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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526 views

7 Segment Display SET UP

I am new to Arduino. I have been trying to connect a 7 segment display (3 digits) to my Arduino and I was successful, but I am not doing any connection to ground. I do not find the data sheet so I am ...
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2answers
76 views

Keyboardmessage on Arduino UNO

Can an Arduino UNO and Arduino Leonardo do the same things? Some of the examples in the Arduino software say to use Leonardo e.g. KeyboardMessage.
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1answer
429 views

splitable jumper wires question

I just received my starter kit from oddwires.com today and it came with a split-able ribbon cable for prototyping. I was curious if it is possible to split each wire off and use only what I need to ...
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1answer
109 views

Why voltage at AREF is given by Vin * R2 / Rtotal

In chapter 4 of Arduino Workshop on page 85 (or page 31 in the pdf) it says that the voltage at AREF in the schematic is given by: Vin * R2 / (R2 + R1) However, the voltage is flowing from 5V to ...
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3answers
2k views

Arduino PWM fading led

I am trying to blink an LED with PWM on Arduino. I don't know what is wrong but my LED is not fading as expected. What is wrong? I think that I have bad registers settings, but I am not sure. LED ...
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1answer
105 views

How to program arduino for ethernet with only usb cable

I have arduino UNO r3 ATMEGA 328P board and this kind of a cable. But I want to make and test a program that need to get the data through ethernet port. Can I do only with them. I want to know whether ...
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2answers
79 views

Reading speed of different arduinos

I'm thinking about using an Arduino for one of my Projekts. This would require that the Arduino can read/write a digital input/output in the order of 100kHZ to 1MHz. Is this possible or do I have to ...
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2answers
3k views

Reading the rpm of multiple fans

I am trying to build a fan controller for my pc, the problem is that the example code(http://playground.arduino.cc/Main/ReadingRPM) im using utilizes interrupts. On my uno I can then only read the rpm ...
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1answer
330 views

Detecting ball moving between IR pair and handling ambient light changes

I plan to use the SEN-00241 IR Emitter and Detector pair to detect a ping pong ball moving fast between them. I understand I could watch for voltage changes to detect this passing object, however how ...
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3answers
3k views

Serial port /dev/cu.usbmodemfa131 vs /dev/cu.usbserial-A702NY8S

On Mac OSX Mavericks, why does Arduino Uno uses serial port named /dev/cu.usbmodemfa131 while Arduino Nano uses /dev/cu.usbserial-A702NY8S? Are they using different FTDI drivers?
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1k views

Wired serial connection between two Arduinos - do they need a common Ground (GND)?

I would like to connect two Arduinos by a serial connection. Is it sufficient to connect TX1<-->RX2 and RX1<-->TX2 or do I also need to connect the GND of the two Arduinos?
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2k views

what is the coversion details of temperature usnig lm35?

I found similar type of code in many sites for coverting analog signal lm35 to centigrade. But i can't understand that fully. So I need some help what this equation means tempC = (5.0 * tempC * 100.0)...
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1answer
520 views

How does this code work?

I've found this code below, but I can't figure out how it works. Can someone explain to me the flow of the program? #include <LiquidCrystal.h> LiquidCrystal lcd(2, 3, 10, 7, 5, 4); int mem=0; ...
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2answers
2k views

Problems controlling servos using proximity sensor

I've just started using Arduino and I need to make a code to simulate the behavior of a lizard, meaning that if you come close to it, it moves away from you. I'm using a "Arduino duemilanove" that my ...
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1answer
1k views

Calculating location with 4 piezo's

i've got the following problem i'd like to get solved and i'm breaking my head, so please help! I have a rectangle with the following size 40 cm * 50 cm. On each corner of this rectangle I placed a ...
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1answer
3k views

Setting up the MMA8452 to trigger interrupt

I am working with the MMA8452q accelerometer by Freescale. I am trying to set it up to be in low power mode, to go to sleep when no motion has happened, and to wake up due to motion being detected ...
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1answer
5k views

Problems with Dallas temperature sensor code

I have connected up my temperature sensor and I am trying to run the one wire address finder to find the address of the sensor. The problem is that when I run the code it gives me the error: 'OneWire'...
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1answer
339 views

Unable to light up all the LEDS connected to Arduino using processing

I have 3 LEDs connected to my arduino which are controlled via laptop key presses with processing. While the LEDs are able to light up when the respective buttons are pressed, i am unable to light up ...
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1answer
1k views

Reading text/strings via processing

I'm trying to control an led attached to my arduino via key presses on my laptop.When i hold down a key, the led should light up, and when i release the key, the led should turn off. While my code ...
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2answers
1k views

Arduino time(milli) and pressure sensor

I've succeeded to get an Arduino to work with a pressure sensor. What I want to do is when I put pressure on the sensor, after 5 minutes the led lights on. it starts over again if there's no ...
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1answer
8k views

Keyboard/mouse libraries with UNO [duplicate]

I have an Arduino Uno Rev. 3 and I'm trying to make it so that the Arduino can send a key press / mouse action to the computer. However, these libraries are restricted to a few other versions of the ...
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1answer
1k views

Modifying serial message for Adafruit NFC/RFID card

Using an Uno configured with an Adafruit RFID-NFC shield to send the UID values to a desktop game I am building. Works fine. However, in addition to just the UID, I need to send 1 additional value, ...
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1answer
670 views

Zigbee Relay board communication with Arduino

I have bought this wireless ZigBee relay board. I was wandering about an arduino sketch to get started, I have searched for 2 days now but with no results. What I was thinking of is to have an ...
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2answers
103 views

Processing Input

How to make an input from computer using processing (like a password form) and trigger pin in arduino? If you let some link to read more that would be very helpful.
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28 views

Weirdest behaviour with arduino and bootloaders for GPS [duplicate]

I have an EM408 GPS and an Arduino Duemilanove with an ATMega328. I have the following code to talk to the GPS and get raw data: #include <SoftwareSerial.h> SoftwareSerial GPS = SoftwareSerial(...
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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 ...
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3k views

Why does increasing resistance make a capacitive sensor more sensitive?

From the Capacitive Sensor Page on the Arduino website, it states the following: The capacitiveSensor method toggles a microcontroller send pin to a new state and then waits for the receive pin to ...
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1answer
7k views

How to use String.substring?

I have the following code in which requestLine is always empty and I can't figure out why. request contains a raw HTTP request, and I want to get the first line of the request which contains the ...
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1answer
150 views

How do I avoid this error trying to connect arduino to pc with linux fedora 20

I used Arduino successfully on my old Linux Fedora 12 system. Now I have a brand new PC with Fedora 20, and have today installed Arduino on it. In my first attempt to use it I typed Arduino as follows ...
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2answers
6k views

bootloader uploading into Atmega328

Here is mine circuit. Intially i used arduino UNO directly for programming. Now i am Using atmega 328 IC for programming. I am trying to connect 32 hall sensor via Mux circut. I wanted to How to ...
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2answers
2k views

Error while connecting Arduino to Macbook: “serial port already in use. try quitting any programs that may be using it”

I'm trying to connect to my Arduino board through a macbook pro with mac os x 10.9.3 installed. I'm following the instructions from the arduino guide and in the connection section: " Connect the ...
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3answers
1k views

Significance of the numbers used in the manual

i just bought the starter kit and am currently working my way through the examples in the book when i came across some numbers used in the manual that seems a little too specific. For example, in ...
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2answers
223 views

help with input in a Simon arduino uno game

I' making a Simon game with the arduino uno. I know something is wrong with the inputs but i don't know why or how to fix it. The problem is the program takes an input and says it is correct no ...
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1answer
3k views

Reset fuses on atmega328p using Arduino

I bought a few atmega328p chips but unfortunately they came with the Arduino bootloader and they are set to use the external clock. I want to reset their fuses using avrdude so I can use the internal ...
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2answers
479 views

Stacking shields without headers

In the project I am working on, I have a limited space with which I can work. I am using an Arduino Uno with 2 Adafruit motor shields, and when I stack them using normal, female stacking headers it is ...
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0answers
675 views

Negative value conversion for modbus slave

I have an analog sensor which reads values 0-5v, -75 degrees to 75 degrees. Now I have converted to +75 degrees and -75 degrees format depend on the voltage. From 2.5v to 5v data is read properly (i....
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1answer
936 views

Analog average sample wind speed sensor

I have wind speed sensor that can measure max speed upto 30 m/s with analog out put 0-5v. I have simple code calling from the loop. When I put the wind speed average code, the web server is not ...
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1answer
913 views

Connect to more than one Arduino with Adobe AIR

I am using the arduinconnector ANE to connect to an arduino baord in an AIR application. https://code.google.com/p/as3-arduino-connector/ Can anyone tell me if its possible to connect to more than 1 ...
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1answer
437 views

Setting time frame in Arduino Uno

I have built the circuit below using mux ICs. In a particular interval the respective selector pins get selected and analog signal from hall sensors are read and give a particular analog value out. ...
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0answers
40 views

How to communicate arduino with Matlab [duplicate]

I have been working on a project which deals with analysing data from sensors to matlab. How do i establish this communication. Please help me
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1answer
863 views

Timer1 stops firing

I am trying to use interrupts to play notes on a speaker. Timer2 works fine, but after about 15 seconds, Timer1 stops firing for about 5 seconds, and then it comes back on. If I keep running the ...
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1answer
680 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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1answer
606 views

Can a PC connect to an Arduino for serial communication without installing the entire dev kit?

I'd like to send a prototype board to a friend pre-programmed and wired. Ideally they should just need to plug in the USB and connect to it over a serial COM port. With another laptop I used for ...
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1answer
930 views

Unable to read text file from server

I saw the Web client Example , In the example, the server connection is initialized in setup(). But I want the server to update the text file every time. So, I need the server connection to be in ...
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1answer
746 views

DC-DC converter with Arduino not working

I've got a program running on the Arduino that is supposed to turn on and off a pump. currently, I am outputting the reads of the components that need to be read and it shows when the port (port 13) ...
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2answers
4k views

Use Higher Resistance Than Instructed in a Circuit

I'm following the "Get Started with Arduino" Guidebook, and I'm at the part where pulse width modulation (PWM) is discussed. The instructions say to create a simple circuit with a breadboard, red ...
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1answer
1k views

Cheapest way to connect android device to arduino wirelessly

I'm building a simple RC car which I want to control using android phone. The phone has bluetooth and Wi-Fi. My questions is what will be the cheapest way to connect the two devices at about 50-120m ...
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2answers
2k views

Convert a Bitstring into an integer value

I have got a String filled up with 0 and 1 and would like to get an Integer out of it: String bitString = ""; int Number; int tmp; bitString = ""; for (i=1;i<=10;i++) { tmp= analogRead (...
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1answer
2k views

Adafruit motor shield + Adafruit stepper not working

I have the Adafruit Motor Shield V2 and an Adafruit stepper motor. I have not soldered the shield onto the Arduino (which is an Uno) yet because I don't want to make anything permanent yet. I have the ...
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1answer
2k views

How to make XBee module interrupt/wake arduino

What I am trying to do is, to have arduino in low power mode and waking up only when a packet is received and is available to be read from the buffer. A scenario : Zigbee XBee module is not ...