Questions tagged [arduino-uno]

The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.

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How to easily invoke Simple REST Service trigerred using Arduino UNO + ESP8266 WIFI Shield programmed with AT command?

My Question is How to easily invoke Simple REST Service trigerred using Arduino UNO + ESP8266 WIFI Shield programmed with AT command? I am new to this Subject and gone through many tutorial over ...
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1answer
24 views

Breaking out of the arduino fingerprint enroll loop

I am using the Arduino's Adafruit Finger Sensor library, and it has an example to enroll a fingerprint. I want it to enroll one print and exit/break out of the loop because it currently enrolls a user,...
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51 views

Problems with Arduino Uno Usb 2.0 shield when using a keyboard

I have an Arduino Uno and a usb 2.0 shield in which I connected a keyboard to. I have all the necessary libraries installed but what I am trying to figure out is how to light an led when I press a ...
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1answer
40 views

What is “tws_delay” and how can I use it? (with an ATTiny85)

EDIT: Alright I'm stupid, I had the 2012 library installed somehow, maybe when I downloaded it indirectly from another old tutorial site. Thanks a ton to Peter Freerick for pointing that out! It ...
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1answer
27 views

Sensor to send SMS

Hi guys I am building a sensor which will send a SMS when an object is identified. The sensor is installed at a staircase landing of an industrial property. An SMS should only be sent out when an ...
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1answer
44 views

EMI resets atmega on switching ON relay with inductive load like a 230v fan

I am making an automation device. I am using an atmega8a to control 6 relays. The setup is standard, 220v load, 5v dc coil, flyback diode and an NPN transistor to trigger with atmega pin. The problem ...
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31 views

Unable to use ir receiver and motor shield together

#include <IRremote.h> #include <AFMotor.h> AF_DCMotor motor(1); int RECV_PIN = 14;//The definition of the infrared receiver pin 11 IRrecv irrecv(RECV_PIN); decode_results results; void ...
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1answer
69 views

How I can send data information without work WiFi to LCD?

Hi everyone I am beginning learn coding and the second language English. I have small project I use Arduino uno , esp8266 , dht11 , lcd I2C and use blynk app in my project I have the code and work ...
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1answer
35 views

I want to program multiple arduino at once

I am aware that using a USB Hub you can attach multiple arduino to one computer and either upload code one by one or use bash script to upload code on all arduinos together. But you can attach only as ...
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23 views

Trouble with basic communication between two NRF24L01 modules

Introduction I am trying to setup a radio communication using the NRF24L01 module because I want to use it to control a tank. The first thing I did when I got the modules was watching some basic ...
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38 views

Chance light intensity in a pwm pin using LDR using Arduino UNO

I am using proteus and Arduino software to simulate my circuit. What I need to do, is to have an LDR in my Arduino uno. When light intensity increases in my LDR, I need another LED which is connected ...
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1answer
48 views

Program fails to check for potentiometer input/changes

I've been having a problem with my code that my potentiometer will not change values in a method. I'm having a random number generated, and if it is a specific number, print a statement and ...
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53 views

NRF24I01 with antenna Communication Delay

I am doing my senior design project which is due in a week, I am currently using the NRF24I01 with antennas for both the transmitter and the receiver. I am building a robot that is suppose to climb a ...
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1answer
54 views

What are the units of output of soil moisture sensor?

I want to use a soil moisture sensor using arduino uno R3. I am using the analog output. The values are in the range of 100 to 1300 as in the readings mention in this question. May I know what ...
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34 views

L293D to change the direction current and amplify it - Temperature-Stabilizer

I have a question about my project. I'm going to make a temperature-stabilizer. To make this, I think I should use a TEC with a H-bridge and a LM35. First of all, I tried to make a H-bridge by myself, ...
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50 views

How to get my LCD contentiously updating with data from sensor?

EDIT DOWNSTAIRS: Hello beautiful people of the internet! How are you smart people doing with all that's going on these days. Okay so the title says it pretty much. I've got a code and inside of my if'...
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65 views

Uploading a sketch without using the usb cable

I've lost my usb cable used to upload a Sketch to my arduino from my laptop. I do have my Bluetooth 4.0 module. Can I use it to upload my sketches?
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45 views

Project concerning wireless communication between raspberry pi (transmitter) and arduino uno(receiver) using nrf24l01. Receiver not working

We are trying to send a message using NRF24L01, raspberry pi as transmitter and arduino uno as receiver. Our concern is, the receiver arduino might not be working because we are not getting the proper ...
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187 views

POST request using WiFiEsp.h library

I'm using an arduino uno and ESP8266 (esp01) with the WiFiEsp library to connect to WiFi and POST data, connecting to WiFi works just fine. I need to send a POST request, but I can't get it to work ...
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55 views

Problem driving segment display

First off, I'm not really sure if it belongs here on on electronics stackexchange, since it involves an Arduino, some code and a small circuit. I'm trying to create a simple countdown timer using a 7 ...
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40 views

How do I adjust this?

We're supposed to create a Simon Says game for our final. My professor is telling me I shouldn't need to modify much with what I already have. but I'm so confused because it feels like starting over. ...
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1answer
187 views

Trying to control DC motor speed with PID

i'm trying to control a DC motor with PID. I have already made a code where i control the motor with an ultrasonic sensor (for distance) but now i need to run the motor at a given RPM (the Output). I ...
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1answer
51 views

I need to change this code to start the section of code when the switch is on and not when the switch is released

I have this section of code. It works fine and how I want it only, it executes when the button is released not when it is pressed. My application needs to execute this code when a switch is on. The ...
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69 views

Problem burning bootloader to ATmega chip using nano/uno

I designed a custom PCB that has the chip, an oscillatorm, decoupling capacitors, and all other connections for the ATmega along with the rest of my circuit. I followed all steps in the tutorial for ...
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1answer
29 views

Using Arduino Wifi Shield to Receive Signal

I am trying to use an Arduino Uno with Arduino Wifi Shield 101 to receive a signal from phone or webpage over wifi so it will "initiate" my circuit. I was able to connect the board to wifi but am ...
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62 views

Infinite loop if Serial.println() is not used

I'm trying to reset my program from software using the third method described here: Reset an Arduino Uno in code The function is basically showing some data on an OLED display and afterwards should ...
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1answer
2k views

Are there any alternatives to Tinkercad Circuits that is PC application based instead of web app based?

I have been using Tinkercad's Circuits web application to create my Arduino circuits and apply my Arduino code (c++) for testing. Despite the amazing product they have and the fact it's free, I find ...
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1answer
266 views

How to connect two LED strips (APA102/SK9822) to Arduino UNO?

So what I am trying to do is to connect two SK9822 LED strips to Arduino UNO. I am a bit confused about how to properly set this up so I can individualy control any led. So obviously 5V should go to ...
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1answer
81 views

I´m trying to make a kind of videogame with Arduino UNO

it´s a school project, but I'm having some problems to create a menu selection. In the LCD, all the character are overwriting, I'm a beginer, so i dont have any idea of what i was doing wrong (ps.: ...
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667 views

Ethernet Shield Issue

I just bought a Ethernet Shield for my Arduino UNO. I connected it to my arduino and flashed the Example code for Ethernet Shield, but the code didn't work. The COLL LED on ethernet shield is glowing ...
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172 views

STM32 Nucleo-L432KC can't send data to Arduino Uno via nRF24L01 module

Hello everyone. First of all, I know you're going to tell me to send my question on the stm32duino forum. But I tried to enter the stm32duino forum and I didn't succeed (I think their forum is closed)...
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315 views

How can I pause a stepper motor with a ultrasonic sensor?

I'm trying to use a stepper motor to stay stationary and rotate about 90 degrees, when the ultrasonic sensor detects something in front of it, and stay at that position until the ultrasonic sensor ...
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91 views

RFduino device required for RFduino hex file

So I have been working trying to measure the velocity of a string attaches using Rfduino microcontroller. I have downloaded all the library(based on https://www.youtube.com/watch?v=K0JiPQnrkHQ) and ...
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118 views

Unable to upload to Arduino Uno From Raspberry Pi

I am trying to upload code to my Arduino Uno from my Raspberry Pi 3B+ and have been following this guide. After following the instructions and trying to upload, I received this error message. pi@...
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44 views

Data not uploading on Thingspeak server using ESP8266-01 Wifi -shield

Here's the problem. My sketch has NO errors in it. I can see the output in the Serial monitor but the data is not being uploaded in ThingSpeak server. I've tried changing the API KEYs but it a'int ...
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39 views

Sound sensor dont work in whole project

When I put this code only on arduino, sound sensor works: int soundSensor=A1; int LED=5; boolean LEDStatus=false; void setup() { Serial.begin(9600); pinMode(soundSensor,INPUT); pinMode(LED,...
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46 views

Arduino Uno - Stepper motor not working with button

I am completely new to Arduino, and all sorts of hardware and software. I have a stepper motor, which I want to rotate by a number of rotations when I press a button, and then go backwards by a number ...
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67 views

I can't write or read data in an external eeprom

I've been trying to store data in an external I2C EEPROM but it doesn't seem to work, and i don't know why. When i run the i2c scanner it founds my memory but i can't write in it, or at least it ...
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58 views

How to get interrupt while in sleep mode?

I am using Arduino-uno, attached ESP-01 module I want to give interrupt when I send some wifi-signal to arduino, which is in sleep mode. so I write this code: SoftwareSerial esp(2, 3); // RX, TX ...
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32 views

If an Arduino goes to sleep, does the attached ESP also sleep?

I am using Arduino Uno + an attached ESP-01 (ESP8266). I want to save battery, so I made my Arduino get sleep & interrupt by a watchdog timer. But if the Arduino goes to sleep, does the attached ...
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450 views

read with Arduino SSI encoder signal

I'm stuck in my project, I try to read an absolute encoders angular position with my Arduino. I used and cabled a differential line receiver and driver between Arduino and the encoder, like explained ...
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123 views

Post Data Server from Arduino using Fuzzy Logic

Can somebody help me , when i run this code separately , no problem was found , but when i fuse it together , only fuzzy work and the data can't be sent to my server, sorry for my bad english i ...
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89 views

Having problem in coding Arduino Uno

I'm making a timer program which takes the Time Duration as input from the user by two button switches (one for 'up' and one for 'down'), and after pressing an another button switch ('start'), the ...
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81 views

Capacitive Moisture sensor only shows values 1 and 2

I'm new to Arduino and electronics in general. I'm trying to connect the Capacitive moisture sensor v1.2 to my arduino and get values in the serial plotter. I connected the VCC to 5V, GRD to ground ...
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62 views

Trouble operating Servo and GPS at the same time

I have a problem using a servo and a GPS board at the same time on an Arduino Uno. For the servo, I use the following code: Servo myservo; // create servo object to control a servo // twelve servo ...
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337 views

Unable to control servo with decoupling capacitor and external power supply, but motor shield works

I'm a hobbyist trying to up my arduino and electronics knowledge. I can successfully control a hobby servo using an motor driver shield (https://learn.adafruit.com/adafruit-motor-shield/overview) but ...
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27 views

UV sensor help!

I am creating a uv sensor. The sensor detects a certain amount of UV light and turns on the respective light (eg uv of 1-3 turns on a blue light). However I am getting an error: "expected primary-...
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475 views

Fingerprint sensor Arduino IDE code errors (Arduino Uno)

This code is for a fingerprint sensor. I keep getting the "function definition is not allowed before '{' token" error on the Arduino IDE. Any further corrections would also be immensely appreciated. #...
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142 views

Can't get the right values with the pulse sensor and the LM35 temperature sensor . Reading 2 anolog sesnors

I am trying to combine the two sensors (pulse sensor using this library and LM35 temp)(on a Arduino UNO board),but there is a problem with them when is a noise at the pulse sensor .The values are ...
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688 views

invalid conversion from 'byte {aka unsigned char}' to 'void (*)()' [-fpermissive]

char auth [ ] = "8439"; // Wi-Fi credentials . char ssid [ ] = ""; char pass [ ] = "chan"; const int SENSOR_PIN = A0; const int RS = 0.5; const int VOLTAGE_REF = 32; const byte ButtonPress = 2; const ...

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