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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27 views

Recommendations For High Capacity Microcontrollers

For a new project I'm working on, I'm turning an old Casio Personal Mini into a Speak & Spell (with possibly other functions). However, the speech library I plan on using is Talkie, and it takes ...
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2 devices on arduino uno [duplicate]

Might be a stupid question (not too experienced), but when I upload two different pieces of code intended for two different devices connected to the arduino, does it overwrite the first upload and if ...
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ds3231 rtc module weekly alarm

I have a ds3231 and Arduino UNO and I need to get an interrupt from ds3231 once a week for example every Fridays. I've searched a lot in the internet and forums but did not find any library or code ...
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Saving and retrieving date in Firebase?

I am trying to make read data from Arduino uno board then send them to firebase through esp8266. I want date and time in string format can anyone help me in this problem ? I want it in below format- ...
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27 views

Storing IR Sensor value not working

This is my first time working on Arduino for my project and I ran into an issue. I'm trying to make a very simple Vending Machine. Coin or any obstacle passes in front of the IR sensor and based on ...
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1answer
40 views

74HC595 to 5v pin shuts down uno

I'm new to using the SN74HC595 shift register, and trying to follow this tutorial: https://www.arduino.cc/en/tutorial/ShiftOut based on this configuration: When my arduino Uno R3 is plugged in by USB ...
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1answer
26 views

Joining several PIR sensors

I wish to use some PIR (HC-SR501) sensors and give some response if at least one of them detects human movements. For simplicity I wish to use only one input pin in an Arduino UNO. My idea is to ...
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2answers
34 views

External Button Interrupt (Digital Pin 3) of Arduino not working

I am trying to execute external button interrupt with Arduino and 16*2 alphanumeric LCD. What I am trying to do is when I press the button then the screen should switch between different options. When ...
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20 views

Make WiFi Router Using Arduino board

void switch_led() { bool SwitchReading = digitalRead(SWITCH); if (SwitchReading == HIGH) { Serial.println("Now pressed...."); state = state + 1; if (state % 2 != 0) { digitalWrite(LED, ...
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29 views

Arduino glitches and makes 240 < 7 and -240 > 7

I'm experimenting with the joystick and the MAX7219 module (8x8 LED display) and i made this program: #include "LedControl.h" LedControl lc=LedControl(11,13,10,1); int Xo = 36; int Yo = 34;...
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Connect two SD cards to one Arduino board and copy from one to another

I'm trying to connect 2 SD cards to an Arduino Uno board. My first question is: Is it possible to connect two SD cards to one Arduino simultaneously? The second question is: If it is possible to ...
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2answers
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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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22 views

Arduino using delay in I2C receiveEvent

I have read before that you can't use delay() inside I2C receiveEvent because it is an ISR. What I want to do is as follows: I have a servo connected to my Arduino Uno and I want to control that using ...
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41 views

Problem reading input data using SoftwareSerial library

I can't read data using SoftwareSerial library, because SoftwareSerial.available() is always 0, no matter what I do. I'm trying to communicate 2 Arduinos Uno, the 1 Serial (name of the first Arduino ...
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25 views

How to map floor using arduino and HC-SR04 [closed]

I am working on a bot controlled by Arduino-UNO using HC-SR04. I want my bot to go around the floor, avoiding all obstacles, covering the entire floor. I tried measuring wall distance on all sides ...
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27 views

Control Servo motor via Python GUI (PyQt) component “QDial”

I want to control a servomotor via a Python Gui (PyQt) component "QDial". Hopefully the servomotor should rotate "simultaneously" with the Dial in GUI. Below is the related code: ...
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50 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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1answer
20 views

What does display.setSegments(&segto, 1, 1); do?

I am using a TM1637 display for my Arduino Uno. The goal was to just light up one point of the colon in the middle - what seems to be kind of impossible to accomplish. During research I stumbled over ...
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28 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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2answers
49 views

Power Arduino and LED strip

I saw this question about powering Arduino and LED strip. So, I searched for a 5v 4a power supply and foud this one. How does that adapter provide power for both Arduino and LED strip? I thought I ...
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1answer
33 views

I can't run shell commands on Linux through AVR sketch (Arduino Yun)

I'm a little confused with some Process.h methods. I'm trying to run the command "nc 192.168.1.15 9911" to the Linux processor through a sketch. The appropriate netcat listener is waiting on ...
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42 views

Why is my passive buzzer clicking instead of buzzing when set to HIGH?

everyone. I am working on learning Arduino from scratch and I am on the buzzer lesson. The tutorial I am following consists on writing a code to get an input from the user in the form of an integer ...
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48 views

Why doesn't this code work as expected? [closed]

I expected the LED on ld1 (pin 7) to flash with a period of D1 (300) milliseconds. Similarly for ld2 (pin 8) with a period of D2 / 1000ms. int ld1 = 7, ld2 = 8; /// led out put int D1 = 300, ...
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2answers
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What do you do when you finish a project?

I have just about completed my first Arduino project using an Arduino Uno board, but is that what I use inside the finished device? I figured I’d keep the Uno for future projects and have something ...
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56 views

How to use Atmega328p-PU from an Uno, on a breadboard without a crystal

How do you use Atmega328p-PU from an Uno, on a breadboard without a crystal?
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37 views

Arduino IDE sketch for firebase-Dragino Shield v1.4

I would really appreciate it if someone could recommend a sketch for Arduino IDE that I can use to connect my arduino Lora shield v1.4 to firebase. All the sketches I find are for only esp8266 module. ...
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1answer
55 views

Uno went in washer and when I shake I hear something shaking around. What do I hear?

My friends Uno went in washer. I gave it a week to dry and when i plug it in, it works. But when I shake I hear something shaking around inside it. What do I hear shaking around?
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48 views

Junk values in EEPROM. while writing large values

Facing an issue while writing a large value (like 2000-5000) to EEPROM using EEPROM.put(). For example, While writing 2000 values to address 5 of EEPROM. Some junk values are written automatically to ...
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1answer
34 views

QR code scanner connected to arduino won't respond

i bought a qr code reader from banggood, here's the link: https://www.banggood.com/GM65-1D-2D-Code-Scanner-BarCode-Reader-QR-Code-Reader-Module-p-1440532.html?rmmds=buy it works pretty well and i'm ...
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2answers
57 views

How can I make my Arduino Uno press Space on my laptop keyboard?

So I wanna build something which, when it receives a remote signal, presses the spacebar on my laptop keyboard. I tried using the Keyboard.press() but it is available only for Leonardo. Is there any ...
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1answer
48 views

How to get data out of loop?

hi i wrote a code(i modified it actually, please forgive me, im in a mess please help me if you can) for my esp8266 to serial communicate with at tiny 85 ,it will monitor switch state and publish ...
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1answer
34 views

SPI Slave Programming for Arduino

In my application Arduino Due is configured as master and instead of the actual slave device I am making use of Arduino Uno as Slave.I will share the Master code which I have worked out. Can Anyone ...
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1answer
27 views

Motor does not work for a specific case when programming with L293D motor driver shield

I tried to make a car that moves using a 4x4 keypad. Pressing "12" unlocks the car and sets the motors to move forward. After that, if I press 4, the speed of the left motor is reduced to ...
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3answers
70 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
27 views

Error while inputting EEPROM.read() and EEPROM.write()

I am trying to store data in ATmega328 (Arduino Uno) using the following code using tinkercad: #include <EEPROM.h> void setup() { int addr, data=1; Serial.begin(9600); for (addr=0; addr&...
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9 views

Adafruit v2.3 Motor Shield Initialization Failure

I would appreciate any help solving this as I have spent several hours trying to debug. My code seems to stop when I get to the initialization of the motor shield. motorShield.begin(); #include <...
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1answer
20 views

How to connect HC-06 with HC-08 with the HC-06 as master and HC-08 as slave?

How do you connect HC-06 with HC-08 with the HC-06 as master and HC-08 as slave? I will try it using 2 Arduino Unos.
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13 views

HC-08 Bluetooth module not showing up on iPad

I have an HC-08 Bluetooth module Bluetooth module hooked up to an Arduino Uno but for some reason, it doesn’t show up in the Bluetooth menu in my iPad settings. Can you help?
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15 views

How to upload code to an Arduino Uno using HC08 Bluetooth module

How do you upload code to an Uno from a Mac using the HC08 Bluetooth module? I know I need to use this wiring. Anyone know?
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1answer
26 views

Arduino Uno R3 cannot detect GPRS Shield SIM900

I am new to Arduino which I got only this week for my project which sends sms from my windows application. I have Arduino Uno R3 and GPRS Shield (Simcom) Sim900 (S2-1040S-Z0912) I am currently ...
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2answers
93 views

Communication between 2 arduino boards

I am not really 100% too sure how to do this but I am trying to make my arduino UNO communicate with my arduino MEGA. The reason why I needed to do this was because I was using the RFID module along ...
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2answers
39 views

How to produce rolling count per minute?

I have a counter attached to ISR: void ISR_impulse() { CNT++; } and I want to calculate rolling count per minute with arbitrary update rate. However I can only get it to update every minute: void ...
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26 views

Connecting OV2640 with 17 Pins Binocular Camera module, to any microcontroller (System clock on module pin 18 -NC)

These pins are on the module: 3.3V GND VSYNC SCL SDA HREF D0-D7 DCLK PWDN I have tried many codes and connections of the OV7670 Monocular cameras, none seem to work(Instructables , Circuit Digest , ...
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30 views

Radino40 Breakout Board

I would like to control the Radino40 breakout board with arduino. But i don't know if is it possible. I know that the single Radino40 DW1000 antenna could controlled by Arduino through SPI, but my ...
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2answers
44 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 ...
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24 views

how to serially off leds in an esp running mqtt

hi im using at tiny 85 to monitor dc switches and to serial print with this code below to esp8266 with local broker to turn leds on and off but its only working through mqtt but not with physical ...
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36 views

I2C master's output is always 255

we are using 2 Arduino UNO as a master/slave for this i2c protocol. we used the first Arduino(slave) as a sensor that will input dummy data (in this case, temperature data). the Arduino(master) should ...
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34 views

Arduino Freezes after some time

I made an project that takes data from DHT sensor and sends it through sms if requested. I think it is some kind of memory issue but I want to know if I can do something about it. It would be very ...
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1answer
95 views

Implement two processes at the same time

I am a beginner in arduino and due to the lockdown I have been learning it by implementing it on tinkercad. I have made a simulation where I have attached : Servo Motor Ultrasonic Sensor Led Bulb ...
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20 views

Capturing samples with MPU-6050 [duplicate]

I would like to generate vibration patterns using the MPU-6050. So if a 10p coin was dropped on a table from 1m at a 90 degree angle then I would expect the second time it dropped to make the same ...

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