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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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Arduino circuit turns on LED but not servo

I have a project where I have a button on a breadboard which activates a servo via a programmed Arduino. Currently, this is my code: #include Servo sA; int d=2; // to store on or off value void setup(){ sA.attach(A0); …
mkpappu
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AT Commands fail to Execute in a program

The Program is shown below: #include SoftwareSerial gprsSerial(7, 8); byte sensorInterrupt = 0; // 0 = digital pin 2 byte sensorPin = 2; // The hall-effect flow sensor outputs approximately 4.5 pulses per second per //…
Viral Parmar
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Sensor reading communication via bluetooth

I have two bluetooth modules(HC05) connected to separate arduinos. One acting as master and other as slave. One LDR is connected to the slave part which will be taking continuous readings and sending it to master via bluetooth. The modules are…
Vishruth Kumar
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Communicating with SQL Database with Arduino and Tracking Shield Sim900A

Since Last many days I am trying to Send the Data to SQL Data base via GPRS. I tried doing many program, like using AT commands, but none works. I am using Aurdino Uno R3 and Tracking Shield sim 900A from Rhydolabz
Viral Parmar
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"No Socket Available" - Wifi Shield on Arduino

I have an LDR/Photocell which sends a value 1 or 0 (depending on the value) to a text file on my web address. The code works for a few seconds then prints out No Socket available. Any help will be appreciated; code below. #include #include…
Manav Gupta
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How to obtain a more accurate value for RPM

I am trying to build a rev counter using a Hall effect sensor and an Arduino Uno. I'm using Arduino software and I have wrote the following code: #include int sensorPin = 2; // hall effect float revs; float rpm; volatile byte…
c_user
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Programming ATmega328p with Arduino Uno

I'm new to Arduino, and spent a solid few hours last night attempting to program an ATmega328p with bootloader using Arduino as ISP, which I never got to work. Eventually I just took the existing chip out of the UNO, put in the other one and…
Chris Moore
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arduino code running on loop

I have used a switch case in my Arduino project and also I have used a for loop on my second case, but the function is not getting out of the for loop. I want to run my second case only for 5sec then wants to break it. Help me with that. int…
Ravi
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blinking all led at a time in arduino uno

** i want to turn on all 3 led'd at once then wait for sometimes(10 or 20 seceonds whatever) and then go off all 3 led;'s at a time ** here is my code: // the setup function runs once when you press reset or power the board void setup() { //…
Rashed Sami
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storing serial value after the loop is done from the Arduino side

I have similar question with the link below. How to store value in list (python) which is coming from arduino serially? For his output will look like [2.00] [2.00,2.64] [2.00,2.64,3.28] etc So I wonder how will be able to use [2.00,2.64,3.28]…
Greg
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LED strip not working

we are still having trouble with our LED strip. We fixed the library issue, and are now trying to program the LED's but have run into a few issues. 1) First of all, our LED strip does not consistently light up. We are using a 12v battery and…
Mikeb
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Wrong previous value when reading from Arduino

I'm using QT to read value from a photo-resistor connected to the Arduino board, I successfully read the value and emit it, as the following: void Dialog::handleReadyRead(){ QString temp; temp = serial.readAll(); …
Ruofan Liu
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Serial data changes when using Arduino Pro Trinket vs. Uno

I'm noticing my data is not changing with an Arduino Pro Trinket. The data is being sent from a spectrometer. More light= higher numbers. The code I am using works fine with an Arduino Uno (same number of values coming in, but with a range going…
keakins13
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C++/Arduino 7digit doesn't show the 5 or 6

My problem is simple but I can't seem to fix it. I'm trying to get the basic numbers on my 7 digit display (0-9). I'm doing this using Binary code for the output. But somehow my display displays a 9 while it's actually the 5 that needs to be shown.…
Thijs
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if statement in while loop arduino

code dose not perfect work int pushButton = 2; int gearstatus = 0 ; int buttonState; void setup() { Serial.begin(9600); pinMode(pushButton, INPUT); } void gearfunction(){ buttonState = digitalRead(pushButton); while(gearstatus <=…
Ravina Jasani
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