Questions tagged [input]

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5
votes
3answers
224 views

How do I create a 9 bit number based on values from 9 digital inputs?

I have 9 pins that are inputs from 9 IR LEDs. I want to combine all their results into one 9 bit number. example: pin1 = high, pin2 = high, pin3 = high, pin4 = low, pin5 = high, pin6 = low, pin7 = ...
5
votes
2answers
312 views

Multiple Push buttons to one input

So I am trying to use one input to control an LCD display. The goal being that once one of the buttons is pressed it delivers a message. I have watched quite a few tutorials and can get the program to ...
5
votes
1answer
2k views

Arduino Analog Input Oscillating

I'm making a simple Infrared detector using a thermopile. I have a few extra capacitors than what that schematic says. I'm currently following another, but this is the gist. Schematic and Breadboard- ...
4
votes
2answers
100 views

just a silly doubt about glowing an LED

what will happen if i insert the anode of a LED to pin 12 and cathode of the LED to pin 11 and set pin 12 to high and pin 11 to low,will the led glow??
3
votes
1answer
455 views

What is the Maximum Current an Arduino can Supply?

I was wondering how much my Arduino I/O pin can output when it is set at Output and is at High. I am using an Arduino Uno R3. Thanks in Advanced.
2
votes
2answers
21k views

Arduino: Read frequency of input from audio jack

I want to trigger an arduino from a sound from an audio jack from a mobile phone. The audio is a 1 Khz sound that the mobile will play. I want to avoid accidental triggering of the audio by testing ...
2
votes
2answers
137 views

How to wire a three-pin on-off-on switch for reading input?

I would like to read the output of an on-off-on switch with my Leonardo board, but I have very little knowledge of electronics and don't know how to wire it up. This is the switch in question: E-...
2
votes
3answers
4k views

How to detect if LED is switched on in external circuit using Arduino NANO?

I want to detect when an LED is powered on using an Arduino NANO. The LED is part of an external circuit. The LED uses about 1.8V. Would the circuit below allow me to detect when the LED is switched ...
2
votes
2answers
164 views

Port Manipulation - fastest implementation

I'm working on an Arduino program but am getting bogged down on what is the 'correct' implementation. I understand that multiple versions may work, so for my needs the 'correct' version will be the ...
2
votes
1answer
9k 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,...
2
votes
3answers
3k views

Industrializing Arduino - 24V io? (Electronics)

I would like to make an arduino board that is capable of handling 24V i/o. Powering the Arduino would be done through either a linear or switching regulator of some sort. Low amperages, so efficiency ...
2
votes
2answers
62 views

Measure the time between 2 inputs

I am making a small project, and for that, I need to measure the time between 2 inputs. basically, a program to measure the time elapsed from when digital pin 2 is high to when it again becomes high.
2
votes
1answer
6k views

Read int from Serial

with the following sketch I should be able to read and store what is entered in the Serial monitor void setup() { Serial.begin(115200); while(!Serial); } void loop() { Serial.println("Enter ...
2
votes
2answers
53 views

Rasberry Pi Controlling Arduino - Reads “Ghost” Input - Doesn't Complete Logic Loop

I am using an Arduino Atmega2560 clone, I have used it many times before with satisfactory results - although I haven't used it with my Rpi before. My Raspberry Pi is model 4 (B I think?). #define ...
2
votes
1answer
33 views

Input state is stuck HIGH when function called using input also uses same input to call another function

I'm writing a choose-your-own-adventure style project for a class project. My Arduino Uno is set up with a 16-digit LCD display and two pushbuttons with pulldown resistors. I'm wanting each function ...
2
votes
1answer
319 views

PWM Every Other Pin Doesn't Read

Scenario I've plugged 6 pins from my RC receiver into my Arduino in order to read the incoming values. Problem I'm using Digital PWM~ pins 2-6. Oddly the Arduino only reads odd channels: 1480, 0, 1175,...
2
votes
2answers
4k views

How can I tell the resistance of an internal pull-up resistor?

I have a SparkFun ESP8266 Thing Dev board, to which I want to perform a digitalRead() on one of the GPIO ports. I'm using D15, and I'm configuring it for input like this pinMode(15, INPUT_PULLUP); ...
2
votes
1answer
191 views

Reading Ground/Open signal wire combonations to power specific LED's - Can it be done?

This might be a super easy question to answer. I ordered an Arduino Uno anyways for the sole purpose to understand this. Would not mind getting a jump on things before it's here. I would like to ...
2
votes
1answer
47 views

Input clock limit

If you use an external oscillator, and divide-by-8 internally, can you apply up to 160MHz on PB6? For example, can I use my 50MHz oscillator to clock my 328p @ 6250KHz? Note: when I say oscillator I ...
2
votes
1answer
987 views

Uno as a composite USB HID keyboard

I'm looking to create a USB device that would be basically a HID keyboard. I am able to do that with Uno. I flash new firmware with a HID keyboard descriptor and on the arduino side I loop and check ...
2
votes
1answer
61 views

Analog input voltage rises when motor is working

I'm making automatic water plant system. I'm using: Arduino Uno 3.3-6V water pump -https://www.amazon.com/Vipe-Micro-Submersible-Motor-Water/dp/B01N0X3CW4 Capacitive soil moisture sensor - https://www....
2
votes
2answers
48 views

Plotting data from Arduino and using the serial monitor in parallel

I'm very new to the Arduino world so bare with me. I would like to plot live data that I receive from my arduino. I use the Serial Monitor to read user input, show text, etc. The only way I found to ...
2
votes
1answer
1k views

Creating Sine wave with DAC and feeding it back

I want to produce Digital Sine wave send it to DAC0 and then receive it back as input on A0 and plot the graph. I am using Arduino Due. I wrote the following code: #define maxSamplesNum 120 #define ...
1
vote
3answers
1k views

digitalRead keeps giving 1

I am new to arduino programming and I have bought arduino UNO a few days ago. I am trying to read the value of pin 4 using digitalRead with pinMode INPUT_PULLUP but it keeps giving me 1 even when the ...
1
vote
4answers
307 views

Why can I measure two pins simultaneously?

I would like to do an action if both buttons on my arduino pro micro are depressed simultaneously. I'm getting some strange results: // Buttons Bounce button0 = Bounce(); Bounce button1 = Bounce(); ...
1
vote
1answer
1k views

Can I use the PWM pins as regular digital input/output pins?

In regards to the arduino which has pwm pins, can I use these pins as normal input/output digital pins or not? Thanks in advance.
1
vote
3answers
2k views

does INPUT_PULLUP uses power?

When using a digital pin as input, one has the option of using the internal arduino resistor, which is connected to VCC; that is setting the digital pin as INPUT_PULLUP, and then the pin reads HIGH. ...
1
vote
1answer
107 views

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 ...
1
vote
2answers
23 views

Generate 5VDC signal when external sensor input changes from high to low

I am new to arduino. I have a project in which I need an arduino to generate a +5VDC signal in response to a change of status, (high/5VDC To low/ground) from an external source. The external ...
1
vote
1answer
644 views

Can Arduino accept HDMI input video stream, and output it without any modification to the video?

I'd like to know please whether an Arduino can accept an HDMI signal from a satellite receiver, let it flow without any modification to the stream, and output it to TV?
1
vote
1answer
750 views

4x4 matrix keypad - Multiple inputs cause extra readings

I have the following matrix keypad - I am using this as a sort of controller with my Arduino (Mega2560) but I can't get real multiple inputs to work. I am able to have say two individual keys ...
1
vote
1answer
83 views

Arduino digital I/O pins

I heard that using digital io pins in INPUT_PULLUP mode is much reliable and stable than in the case of using them in INPUT MODE.Then why is INPUT MODE still used...I mean Why isn't INPUT_PULLUP mode ...
1
vote
2answers
879 views

do digital input pins act as a positive or negative

I've gotten contradicting information on the subject. Some say that digital input pins send out positive voltage, and if it goes to ground (for example) it reads LOW but if the pin is connected to ...
1
vote
1answer
29 views

What is the name of a peripheral which reads servo output data physically?

I know the title is phrased terribly, but I'm not sure how to phrase it since I'm not sure of the name. I have a servo, that I cannot connect to, except for the output spine/shaft (physically). I ...
1
vote
1answer
42 views

Arduino Due Digital Inputs without Response

On two of my Arduino Due, when connecting the pin 3.3V to any digital inputs (37,36,35,34), no serial message nor LED_BUILTIN is thrown as output, only the Test message. Digital Pins are set as ...
1
vote
1answer
626 views

How do I choose proper diodes for a 74HC595 shift register with a wired OR connection?

I want to use a wired OR connection to connect some pins of the 74HC595 shift register to an Arduino Digital Input Pin. How do I choose proper diodes for this situation? Maximum rated forward current ...
1
vote
1answer
471 views

Compilation issues on Arduino Due

I wrote an code on Arduino and I getting compilation errors. I am using Arduino Due . I wrote the following code : void setup() { Serial.begin(9600); analogWriteResolution(12); // set the analog ...
1
vote
2answers
57 views

Make something happen on a continous input just once and for a specific amount of time

My project is very complicated, but here is a visual synthesis The input actually comes from a kinect, that detects a person position through Processing, which I connected via Serial to Arduino. ...
1
vote
1answer
768 views

Get an additional analog pin?

I have the following board: As far as I can tell, there's only a single analog pin (A0). But I need at least 2 additional (for 3 total). Is there some way to fake analog input on GPIO pins?
1
vote
1answer
707 views

Prevent 5V output on Arduino Nano 5V pin

I just made an addressable RGB LED strip controller but im concerned about if I'm going to break the thing. I know it sounds vague so let me elaborate: there is an external power supply connected to ...
1
vote
4answers
4k views

Why isn't this pushbutton program working?

Here is my circuit: and here is my code: int LED = 13; int BTN = 7; void setup() { pinMode(LED,OUTPUT); pinMode(BTN,INPUT); } void loop() { if(digitalRead(BTN) == HIGH) { digitalWrite(LED,LOW); } ...
1
vote
1answer
88 views

Can an arduino tell between being powered by USB or by the jack?

I have an arduino mega that will be communicating through serial to a pc. One of the things I want it to tell the pc is whether or not it is connected to a wall power to 12V converter (where there is ...
1
vote
2answers
2k views

Arduino nano getting powered through analog input?

I noticed something today. I am powering the Arduino Nano from a battery and a 5v step up converter. That works just fine and I'm getting a stable 5v output. I have a second cable coming out from the ...
1
vote
1answer
50 views

Is it possible to exit a loop on the change of an input state?

I would like to exit a particular loop if the state of an input changes from LOW to HIGH. This is the current loop: void brakeFade() { pixels.clear(); pixels.setBrightness(255); pixels.fill(16711680, ...
1
vote
1answer
140 views

USB control panel with endless turn knobs

I understand that some arduinos are capable of presenting themselves as a USB HID device to a PC. I would like to use one to build a custom input controller that lets me read maybe 8 or so turn knobs ...
1
vote
1answer
157 views

How do I connect my Luxorparts keypad to my Arduino?

I just bought a 12 digit keypad from Luxorparts and it doesn't come with any schematics showing how it's wired at all. How do I figure out how to connect it to my Arduino?
1
vote
1answer
55 views

Input-Output Circuit Issue

I have design a circuit with 2 led (red and UV) and 2 button.So, the circuit supposed to work like this: If i press the button for red led, the red led lights up and the uv led turn off, and if i ...
1
vote
2answers
398 views

Input Capture Pin Atmel ATmega328P

I have some code that relies on the input capture timer value. I assume the timer value (as defined by the pre-scaler etc) is not affected by other code running i.e. it is updated every nth clock ...
1
vote
2answers
887 views

Reading Multiple switch inputs

I am trying to setup 20 input switches that can be pressed with hand. I am trying to get the output based on the pattern in which the input switches are pressed with the hand. Based on the pressure ...
1
vote
1answer
2k views

Digital input pin voltage treshold (voltage to register 1 or 0)

I was thinking of using multiple analog light sensors (variable resistance by light), but basically I only need to know if there is "a lot of light" or "not a lot of light". And would like to use ...