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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2answers
61 views

GPS date and time not displaying correctly in Arduino Uno,NEO6M GPS module

I am learning how the Arduino and GPS module work so I can apply it to another project. My components are an Arduino Uno, NEO-6M GPS module, and a Adafruit 1.8" TFT display. The code did not work ...
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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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436 views

Using an ESP8266 with an Arduino Uno - can't get AT command to work

I am trying to connect an ESP8266 to my Arduino Uno. Connections: RX -> RX TX -> TX CH_PD -> 3.3v (Arduino 5v using voltage regulator) VCC -> 3.3v GND -> GND I am running the RX and ...
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757 views

Bluesmirf Mate Silver (RN-42) enter command mode when in HID mode

I am having problems getting the Bluesmirf Mate Silver (RN-42) into command mode once I have switched to HID mode. I have bought a second new Bluesmirf Mate Silver to confirm my issue. I soldered the ...
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43 views

How to convert RGB values to Intensity

I made an arduino color sensor with tcs3200 and arduino uno. I have coded the arduino to find the RGB values when I place the color paper below the sensor. How can I derive the intensity using the RGB ...
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204 views

Problem using Optiga Trust X I2C

Did someone ever used the Infineon Optiga Trust X module with Arduino using any I2C library ? Here is the technical documentation of the Trust X module. I'm trying to get the I2C_STATE register data ...
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38 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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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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1answer
35 views

Multiple data packets with CIPSEND, associate each with pathway

When using a CIPSEND from an Arduino Uno to a ESP8266 connected to the Uno is there a way to associate the data packet sent with a pathway so it can be retrieved at said pathway from the browser? For ...
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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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1answer
78 views

Can I use GSM and Data Logger Shield at the same time on one Arduino?

Me and my classmates are trying to make an arduino base project where we will be using sensors, GSM, and Data logger shield. We want the arduino to store the data collected and at the same time send a ...
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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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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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2answers
174 views

Elechouse Mo3 Shield Play Random Song

using this code to try and play a random song when someone walks by my distance sensor I get an error, the same song(track 0001) plays every time. Any advice? #include <SoftwareSerial.h> ...
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1answer
65 views

Burning Arduino Bootloader

I'm trying to use an atmega chip from an arduino on a breadboard, with minimal hardware (using the internal 8mhz clock). I am using the article in the link provided. When I reach the final step (...
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2answers
213 views

nRF24L01 - leaves out end characters during transmission

This is my Master's code. #include <nRF24L01.h> #include <RF24.h> #include <RF24_config.h> #include <SPI.h> RF24 radio(7, 8); const byte address[6] = "00001"; char text[20] =...
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1answer
258 views

Arduino - Extracting Multiple Strings from Serial Read

I am trying to write an Arduino code that reads a long string, example <11,22,33>, through the Serial Monitor and then stores the 11,22, and 33 into separate bins of a matrix array. So the user ...
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1answer
222 views

RadioHead and Servo compile problems

I am having this problem when trying to compile my sketch. I am using RF frequency modules to send data between devices and a servo motor to control the tilt of a ramp. I understand that both ...
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2answers
47 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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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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44 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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43 views

Burning Digispark bootloader without an Arduino

I've been wondering if there is any method to burn a Micronucleus bootloader into a blank ATtiny85 Digispark using just Windows or a Linux distro, and not needing another Arduino board such as UNO ...
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5answers
82 views

It is possible an Arduino generate 3d graphics on tft or vga

It is possible to an Arduino render 3d graphics like very low polygonal 3d models or generating lighting efects non realtime shadows or realtime shadows and reflections. Rendering like first 3d video ...
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1answer
224 views

Trying to use Tap Detection solution using ADXL345 with Arduino

I am using ADXL345 sensor connecting with Arduino via I2C interface, I am able to test the data at tri-axial axis but as there are some other features also, which I am going to try with Tap detection ...
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0answers
45 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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2answers
729 views

Arduino UNO/Nano communication with SP1ML-868 module

Good evening, I'm trying to establish serial communication between an Arduino UNO/Nano (ATMega328P) and a SP1ML-868 RF radio module (http://www.st.com/en/wireless-connectivity/sp1ml.html). I can talk ...
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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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2answers
69 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
86 views

Data received by Arduino from ESP8266 01 Module is not complete

I am sending some data from ESP8266 01 module to Arduino. But the data received by Arduino is not complete. Below are the images of the output from ESP8266 01 module and Arduino. Here is the ...
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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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1answer
271 views

Button state issue

Let me preface this by saying I'm a beginner, and I know my code must have some logic errors. I need some fresh eyes on this, I have been messing with it a few days and am just running in circles at ...
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2answers
4k views

When using an Arduino as an ISP, is the capacitor required or not?

Looking at Arduino as ISP and Arduino Bootloaders, it is stated The 10 µF electrolytic capacitor connected to RESET and GND of the programming board is needed only for the boards that have ...
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3answers
74 views

NRF24L01 Transmission Problems between Arduino UNO and Arduino Nano

I'm a beginner in using NRF24L01 tranceiver module. I tried sending a simple "Hello world" using Arduino Nano and a Arduino UNO with the use of two NRF24L01 modules. I don't get any output ...
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1answer
61 views

else if is ignored if not Serial.println anything before

I encountered to me inexplicable behavior on an arduino uno. I'm serial reading a string from the serial monitor/python serial. This string is the conditional on several if/else if statements. The ...
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2answers
206 views

Garage Door Opener RFID failing after a period

I've been building an add on to my garage door opener that will allow it to be opened from the outside with a valid RFID token or from inside using push buttons. This works as expected when first ...
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1answer
43 views

NRF24L01 +pa +lna modules do not communicate

I am building an rc airplane and I want the controller and the plane to communicate using 2 NRF24L01 +pa +lna modules. I am using an Arduino UNO and a Mega. I hooked them up corresponding to this ...
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0answers
37 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
20 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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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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1answer
44 views

TX,RX,ON,l LEDs were red at all time

First of all Thank you for reading my broblem.Before coming this erro I did a project in my Uno board by using a Bluetooth module.after that; when I powered the board to uploade another programe ;4 ...
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1answer
37 views

ESP8266-01 Wifi module + Wifi shield not present + ESP8266-01 libraries not working?

I have Arduino IDE v. 1.8.13. I bought an ESP8266-01 module which I want to use in my Arduino-UNO board to send fingerprint registration confirmation (ID) via HttpClient to a xampp server since I dont ...
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1answer
47 views

Code for 2 ultrasonic sensors

This is my code: int trigPin=13; //Sensor Trig pin connected to Arduino pin 13 int echoPin=11; //Sensor Echo pin connected to Arduino pin 11 float pingTime; //time for ping to travel from sensor to ...
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1answer
24 views

Arduino I2C Multiplexing uisng TCA9548A

I am using 5 sensors out of which two have the same I2C address and are connected via TCA9548 multiplexer. The remaining 3 sensors are connected to the main arduino I2C bus. In example sketches online ...
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2answers
48 views

How do I make my LCD screen scroll text while allowing for button input?

Here's what I want my code to do: This is part of a tea infusing project that would automate the steeping of tea, part of this is initially having a selection of either Black/Herbal tea or White/Green ...
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2answers
52 views

How to interpret Serial data received by Bluetooth module

I'm experimenting with a hc-05 knockoff the JDY-30 and am confused about the Serial data I'm getting from it. I downloaded an app called BlueUino to send commands from my Android to my Arduino Uno via ...