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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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How to arduino code to separate strings and integers sent from bluetooth?

How to code to separate strings and integers sent from bluetooth to control the servo and led. I send 'a' and 'b' for on / off led, while integer 1-90 to move servopos? This is my code where is the mistake? #include #include…
Rifki Arif
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Measuring Current using EmonTx / Arduino Uno

I am getting 0 values when trying to measure non invasive current using an EmonTx (https://wiki.openenergymonitor.org/index.php/EmonTx_V3.4) which is based on an Arduino Uno / ATmega328 microprocessor. I am using an example sketch from…
Dan Young
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heartbeat sensor outputs buffer data using serialport - Javascript arduino Nodejs

I am trying to show sensor data and it should so something like: 0,0 0,128 0,150 120,250 code var SerialPort = require("serialport"); var serialport = new SerialPort("COM4"); serialport.on('open', function(){ console.log('Serial Port…
Murlidhar Fichadia
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I can't print number inside an array in Arduino

I want to print value in an array (array name Array_index) which I write of variable name bit_1. But when I tried to enter inside this array, the value always show zero. Please advise me how to do a correct way in Arduino. This is my code: int…
Hong Walessuksan
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Arduino Ultrasonic Sensor pulseIn is only 3 or 4

What I am trying to do is to read the value pulseIn(ECHO, HIGH), so that I eventually can convert it to centimeters, so I know how far the ultrasonic sensor is from an object. However when I read the value printed in the Serial Monitor it is only 3…
sigrott
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How to send sensor data from Arduino UNO to MySQL database using SIM808GSM/GPRS shield

I want to send sensor(SW-420 vibration module sensor) data from Arduino UNO to mysql database using SIM808 GSM/GPRS/GPS Shield…
Saymum Sany
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Arduino Python 3 Read serial port

I am getting a temperature reading from my Arduino. The arduino also control 2 switches and goes through thermal cycles. What I want to do is record the temperature for every cycles. The computer need to know what "state" the arduino is in, i.e.,…
mooder
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Arduino Uno Coding

I'm currently trying to write a code for an Arduino Uno. I have four (4) rows of six (6) LED lights, and I am trying to get them to run by themselves on a counter. Below is my coding, but I have run into an issue where the lights turn on but will…
Ajohnson
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Data sent from Android to HC-05 Bluetooth Arduino not showing

I am creating an Android app that allows me to control a device connected to Arduino using Bluetooth, with Android 4.4.2, Arduino Uno and HC-05 Module. Right now I'm finding serious difficulties to print data in the Arduino serial (in order to…
Javier Romero.
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DHT11 is not reading Temperature and Humidity when Arduino is powered on using DC power Supply (12V)

I am facing one problem. I have code which read temperature and humidity using DHT11 sensor. I uploaded following code using Arduino via USB serial, I can read values of temp, humidity. Values are being read as long as Arduino is connected to same…
Jyoti Raj Sharma
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Arduino PWM generating

I am new on Arduino. I am trying to use the board to generate a PWM to control a IGBT switch. The following is my code. I didnt get the pulse I expected. Does anyone have idea of what's going on? Thanks int pinOut = 13; void setup() { …
Suzy.W
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How to split ECU string data on Arduino?

I have a question for splitting engine control system string data from a serial port. The communication protocol description is below. Example: To retrieve the data displayed on the LCD screen of the FADEC. If the command is RSD, then the output…
aytac
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Issue with Arduino code running Motors with H Bridge and Arduino according to the written code

So i have an issue in which when I run my code with my ultrasonic sensors, and h bridge with motors one motor spins at all times and the other spins every 6 seconds for 2 seconds but i don't know why. Any help? Here is the code: int in1 = 2; int in2…
Pravine Manivannan
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Motor rotates only one direction with L293D controller

Hello I have an RC car which has two 3v motors (one for left/right and the other one for forward/back). The left and right motor is working fine but when I try to rotate the other motor it rotates only back. I've tried the motor separately and it…
Hunor Gocz
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How to store Arduino sensor value to SQL Database

I am using Arduino UNO. I want to store arduino sensor value to SQL Database, from that Database i want to show that values which was stored in Database Table to user thorough ASP.NET Web Browser. Also I am using ethernet shield. I have found this…
Shibly Sirajee
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