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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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DB:NO RESP Using inet.httpPOST on loop()

I'm using SIM900 module + arduino uno + gsmlib.org library. I'd like to send a string to endpoint on my API , and it worked correctly for the first time when I using inet.httpPOST function in setup(),...
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3answers
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How to convert an hex string to an array of bytes?

How to convert the char array to Byte array? I tried every method but it doesn't work. char CardNumber[8] = "B763AB23"; // Length is 8, basically it's in Hex // B7 63 ...
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1answer
4k views

GPRS SIM900 and GPS NEO-6M don't work together

I'm trying to get GPS coordinates and send them to my API through the GPRS SIM900 and GPS NEO-6M shields. In setup(), I first start the GPRS shield and call the function that connects to the internet....
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812 views

How would i capture and split serial data?

How would i capture the following serial data, and split it into parts? <Alarm,MPos:0.000,0.000,0.000,WPos:0.000,0.000,0.000> the parts i need from this is Alarm - This is a state. i.e Alarm, ...
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Atmel studio 7 - my own libraries

I like to use AS7 to make my programs. I know c and some c++, but how things work from there I'm green. I would like to know if there is a folder where I can store my own homemade c and h library ...
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401 views

How to connect Sparkfun M6E Nano UHF Rfid reader and ESP8266 NodeMCU 0.1

I am using an ESP8266 NodeMCU v0.1 and Sparkfun M6E Nano UHF Rfid reader. How to connect NodeMCU to M6E Nano UHF Rfid reader?
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5k views

Peer to peer communication

Hello guys , I want to perform a mesh network between 3-4 modules using ESP8266 . Any one have idea how to do it?
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1answer
78 views

How can I do this sentence show me in arduino [closed]

How can I do this sentence show me in arduino."WARNING: Category 'USB' in library Mouse/keyboard is not valid.Setting to 'Uncategorized'
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Increasing the numbers of I/O pins on Arduino Uno

I want to make a game of Tic-tac-toe using an Arduino, LEDs and bouncy buttons. Hence I need nine inputs and nine outputs. But you see that an Arduino only has 13 I/O pins. So is there a way I can use ...
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87 views

How to rotate two or more steppers simultaneously by giving ARRAY of angles?

The following is the code that I am trying but the problem is steppers rotate one after each other. However, I want to rotate steppers simultaneously. This code for two stepper motors. int pulse=3; ...
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2answers
422 views

Trying to understand Arduino products

Background: I am new to Arduino world, and I like to buy a board. I am a bit confused how Arduino products are being sold. Coming from Raspberry world, it seems that I don't know what actually ...
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1answer
279 views

Install Bluetooth inside a home theater, How?

I have a 5.1 home theater(old one), I would like to transform it into a audio streaming system. I have a Arduino UNO and HC-05 Bluetooth Module, and I don't know how to install it in my home theater(...
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455 views

What would be the code for using Arduino UNO to alert by sound or LED when it detects a certain position through GPS?

I am in grade 6. I have a very nice pet dog in my house but it often enters Mom's kitchen to spoil all the foods. So I am thinking of a device to attach with him which can locate its position. But I ...
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2answers
1k views

Error while uploading code with Arduino on breadboard using FTDI 232

My circuit is as seen and I hope there is no error with the wiring. I'm using an ATmega328P. The error suggests that the programmer is not responding and ten attempts issuing not in sync code. There ...
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2answers
405 views

Arduino nano power 5V or 12V and LED strip 2812B 5V

I would like to know a little more about Arduino inputs and outputs. Im doing a small project which is composed of 1 LED strip with 40 LEDs. Can`t find any definitely information about Arduino + ...
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1answer
635 views

Run exe or apk on Arduino [closed]

how to run exe file or apk file on Arduino UNO? Please suggest me any way to execute both file. Thank you.
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Installing a different firmware on Arduino

Is it possible to upgrade the firmware on an Arduino so that it can do more things such as change undervolting/ overvolting in order to provide more processing power. To do this you would have to most ...
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1answer
5k views

What are the SVG pins for on the SainSmart Uno clone?

I bought a SainSmart clone board which is compatible with the Arduino Uno R3. Alongside each of the standard IO pins, there is a row of 3 additional pins (male). They are arranged in columns, marked S,...
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5answers
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When Raspberry Pi is preferred over Arduino

We are doing some projects in class. One of my friends is doing a weather and humidity station using raspberry Pi with a couple of sensors and LCD. I have a little experience in Arduino. So I asked ...
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3answers
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Can I use arduino's 3.3 V output directly to esp8266?

I just bought esp8266 and ftdi usb driver, I want to power the esp8266 with Arduino's 3.3 V output, is that possible? I saw some tutorial on youtube in that they are suggesting us to use 3.3v ...
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1answer
13k views

How to connect new OV7670 FIFO to Arduino?

I bought a new OV7670 FIFO camera to connect to my Arduino UNO a few days ago. The picture of the cam board: I found this forum, it is nice try but it looks chaotic and confusing with about 50 pages,...
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1answer
196 views

cannot convert 'bool' to 'PinStatus' for argument '2' to 'void digitalWrite(pin_size_t, PinStatus) on Arduino Uno Rev 2 Wifi not working

I am a newbie to micro controllers and struggling to figure out how to fix this issue. When using an older Arduino micro controller it works fine, but when I use a new board (Arduino Uno Rev 2 Wifi) ...
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1answer
2k views

Digital Potentiometer not fading LED

So I am trying to test what will eventually be a Arduino controlling 3 110V motors that are currently controlled by an analog pot. But more on that later. I am trying to test out using a digital pot (...
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2answers
117 views

Is there any chance of fixing it?

I am new to arduino and robotic stuffs and I thought it would be a good idea to test circuits on my breadboard using arduino's R3 5V pin as power supply. The accident happened when I short circuited ...
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2answers
37k views

How does the reset button work on the Arduino?

I'm confused about how and when to use the reset button on the Arduino. Do I simply press the button while it is on? Is it simply restarting the board or clearing the uploaded code as well? Currently ...
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1answer
581 views

Is my ATmega broken, and would replacing it with another break that one, too?

I was communicating between my computer and my Arduino Uno R3 through Bluetooth using this Bluetooth module. The connector I use has a red wire where it connects to GND, and a black wire where it ...
5
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1answer
359 views

Can I link another device to the Uno's clock?

I'm trying to use an unusual 16x2 LCD display with my Uno. As far as I know, it's an EA-X16027AR. It doesn't seem to be compatible with the HD44780 driver, which is typically used for Arduino LCD's. ...
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2answers
2k views

Why bootloader sizes differs from 0.5 to 8 kilo bytes for different boards?

According to official web info bootloader sizes are 0.5, 2 and 8 kilo bytes for UNO, Pro mini and ATMega2560. I believe all three boot loaders do similar job of receiving serial link data and write to ...
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2answers
6k views

A question about resistance measurement with arduino

Lately I was asking myself about the possibility of measuring a potentiometer resistance with Arduino. My questions are: Is it possible? If it's possible, what kind of restriction does the Arduino ...
5
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1answer
213 views

Working with multiplexers for constant voltage output

I'm working on creating a circuit where I'm trying to have the ability to switch multiple strands of LED rope on and off at a time using an Arduino and a multiplexer. With my current configuration, ...
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5answers
5k views

Understanding why should avoid “String” and alternative solutions

Why “Strings” are bad for Arduino? Which is the most efficient and fastest solution to read and store the data from Accelerometer and GPS? Stings are evil for Arduino An Uno or other ATmega328-...
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2answers
258 views

OLED display crashes when connecting USB

I got an 16x2 OLED Display (DEP 16201-Y , compatible to the HD44780 controller) for my Arduino Uno and I got it to work in 4-bit Mode, but just if the USB isn't connected and it is powered by a 9V ...
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5answers
8k views

Stop Led's from blinking

My code: // Pin 13 has a LED connected on most Arduino boards. // give it a name: int led = 13; const int buttonPin = 2; // the setup routine runs once when you press reset: void setup() { // ...
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2answers
1k views

How can I connect the Tamiya double gearbox to Arduino Uno?

I'm working on building my first robot. this is my first foray into DIY electronics. I already have an Arduino Uno, and I have ordered the Tamiya double gearbox here. My goal is to control the gearbox ...
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1answer
4k views

Do I need to use a resistor if I am using a potentiometer to control an LED's brightness?

I am currently tinkering with an arduino, and am using a potentiometer to change the brightness of an LED. I understand that usually, a resistor is added to the circuit to limit the current flowing ...
3
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3answers
9k views

Why is my Adafruit motor shield not spinning my motors?

I'm using the Adafruit Motor Shield v2.3. I'm powering the Arduino with a USB cable and I'm powering the motor shield with a 9 volt battery. I removed the vin pin, and I'm using this tutorial/code to ...
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4answers
10k views

How to avoid blocking while loop reading Serial?

I am currently playing with a MindWave Mobile headset. I am parsing bluetooth data received from a connected BlueSMIRF Silver. The code I started from is a sample from the MindWave wiki and it works ...
3
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2answers
2k views

Atmega328P-PU: Programmer is not responding

Few days ago, I built my own custom Arduino on the breadboard. It is built according to tutorial on http://www.crash-bang.com/resource/breadboard-arduino/. The Atmega328P-PU is already burned with the ...
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2answers
2k views

Can I safely connect my original Arduino Uno to a 19V adapter?

I have an original Arduino Uno R3. According to the specifications the recommended input voltage is 7 to 12 Volt. However, I have a laptop adapter of 19V that I want to use to power my arduino ...
3
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1answer
1k views

Arduino in Eclipse IDE: How to add SPI library (core library already added)?

I want to use eclipse for arduino programming, so I followed the guides to set up a static project for the arduino core library. Then I added the library file (.a) and the .h and .cpp files to my new ...
3
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1answer
640 views

To connect a simple toy circuit and trigger with an arduino?

I have a small circuit from a toy sword that has an LED and a small speaker. It was powered by a couple of small coin cells. I am trying to figure out how to connect it to my Arduino so I can trigger ...
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2answers
2k views

LCD 16x2 Blank Display

I am using the following wiring diagram from a tutorial. I need to follow this configuration because later tutorials build on this example. I have looked at other solutions, but they follow a ...
3
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3answers
13k views

Stable frequency generation

I'm trying to work out the best way to generate a stable frequency with my Uno R3 I'm using interrupts to generate an approximately 40KHz frequency which drives some ICs/MOSFETs to effectively ...
3
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1answer
93 views

Arduino Uno R1 I soldered resistor but I cannot DFU program atmega8u2

I have an Arduino R1 board (the very first one) and I managed to solder the resistor into Arduino's Atmega8u2 (I went to a specialist in order to do that). Then I reset atmega8u2 and by wiring the ...
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4answers
12k views

SD card fails to initialize

I know this question has be asked before on this site. However it was never really answered. I have an Arduino Uno. I am trying to get it to read a 2 GB SDHC Micro SD card. The problem is, the SD card ...
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2answers
3k views

Connect Arduino to MySQL database online problem

I'm trying to connect Arduino with MySQL database on my online server. I manage my project to work on WampServer locally on localhost, but when I try to move everything online I have problem... on ...
3
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1answer
4k views

RFID-RC522 not working, red led is on

I am working with RFID-RC522 and Arduino UNO. I have check pin configurations again and again tried different libraries. It is not reading card and red led on RC522 is consistently on.
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4answers
2k views

How to make 1 second delay more accurate?

I have written two (1 second) delay programs. The first program as follows: void setup() { Serial.begin(9600); TCCR1A = 0; TCCR1B |= (1<<CS12); TCCR1B &= ~(1<<CS11); TCCR1B &=...
2
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2answers
390 views

Can I safely integrate 3,3v sensor with 5v Arduino UNO? How?

I plan to use Adafruit's RGB sensor with Arduino working as a RGB controller running on 5V. In my location, the 5V-compatible version of the sensor is not available. There is a 3,3V pin on my Arduino ...
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4answers
5k views

Interrupt fires multiple times

I have a Photo Interrupter which I am using to count the RPM of a motor. I am incrementing an integer to show the amount of interrupts there have been. The issue is that there can be several ...