit of help. I have an Arduino Uno and I am trying to supply 5V to an actuator using the digital pins. It is my understanding that the board I have ...
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Plug in analog sensor into digital pin
If I take an Arduino (samd21, if it matters) and plug in an analog sensor/pot into a digital pin and then set that pin to be an input, would digitalRead(#) trigger HIGH and LOW at some threshold point?...
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So many missed bytes with serial comm
I have a setup with serial comm from Raspberry Pi to Arduino. It's communicating at baud 9600 on both devices, and from Raspberry Pi 3b+ GPIO-14,UART0,TX0 to Arduino Nano RX0. There's a level shifter ...
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How to test custom cables?
I'm trying to make a cable checker to help me make custom cables for my computer. I'm thinking I plug the cable ends into sockets on the device, then the Arduino checks between different pins to make ...
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digitalRead() function of Arduino doesn't read Input value sent by sensor after detecting the object
I'm trying to turn ON the LED(inbuilt/PIN13) when photoelectric proximity sensor(12v) senses any object. Sensor is connected on pin 2. Assigned pin 2 as INPUT, I've got a 12v spdt relay for switching. ...
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Does setting a value always mean setting a Arduino pin?
One thing that always confused me was why we use int or other commands to set the variables to have pin numbers as if those commands were always restricted to pin numbers only. For example
int ledPin =...
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Turn on relay for amount of time by continuous input
I have a project having two input status
first the input is not continuous the output buzzer relay will be on for 10 seconds and then turned off or it can be off directly by push button
the second ...
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SoftWire Library Programming Questions for I2C with Digital Pins
I am trying to use 3 TOF10120 Laser Sensors with one Arduino that all have the same, fixed I2C Address. I don't believe it is possible to change the I2C address of the TOF10120, but if I am wrong, ...
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What’s the most stable digital communication protocol for sewable electronics? [closed]
I’ve spent the past few days trying researching communication protocols and I have a few issues. With sewable electronics, you need to work with cables with a fairly high resistance that are ...
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Unable to use analog pins as digital inputs
I want to use the analog pin A7 as a digital input pin. As stated in the Arduino docs the analog pins can be configured in the same way like any other digital pin.
However, when trying to configure an ...
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How can I add a potentiometer and more buttons to my custom game controller?
I'm new to using Arduino, and know next to nothing about programming. I'm currently trying to add a potentiometer, and possibly a few more button inputs to my 3D-printed guitar controller project
It ...
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Detecting an incoming 7.875 kHz pulse to use as trigger
I have written a code that detects an incoming pulse (square) of 7.875 kHz to trigger the output High for the entire duration of pulse, and trigger the output low if the pulse is off or not detected.
...
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Nano: All digital pins do not output anything
New user here. Using the examples provided on the Arduino IDE software I could produce melodies with a piezo buzzer, or have a blinking LED.
Not anymore. No digital pin is giving anything. I can see ...
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Is it possible to overload the digital pins for an Arduino?
I worked on an Arduino project for school that was a self-driving security robot that also acted as a smart home system.
It was essentially a self-driving Roomba-like car that included several LED's(...
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Confused as to how 2 of my interrupts are firing from just 1 pin input?
I have the following code which uses interrupts to set a flag for whether serial IO should happen to update my PC about a particular pin input. So I have interrupts on pins 2 and 3.
I am using the ...
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Is my Arduino skipping a statement?
So, I made this code (I'm rather new to this). The only thing that the Arduino should do, is when I press the button on pin 2, turn on the LED on pin 4 and emulate CTRL + R on the keyboard for the ...
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DHT11 analog or digital?
I saw some projects with DHT11, some connect it with analog pin, others connect with digital pin.
Is there any difference / advantage connecting to the analog?
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Dynamically control the output voltage of a 60V DC input
I am hoping to control a 60V DC input source dynamically using my Arduino so that the output voltage could vary between 0v to 60v. At first i was looking into digital potential meter, however I couldn'...
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Read amount of I/Os in code
I want to write an Arduino code, that runs on several different Boards. The code can perform digitalRead/Write operations, but the pin number will be set from the user/outside. I want to include a ...
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Is it possible to use the Arduino Due's specials pins for digital writing and reading?
Hello the arduino documentation on the due specifies the pin mapping of the pins.I am making a custom board using the dues schematics and i am running still a bit low on pins. Also some of the special ...
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How can I read this digital pin for Nano by using AVR's Atmel Studo?
How can I read digital pin 6 in AVR?
I set the pin as input as follows:
DDRD = B0100000; //this will set pin 6 as input
But how can I now digital read this pin?:
Another way of putting it: how can ...
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How to count positive electrical pulses?
I have a device that has one blinking LED.
I want to count the number of blinks. I planned to do it using Arduino. I will connect two terminals of LED input to Arduino digital input pins, and I will ...
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Help combining digital and analog code in arduino programming
So I'm making a device that does 3 things,
Measures frequency of an audio signal through a microphone
Checks whether there is a weight placed on a pressure pad (my pressure sensor works through the ...
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Red LED not turning off on Adafruit Circuit Playground Classic
When using the traditional Blink example program, the light blinks as expected. Even when writing from scratch digitalWriteing pin 13 to high and low repeatedly works fine. The problem is when I try ...
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`LOW` being defined as `0` and `HIGH` being defined as `1` - is this a part of external specification?
Arduino.h defines LOW as 0x0 and HIGH as 0x1. Does the Arduino API intend to expose that fact? Does it guarantee that this will always be that way?
In other words, what is the intended purpose of ...
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How can I scan for a HIGH signal on digitalRead during the main loop, while running other things?
I'm working on a program which listens for certain bytes on serial through an if/then/elseif ladder. I want to also check if a pin (say, A15) has been given a HIGH state, by another Arduino with ...
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Cannot write pin LOW
All the other examples I've seen have had coding errors where they set a pin LOW in a loop with no delay so that it goes high again right away - but this problem is different, and probably something ...
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Using a water sensor with a NodeMCU make it less sensitive?
I'm trying to digitalRead from a water sensor (the one in the picture) using NodeMCU v3,when I try the sensor with an Arduino board it works fine, but when I try it with an ESP8266 NodeMCU v3 it ...
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Can I read using an analog pin on an arduino Mega whether or not there is a high (5v) voltage on a wire from another board's digital pin?
I am making a peer-to-peer network of initiating devices and a common hub, which controls most of the hardware. It sends a number over Serial to Mega's Serial1 (Mega's Serial is used for communicating ...
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Digital I/O threshold voltages for ATmega32u4
What are the voltages on a ATmega32u4 (eg Arduino Leonardo) such that a HIGH or LOW is read?
I want to ensure that I'm reading the chip reference manual correctly, where Table 29-1 says:
VIL: Input ...
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Is my code triggering the N-Channel MOSFET as I have intended to
I have a certain bit of code that I believe after 10 seconds will send a high signal to the second digital pin for 50 seconds. After it will not do anything.
For some reason the nichrome wire is not ...
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Analog vs Digital Accelerometers - pro's and con's? [closed]
For my project i need to measure accelerations up to 16g. My options are either digital accelerometers such as the MPU6050 or MPU9250 or an analog accelerometer such as the ADXL326.
What are any ...
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How can we use two devices at the same time with arduino?
I am using fingerprint module r307 and LCD together. In that, I am using 2,3 digital pins of arduino for data transfer to the fingerprint.(I tried other pin configurations for this but it didn't work) ...
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Elapsedtime variable not resetting
I am new to Arduino programming. Let me describe the application I am working on. I am pressing a button for a certain period of time (30 sec). I can not hold it in a pressed position for all the time....
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Routing Matrix with a large number of I/O [closed]
Lets say that i would like to make a 128x128 routing matrix with an arduino uno,
Since i am unexperienced i think of using two 4051’s for 8x8 patching and because i want to persist the patch, ...
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Arduino UNO LED half brightness when connected to digital GND but not analog [closed]
I am using an Arduino UNO. When lighting an LED with the switch button on a joystick module, I have two situations:
If the LED's cathode is connected to GND on the digital pin side of the Uno, the ...
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Sending a digital signal from one Arduino to another to trigger an event
I am wanting to send a digital signal from one Arduino to another. The goal is for one Arduino send a HIGH signal to a pin on the receiving Arduino. While the pin is HIGH, do function
I initially ...
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Read frequency of input in digital pins
This is a somewhat theoretical question:
Let's say I have some sensor that sends digital signals to one of Arduino's digital ports.
Now, I don't know the frequency it sends those signals in.
For ...
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For Arduino, is there a meaningful difference between carriage returns?
Serial.write(0x0d); // hex
Serial.write(13); // ASCII
Serial.write('\r'); // char
Is one more efficient? I read how it depends on the terminal program. So does that mean the IDE? (This is my ...
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Digital Sound sensor
I am having trouble with my digital sound sensor. My goal: Clap 2 times and a led goes on. So I wrote this code. I don't know if it is correct or not. This happens: If I clap, from the serial monitor ...
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