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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9 views

Detecting different objects closeness

iam currently working on a new project, where i would like to detect the existence/closeness of several objects around the arduino up to like 1 meter. I was thinking about an rfid setup, but as the ...
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WS2811 lights only turn red

I've connected a strand of WS2811 to a 5V power supply and an Arduino Uno and no matter what I do the lights are always red. I'm using the fast led library and for some reason, the WS2811 lights are ...
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Can i use arduino to send i2c to azure or AWS

im looking to monitor temp and cycle counts on some machines. i want to be able to collect this data. Is there an Ethernet port/Shield for arduino. also im currently using Arduino UNO Ardunio Mega2560 ...
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21 views

Arduino SD card module failure

I am recieving SD card failuer and I did everything I could. I use the correct SPI pins; CS > 10 MOSI > 11 MISO > 12 SCK > 13 VCC > 5v GND > GND I did format my SD card to FAT32 I ...
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19 views

Arduino UNO not sending serial data to ESP32

Lately I've been struggling with Serial communication between Uno and ESP32. I'm trying to send a simple string (In my case "100") from my Uno to my ESP32. I made a voltage divider and I'm ...
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21 views

Help with reading and storing data from sim module

I'm using a sim800C module and an Arduino Uno. I want the code to send back an SMS to a number which sends it the password. So, if the sim module receives 'abcd' I want it to send back an SMS, saying '...
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33 views

Why my code isn't working?

I wrote this code, but it doesn't work (what I want is that the program choose a random color and turn on or off an RGB led) I use transistors to turn the led strip on or off and analogWrite(pin, ...
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16 views

problem with Arduino robotic hand, nrf2401 red light [closed]

I'm making a robotic hand and I upload code to both the transmitter and receiver, however when I bend the flex sensor the servos don't move but instead the nrf2401 just has a singular red light on ...
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27 views

Wemos D1 mini serial monitor output

I'm using a clone of the Wemos d1 mini board, and am trying to connect a limit switch to it. I used some very basic code, taken mostly from the Arduino.cc example on how to test a digital input with ...
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Motor not working with L293d shield

My code uploads to Arduino but the motor is not moving when I connect it to the L293d motor driver shield. I am supplying 12V 2A to the shield through an adapter, connected to dc motor at M2. tThis is ...
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26 views

Uno - ESP32 SoftwareSerial communication won't work

I have two boards, Uno and ESP32 and my goal is to send data from the Uno to the ESP. I made a voltage divider so my ESP doesn't get fried and I use the communication only in ONE way, strictly UNO -&...
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Continuous push button detection in for Stepper control

Currently i've working code of controlling stepper motor with pushbuttons. So, basically i have to press two push button to run forward and backward. but the problem is , when i press 1st pushbutton ...
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40 views

Arduino ESP8266 GPS integration issue

I am facing issue in using 2 Serial communication device with Arduino uno. I am trying to use ESP8266, Neo 6M GPS module with Arduino UNO, but only one of device is working at a time. Is there any ...
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31 views

nRF24L01 only getting 10 meters range!

I am making a project where I need to communicate between two devices that are about 300-500 meters apart and might experience a lot of RF interference and obstacles. So I thought for initial testing ...
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2answers
91 views

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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1answer
26 views

Which are the unused digital pins after L293D motor sheild installation on Arduino Uno board?

I have just started my first project on auduino. I have a arduino uno and a L293D motor sheild. I have installed the motor sheild upon auduino uno board and the motor sheild cover all pins of arduino ...
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16 views

Infrared remote transmitter circuit [closed]

Hi I want infrared remote transmitter circuit having more than 10 keys for Arduino project. My application is control device using infrared. On reciver side I'm using infrared infrared sensor ...
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29 views

Locate a second arduino accurate. Auto following bike trailer [closed]

My neighbor recently had an idea about a (at least nearly) wireless bike trailer, which follows the bike by its own. Now I try to figure out how to build the electronics. I want to send break and gas ...
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26 views

Please , explain about MAX30100 using for Arduino to read ADC in format (0-1023)

can anyone help me..? I am using MAX30100 with arduino, and my expectation is i can to process the ADC as usual (0-1023), but I do not understand the signal processing. Has anyone used the MAX30100 ...
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1answer
29 views

Problems Sending Signals to the Arduino-Uno via 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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12 views

HC-12 AT Commands not working

I'm currently working on HC-12 transceivers. Normal operations are fine and I was able to successfully transmit basic strings between an Arduino UNO and and Arduino Nano, both of which use HC-12s. ...
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1answer
72 views

Why is my CNC shield smoking? Is it safe to keep on for long periods of time?

I am working on a project that involves moving stepper motors, and the device will have to be on for upwards of hours. I am moving the bipolar NEMA17 stepper motors using a Protoneer CNC shield V3 on ...
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24 views

How to connect an ESP8266 to my Arduino UNO with a CNC shield on top of it? [closed]

I am currently working on a project that involves using Alexa to control bipolar stepper motors via voice command, i.e., "Alexa, turn 2 revolutions." "Alexa, turn -180 degrees." I ...
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18 views

How much power should I supply to L293d shield to run 4 tt gear dc motors and 1 servo sg90?

I'm new to Arduino. I am trying to making an obstacle avoiding car using Arduino Uno and L293d motor driver shield. Four tt gear dc motors and 1 servo motor were connected. How much power should I ...
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1answer
27 views

Arduino ESP8266 Wifi Shield GET request with LiteESP8266Client stops after few HTTP request

Below HTTP Get request is working but after few GET request(5-6) the code stops and once I press Arduino reset button then only it start working. Probably looks like something is causing OOM: // This ...
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Need Help in Programming [closed]

I NEED HELP IN PROGRAMMING. A code for a line follower with 1ldr 2bo motor 1 motor driver 1 Arduino Uno. //////////////////////////////////////////////////////////////////////////
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17 views

Ultrasonic sensors not working

The target of this is for the system to print "Done" when distance, measured by 2 ultrasonic sensor, is between 6-17 cm. This is my python code: import serial arduinoSerialData = serial....
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1answer
21 views

Unable to read Arduino+ESP8266 full get Response

Using below code I am able to invoke HTTP Get request, but I am not able to read full HTTP Response. Observing only output like( +IPD,0,141:HTTP/1.7. ). Please let me know how can I read full response?...
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32 views

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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11 views

CAN Bus Shield Initialization Failed

The Problem I've been working on a project that requires the use of a CAN Bus Shield v2 on an Arduino. For most of the time it has worked great, completely as intended. But recently, I was trying to ...
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31 views

expected unqualified-id before numeric constant [closed]

hellow. class Easy_Drv8833 { private: int Motor_A_1; int Motor_A_2; int Motor_B_1; int Motor_B_2; enter void pinSetup(){ pinMode(Motor_A_1, OUTPUT); /...
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39 views

Why do we use HX711 with load cell (Why do we need A to D conversion)?

We generally amplify the signal from load cell but why there is need for A to D (analog to digital) conversion?
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1answer
22 views

Send a string from python GUI to NodeMCU serial over wifi [closed]

I have working prototype of sending data from python to Arduino serial using Serial library. But all i want to do it wirelessly. any tips? Also, is it possible to send a string to nodemcu without ...
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22 views

python code to wait for push button to be pushed [closed]

I am using python to control an arduino.I want the python code to wait for the button to be pressed, and then move onto the next line.In the current code I have, the code sleeps for x seconds and ...
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43 views

How to separate in columns the data contained in a barcode

I have the following code, which allows me by scanning a typical 128 barcode to write this code in SD card under the Header "FA" as well as the time and date of scanner under the Header &...
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45 views

What Minimum Value Can I Measure With ACS712 30A Current Sensor?

I am making an Arduino multimeter for current measurement. I first thought about using a shunt but that fails to work since I need to measure current in the mA range.
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24 views

DHT22 Failed to Read Temperature

Readings are good at a distance of 30cm(approx). But gives NAN error beyond. Even at 30cm, it some times gives NAN. What maybe the issue? Tried with 10k pull up resistor also. Maybe a fake product as ...
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46 views

Digispark Atinny85 not recognized (bootloader problem)

I recently bought the Attiny85 (picture below) I managed to install it correctly following the official guides, never that a problem. Drivers are installed correctly, and I used the Arduino IDE to ...
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1answer
19 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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2answers
48 views

I want 2 output pins to working alternately

I have given pwm output on pin(9) and I Want pin(10) to be high when pin(9) is low and pin(10) to be low when pin(9) is high. So what should i add to my code?
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26 views

I have 2 Arduino programs that work separately. How can I merge them? [duplicate]

IMPORTANT* I am new to this. A virgin to code I dont understand the millis function I have two solutions in mind but uncertain of how to format Solution 1) use scheduler / or millis to ledR high for ...
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28 views

ESP8266-01 WiFiEsp Timeout error

I am using WiFiEsp Library, ESP8266-01 Wifi Module, Arduino UNO and Arduino v.1.8.13. ESP Details: AT version:1.2.0.0. SDK version:1.5.4.1(39cb9a32) v1.0.0. The module is also in AT+CWMODE=1. My ...
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1answer
25 views

Cant upload arduino code when ESP8266-01 module is connected

I'm using this tutorial to connect my ESP8266-01 WiFi Module to Arduino UNO with Arduino IDE v. 1.8.13. It works and the module can connect to my WiFi. However, when I try to upload my code, it says: ...
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46 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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30 views

Ardutester Millenium I2c Lcd Not Showing Anything!

Hiii Friends...., I am Trying to Build Components tester Using Arduino Specifically Atmega328p Chip . I Downloaded The Ardutester Millenium Code From Here .. https://create.arduino.cc/projecthub/...
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38 views

Multiple sensors I2C stop working suddenly

I am using multiple temperature sensors using I2C. Some of the sensors are connected via TCA9548 multiplexer. When I run the sketch it runs fine for a few minutes but then it suddenly stops working ...
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1answer
21 views

String array length in function

I know this question has been asked a thousand times, but I can't find a solution for my case. I what to get the length of a string array in a given function. This is for an arduino board. #define LEN(...
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1answer
38 views

Issues with Arduino UNO printing repeated “double” on serial monitor

A weird is happening which i can't figure out why. First I had issue communicating with SIM800L. So i tried checking the USART Hardware to see what UNO sends to SIM800 using small piece attached below....
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2answers
74 views

Jumping to bootloader from application code in atmega328p

I'm trying to program an Arduino Uno (atmega328p) using only the serial Tx/Rx lines (no DTR, so no automatic reset). This is so I can upload code via WiFi/TCP using an ESP-01. To achieve this, I need ...
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1answer
26 views

Calling a localhost php script from arduino

Is it possible to connect arduino uno to call a php script using ONLY an arduino uno board, and an esp8266-01 wifi module.? That is, I lack wifi shield such as node MCU. I just need the setup to call ...

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