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Questions tagged [arduino-uno]

The Arduino Uno is a microcontroller board based on the ATmega328 and created by Massimo Banzi.

The Arduino Uno is a microcontroller board based on the ATmega328 and created by Massimo Banzi. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.

Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.

Revision 3 of the board has the following new features:

  • 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
  • Stronger RESET circuit.
  • Atmega 16U2 replace the 8U2.

"Uno" means one in Italian and is named to mark the upcoming release of Arduino 1.0. The Uno and version 1.0 will be the reference versions of Arduino, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform; for a comparison with previous versions, see the index of Arduino boards.

Quick summary

Microcontroller               ATmega328
Operating Voltage             5V
Input Voltage (recommended)   7-12V
Input Voltage (limits)        6-20V
Digital I/O Pins             14 (of which 6 provide PWM output)
Analog Input Pins             6
DC Current per I/O Pin       40 mA
DC Current for 3.3V Pin      50 mA
Flash Memory                 32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM                          2 KB (ATmega328)
EEPROM                        1 KB (ATmega328)
Clock Speed                  16 MHz

Detailed specifications: http://arduino.cc/en/Main/arduinoBoardUno#.Uyqh84X-tqc

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Use Arduino for reading accelerometer data & save to raspi

I want to use Arduino to read data from ADXL345 accelerometer and use raspberry pi with Processing to save the data into a txt file in pi. I used the code from…
user3275148
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Arduino-uno project

I'm currently working with an Raspberry Pi for a exercise. I'm working with the following on the breadboard: 5 LED's 2 Switches My following code is supposed to work as follows: With the first button you can select the next LED and with the…
DiceOfDoom
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No output from Python. Connected to Arduino

May I please know why there is no output on screen for this source code.Also please tell me why and how I can Fix it. The project is based on this Source Code. AutoRCCar on GitHub I have flashed my Arduino Uno with this code // assign pin…
Carl Mccarry
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Servo motors not working when called upon using I2C

So I'm using this movement() function inside the slave Arduino Uno, which basically handles two stepper motors and one servo motors, when I call this function through the serial read of the Arduino Uno it works perfectly, both the steppers and the…
Aimal Azmi
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Controlling Servo Motor based on Characters

I've been making a simple Arduino program which involves Slave-Master I2C communication between 2 Arduino UNOs. The Master Arduino has a Servo Motor attached to it, and the slave returns a request for 6 bytes by returning a message with six bytes. I…
Mark
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Arduino Combination Button?

I am trying to set up an Arduino Uno plus a RelayShield along with 6 push buttons(standard), and 3 LED's(red, yellow, green). Now what I have code to do is to take in a button push combination that is 6 pushes long(order only matters for what is set…
Skrubb
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Sending data from google drive to SMS

i manage to send my temperature sensor data to Google Drive by using Arduino. I am currently stuck in sending message from arduino when my sensor hits a predefined value. I am able to send SMS from Google Drive by using Twilio and some codes to the…
Hzrhsani
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I am having trouble connecting my Arduino Uno R3 to my Macbook

I have selected the correct board and port, but am getting the same error each time I try to upload a simple blink program to the board: avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync:…
poopnugget
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how to connect arduino ethernet to internet using my laptop's wifi connection

This is the image of ipconfig from cmd.
Mreno sert
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How to change com port to com5 automatically in c# (for Arduino Uno)

I am able to check com ports with my program written in c#. As you know when you make a connection between pc and Arduino it arranges specific COM port for it like: Arduino Uno(com6). But I would like to specify COM port for arduino to com5…
Xspacex
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Sending data from coordinator XBee(API) to router XBee(AT)

I've been trying to send data from coordinator XBee to Xbee in router AT mode. It works. However there is too much delay at an unacceptable duration. How to solve the delay problem? int led = 0; int ledX = 13; int pin = 5; int bs; String…
Muhammad
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I not able to connect to ibm bluemix

This is the code that has been used. The IP that is used is on the same WiFi network to which my laptop is connected. Only the last digit is different. #include #include #include byte mac[] = { 0x12, 0xED, 0xBA,…
Mreno sert
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Arduino. How to create long char array/string? Need to make http request

The problem is that Arduino (ATmega328p) limits string length. I need to generate request: (char array) to send to the SIM900 library. "GET…
user2455079
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Does Arduino Uno/OSEPP Uno have enough memory to create a servo array?

I'm pretty bad at coding (I know the basics), and I'm trying to create an array of servos in Arduino to control via Serial with Processing. I vaguely remember something about Arduino microcontrollers having really limited memory, so I'm not sure if…
Jason Chen
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error opening serial port busy proseccing/arduino-servo

Hello i have this processing sketch for my thesis project to move a servo left or right with Emotiv Epoc(Actually I want to send keystrokes r or l). The first goal is to identify automatically the port. I get an opening serial port busy error…
dimitris angelakis
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