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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is there any possibility of connecting ACCELEROMETER + ARDUINO UNO + GSM module together?

I am lakshman a mechanical engineer,i have a question that is there any possibility of connecting ACCELEROMETER + ARDUINO UNO + GSM module together??? so that i can take the output value from ...
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62 views

Problem with my arduino board

I had attatched a GSM module to my arduino Uno board. The power had been switched on. The GSM 5V pin was connected to my board. I was still midway with my work so for some reason I gave an external ...
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1answer
4k views

Can I do parallel processing in Arduino?

I recently got to work with Arduino and I want to get parallel input from 5 LDRs and at the same instance I need to light a LED corresponding to that LDR if the resistance got high. I read about a ...
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3answers
139 views

Replicating Tx and Rx LEDs

In my application all of the Arduino Uno LEDs will be invisible inside an enclosure, so I wish to provide panel-mounted Tx and Rx LEDS just replicating their on-board counterparts. Is there a way to ...
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2answers
2k views

How can I dim a 10w LED?

I'm trying to dim a 10w LED via Arduino PWM. This is the LED that I have: http://www.banggood.com/10W-Warm-Pure-White-High-Brightest-Save-Power-LED-Light-Lamp-p-88169.html Without knowing much about ...
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1answer
609 views

It seems my Arduino doesn't work

I've got an Arduino Uno. I was building a simple circuit with only one switch and it doesn't seem to work (I followed the Arduino project book from the Arduino starter kit). This is my circuit : ...
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1answer
1k views

SMS in modem's memory

I am working on SMS communication with my phone and Arduino. My intension is simple. When somebody send an SMS, the Arduino should read a text file located on my server and forward the content to the ...
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0answers
283 views

sending midi to software using arduino [closed]

Friends Here is what i want to ask. I have a midi keyboard that is casio cps7. Its an old model so its not a USB midi keyboard. I use it with a cheap midi to usb cable. I just wanted to use my ...
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1answer
3k views

Problem Uploading to arduino uno board

I have an arduino uno. Whenever I try to upload code to the arduino I get this error. avrdude: ser_open(): can't open device "/dev/cu.usbserial-AL01EI7I": Device not configured ioctl("TIOCMGET"): ...
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1answer
765 views

Pinout of Arduino 9 Axes Motion Shield

I bought an Arduino 9 Axes Motion Shield without looking at the pinout. I'm worried it won't work with my Adafruit Motor Shield v1. It seems the 9 axes shield uses I2C, a reset pin and several other ...
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1answer
853 views

Not in sync: resp=0x00 [duplicate]

I had problems with Arduino uno and reseted firmware. Followed this tutorial. Now I can't upload my code Arduino IDE says: avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync(...
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2answers
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What is the proper way to turn an Arduino UNO into an ISP?

I have a bricked Arduino Uno and I want to try to flash the bootloader. I'm trying to figure out how to do it. On this tutorial from SparkFun you can see this diagram: They also show this table of ...
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1answer
348 views

Power source for Arduino uno, sparkfun usb shield and adafruit motor shield

I'm having trouble powering my boards altogether. Right now, I'm using 8x AA batteries to power everything. Running my arduino with one shield runs fine, but not with both shields stacked on top of my ...
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1answer
132 views

Scroll LCD display connected to an Arduino Uno

I want to make some characters scroll left without affecting the first positions in each row of my LCD 16x2 screen. I have this code inside the loop so far: lcd .clear(); lcd.setCursor(17, 0); for (...
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1answer
94 views

Will there be any pin interference in this Project?

I am working on a project with Arduino Uno Clone. After having a look on my arrangement, please tell me whether I will have to face any difficulty or consider any thing. I have a relay on pin 2 (...
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3answers
2k views

How can I make motor vibrate using arduino depending on the ultrasonic distance?

I want to make the vibration motor vibrate depending on the distance to an obstacle, for example if the distance is too short it should vibrate quickly and vice versa. How can i make motor vibrate ...
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1answer
941 views

Speeding up Arduino DC Motors

I am using the Adafruit Motor Shield v2.3 for Arduino Uno. I am using the analogWrite() command to power my DC motor and have set the speed to 255. Is there any way to speed up the Arduino motor even ...
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2answers
363 views

What's the difference between setting a variable outside a function and setting a variable inside a function?

I'm programming C++ for arduino and today I have seen an example like this void loop() { byte variable = 0; // << This variable is the question. //more stuff here } Is the same as this?...
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3answers
115 views

Where to start?

I am totally new to Arduino and I'm a real beginner with electronics and robotics. I would like to know where to start, knowing that my ultimate goal is to build an autonomous robot (I know that I ...
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2k views

Sending and receiving custom messages with Ardulink

I am sending custom code to Arduino with this ardulink command: { ArduinoControl.link.sendCustomMessage("oled"); } Code from standard Ardulink sketch CustomMessagesChipKit.ino: { if (...
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1answer
3k views

How to read a Text file from server and store to a separate variable?

I am working on reading a text file from the server, using http://arduino.cc/en/Reference/GSMClientConnected. It gives me this code: char path[]="/asciilogo.txt" I want to store only the contents ...
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2answers
999 views

How to avoid delays in the loop() function?

vI have this functions in my loop() and it publishes temperature reading to Ubidots(an IoT cloud service) using the #include library but it seems it returns a boolean and so the loop is delayed until ...
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1answer
66 views

Arduino uno not writing to file

I'd like the arduino to write to a file whenever an ajax call is made. The ajax works, but it doesn't write to the file. All other code inside the ajax handler does execute. void handle_ajax() { ...
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4answers
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How to switch on 32A/240VAC with Arduino?

I have an air conditioner switch rated at 32A/240V AC - how do I turn this on using Arduino and Relay. I'm based in India and I am unable to find a relay switch rated higher than this. I don't want ...
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4answers
5k views

Bluetooth connection and RX ,TX

I have connected a RN-42 bluetooth (TX-D0, RX-D1, VCC-5V, GND_GND) to arduino.The problem is that when I run this code ,nothing happens it just upload to infinite or it doesn't. I am checking with ...
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1answer
245 views

How I could make a bus connection in a prototype shield?

I am a programmer but pretty new to electronics , I recently bought a prototyping shield like the picture : In my view there is no bus connections here . I have lots components need connect to solder ...
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1answer
254 views

Multiple shields on one Arduino/Linker base shield

I'm using an Arduino Uno R3 along with an Ethernet shield as well as the linker base shield for interfacing with three linker modules, light, temperature and some LEDs as I believed this would be ...
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3answers
410 views

Do I need 3 full-size arduinos to control this LED setup?

I'm sourcing the parts now for an LED persistence of vision setup on a bicycle. Two wheels with anywhere between 16-32 LED's per wheel, as well as 24 LED's mounted on the frame of the bike itself ...
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1answer
168 views

nRF2401 communication (extended vs normal)

Communicating to the antenna-less version from an extended range nRF2401 seems to produce some strange results... At a distance, the receiver seems to receive a number of values instead of one. For ...
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1answer
758 views

Highly sensitive light sensor to calculate number of times each color LED blinks

I am working on a project and got stuck on a point, and I hope somebody will guide me. I have a hardware device which has different color LEDs (green, red and yellow) and I have to calculate how many ...
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1answer
1k views

I2C_Anything String / Char Array issues

I've been working with the lovely I2C_Anything.h (thanks to the great work and support from Nick over at http://www.gammon.com.au/forum/?id=10896&reply=9#reply9).. All working great, I was using ...
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1answer
656 views

Arduino can't multiply?

I have a value I'm taking from a sensor module, which is 2500 when the sensor is facing a light source. This reads to my code and can be saved perfectly fine. When I try to find the weighted average ...
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1answer
493 views

Arduino, lcd 16x2 and UTP cable shows gibberish text?

I'm using an arduino uno, and an 16x2 LCD that is connected to the arduino uno with a 1m long UTP cable to transmit data and as well power the LCD screen. I used to test my code and my wiring with ...
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0answers
3k views

Accelerometer sensor gy-61 convert to m/s2

I have a problem calibrating my GY-61 accelerometer on an Arduino Uno to get values in m/s2. Analog-reading code: const int xPin = A5; const int yPin = A4; const int zPin = ...
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2answers
8k views

Arduino declaring class in h and cpp file Undefined Reference

I am trying to compile my project, but unfortunately get errors. I created class and separated implementation and declaration (cpp file and h file) Here they are sensor.h #ifndef SENSOR_H #...
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1answer
144 views

I don't have “Process” header

I'd like to run an application on my system after pushing a button on an Arduino shield. I've read that I need to use the runShellCommand() function, which can be accessed from a Process header. ...
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1answer
279 views

Irrecvdemo program in or remote library gives fatal error #include<WProgram.h>

Whenever I compile irrecvdemo of or remote library it gives error saying that fatal error saying no file or directory exists #include <WProgram.h> #include <IRremote.h> int RECV_PIN =...
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1answer
262 views

How to add the Wiring S board to Arduino IDE v.1.6.2?

My Arduino Uno is running out of memory to support my script (yes, I've tried several ways of optimize it already: PROGMEM, EEPROM, no Strings, and so on), so I would like to upload my script to my ...
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1answer
1k views

Read RFID Card Number in Processing over Serial

I have successfully setup up a RFID reader with Arduino Uno and EM-18 Card Reader Module. Its program for Arduino is below: int count = 0; // count = 0 char input[12]; ...
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2answers
976 views

Arduino radio communications

I have an Arduino and I am building a space satellite, just for fun. I'm not going to launch it obviously. I have built all the sensors and everything works. I was looking into communication because ...
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0answers
607 views

Arduino R3 Uno with EasyVR 3.0 Shield fails to connect to COM port

I have an Arduino Uno R3, an EasyVR 3.0 Shield (for voice recognition) Sketch 1.6.7 and Windows 7. Unfortunately I failed early on in the process of uploading the EasyVR example code to Arduino (...
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1answer
64 views

Serial problem after implementing data structures

Context I first ran a sketch (on Arduino Uno) without any custom data structure and list, so I was using a bunch of arrays, methods and other primitive variables. And it worked perfectly. My program ...
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2answers
1k views

How to make an SMS notification to my phone with Arduino Uno?

I am planning to make an SMS notification to my phone with Arduino Uno via a push of a button. I have an Arduino Uno C520A Embedded System. Is it possible to do so with this model ? If yes, which ...
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1answer
803 views

How does RXD/TXD request signal look betwen 16u2 and 328p on oscilloscope?

I have a broken Arduino Uno. The man tells that he connected power supply and USB at the same time. I got the new 16u2 (empty) chip. then asked my friend to re-solder it. He was using an air ...
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1answer
120 views

Compilling error not highlighting line in code

A newbe here. How come when I compile with an error I do not get the line or line number highlighted? I Get the errors just can't find where they are.
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1answer
567 views

Share battery pack with Arduino and DC motors

I used 6 rechargable AA batteries (total 7.2V) to power my Arduino (UNO R3) Car's two DC Motors (using L293D IC as motor driver). I used separate 9V battery to power arduino itself. But I want to ...
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1answer
313 views

Could I use metal buttons as a capacitive button for my arduino project?

Could I use something like this as a capacitive button for my arduino project? http://www.banggood.com/10pcs-25mm-Vintage-Round-Metal-Buttons-Craft-Scrapbooking-Sewing-Suit-Shirt-Button-p-1011485....
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2answers
824 views

Is Arduino uno SPI comunication can be also master and slave in the same time?

Is Arduino uno SPI comunication can be also master and slave in the same time? OR master 2 slaves in the same time? I want to recevice data from a sensor and display on OLED (all data transfer with ...
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2answers
822 views

Programming “Arduino” code to AT90S8515?

I found (from a previous life) an STK500 and a couple AT90S8515's in the recesses of my basement.. that I would like to put to use. Is there a way in which I can write "arduino code" for the 8515? ...
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1answer
129 views

Multiple sensor connection help

How would you connect multiple HC-SRO4 ultrasonic sensors to one arduino uno? As of now, I have a bunch of jumper cables, 3 u.s sensors, and one arduino uno board. How would one hook up 3 sensors? A ...

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