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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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How to read code from Arduino Uno to Arduino IDE? [duplicate]

we can upload a code into Arduino UNO from our computers, but how about reading code? Can we read and get C codes from compiled codes from Arduino hardwares? My second question is that will we read ...
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Arduino-uno sending email with Hotmail

I want to get emails read from a Hotmail account using an Arduino Uno. Is there a way to do it with SSL or is there a way to disable SSL? #include <SPI.h> #include <Ethernet.h> // Use ...
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How to Communicate between arduinos wirelessly?

I am doing a project where I need to send some numbers between arduinos. But it has to be wirelessly because they will be moving. How to Communicate between arduinos wirelessly? I need to send data ...
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1answer
306 views

Comparing orientation data obtained using gyroscope and accelerometer

Recently, I have been playing around with a gyroscope and accelerometer in the hopes of building a quadcopter. I have plotted some of the data the two sensors and I am noticing that the pitch from the ...
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0answers
733 views

Linear equation solver Arduino Calculator, printing wrong answer [closed]

I wrote a code in C to solve equations, but I don't know why some equations that I input into this calculator, give me wrong values, the algorithm is correct because I execute it in C and give me the ...
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897 views

EB - 4x4 Soft Keypad Driver Diagram from Makerstudio needed

I have found this interesting device wile looking for a cheap Arduino. It's a "driver" that converts a 4x4 Keyboard 8-PIN (8-IO) to a 4-Pin (2-IO) Device I would like to know if is Achieved by a ...
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1answer
735 views

Help understanding how to drive Step motors with Arduino

I am building a 2-Axis gantry system to dispense some thermal paste on boards. I was given two stepper motors in order to do so along with a gantry already built that will arrive in two weeks. So ...
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1answer
7k views

Reading values from the register of a slave

I am trying to interface MPU6050 with arduino. Found a simple code online, but having a bit of trouble in interpreting it. // MPU-6050 Short Example Sketch // By Arduino User JohnChi // August 17, ...
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0answers
174 views

How far can i go just with this starter kit?

I want to buy this kit: http://www.banggood.com/UNO-Basic-Starter-Learning-Kit-Upgrade-Version-For-Arduino-p-970714.html However, as shipping stuff from China takes like 3 months to arrive, i need to ...
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1answer
549 views

MPU6050 causing arduino not to run sketch

I have a mpu6050(which I got from here http://www.sainsmart.com/sainsmart-mpu-6050-3-axis-gyroscope-module.html) and I have connected it to special ports on a sensor shield made for the mpu6050(http://...
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2answers
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How to call a file from the arduino?

I am aware of the simplicity of the question. Nevertheless... I need to code into the arduino the execution of a file. More precisely a .exe. To put things in perspective. I have little to no ...
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0answers
128 views

Rf receiver, change timer

I need some help. I use function rx_setup() оf library VirtualWire.h which is used to transmit information wirelessly. The function use timer аnd there is conflict with any of the other libraries. ...
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2answers
205 views

PYM-1 PIR sensor current concerns

I am busy toying with some PIR sensors to detect movement etc for a nightlight for my kids. One of the sensors I ordered is the PYM-1 PIR sensor. The data sheet states the following: Operating ...
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2answers
276 views

Which Arduino Board should I start with?

I am interested in Arduino projects. I want to learn to develop my own Arduino based system. The problem is I am not sure which Adruino board must I start with. Any ideas are appreciated, I have ...
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1answer
129 views

Can we control an Arduino with voice commands?

I'm looking for some method to control an Arduino with voice commands. Could this work on this platform?
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1answer
1k views

how to make an led turn on when something gets close to an ultrasonic sensor

Hey I just started using arduino and so far can't get any help with how to write a code for an led to turn on when someone gets in range of a three pin ultrasonic sensor, and off when they are out of ...
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2answers
924 views

How to count the number of times a changing variable reaches a peak value

I am recording a varying distance with an Ultrasonic sensor and Arduino but my problem is I want to display the number of times this variable reaches peak (at an instance the value will be increasing ...
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1answer
2k views

What is the diffrence between following arduino boards and which should i buy? [closed]

Arduino UNO R3 Compatible Board ATmega328P ATmega16U2 http://www.ebay.in/itm/UNO-R3-ATmega328P-ATmega16U2-Compatible-Board-For-Arduino-with-USB-Cable-/201367107680?pt=LH_DefaultDomain_203&hash=...
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2answers
237 views

Non line of sight radio and arduino uno

I've been using a pair of arduino uno and nrf24l01 and found it wasn't really suitable due to low range when it comes to obstacles. Essentially I'd like to use it in country areas where it would ...
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2answers
350 views

Coding Debugging [closed]

This program is supposed to act as a Decimal To Binary Converter, the LeD's acting as output. The problem is that this function returns Garbage Value const int LED1 =1, LED2 =3, LED3 =5; void setup() ...
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1answer
643 views

How to communicate with arduino uno when arduino motor shield connected to arduino uno?

I'm using this Dual Motor Shield when I plug Arduino Dual Motor Shield into Aruino uno can't seen any way to communicate with Adruino uno.how can I communicate with uno ?
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analogRead-ing Potentiometer Values in void setup()

I've run into a problem while coding a speedometer meant for bicycles. The speedometer would require the diameter of the wheel in inches for maximum accuracy, so I'd like to have an adjustable (by ...
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1answer
54 views

What's wrong with my Arduino board?

When I connect the Arduino to my PC the Led "ON" lights for a second then turns OFF. I wonder if the Arduino has a fault?
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1answer
51 views

Why are LED's receiving different voltages connected to Arduino

I have four LED's all connected the exact same way to four pins via four 150OHM resistors. (ignore the sensors, they are doing nothing currently) The code is very simple in the loop: digitalWrite(...
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0answers
257 views

Problems when communicating with SD card using ethernet shield

I am using the "SD read/write" code from the Arduino IDE examples to test an ethernet shield (clone). The problem is that although a file is created no data is stored in it. When running the serial ...
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1answer
92 views

IDE to program Arduino Uno especially internal interrupt vectors

I am trying to program this Arduino Uno's Timer1 module to use its Input Capture pin to record the times of edges and store / transmit them during the Input Capture Interupt Service Routine, but I ...
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341 views

How to effectively modify a library to be able to function with Mozzi Library?

I have sketch that runs almost exactly as I would want it to. Now I am trying to add sound to it using the Mozzi Library instead of just using the tone function. This way I can avoid having to put a ...
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2answers
2k views

How to add data without pre-defining variables?

I am currently working on a RFID card reader. I need the reader to send the ID to a storage space. What I am trying to achieve is a person swipes their card, enters their name on the serial monitor, ...
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1answer
1k views

Motorcycle Battery Powering Arduino UNO

Folks I am planning to power my Arduino, which will be mounted on a motorcycle, using the motorcycle's battery. So the same battery will be starting the engine and powering other electrical ...
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0answers
784 views

Arduino Uno R3 L(yellow) led stays on and error on upload

So I recently got an Arduino Uno R3. Installed the IDE and drivers under Windows 8.1 and everything seemed to work fine and received the 'Done uploading' message when goofing around with the Blink ...
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0answers
410 views

reading from an array and writing into a servomotor

I have an Arduino Uno. I am trying to write a code that reads a command and according to that command it saves angles into an array or writes the angles of the array into a servomotor. I am facing ...
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0answers
519 views

Arduino uno RF transmitter and receiver, MYSQL

i tried to connect my arduino uno and ethernet shield with Mysql and everything works fine. Then I tried to connect the RF transmitter and receiver. I use a similar code, but i have problem with ...
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1answer
1k views

Set start time for arduino uno clock

I'm programming an arduino uno with attached screen to be a clock and have the code below. It counts up from zero the milliseconds, seconds, minutes and hours and when it hits 24 hours it starts again ...
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1answer
2k views

Incremental encoder code

can somebody tell me what`s wrong with my code, i am using it to calculate rpm using incremental encoder long counter=0; long rpm = 0, z =0; long ini_time = 0; long end_time=0; void setup(){ ...
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1answer
105 views

Change code so motion sensor prints time instead of a button

I have the code below. At the moment there is a proximity sensor that makes a speaker play happy birthday when it is set off. I also have an LCD shield attached and when one of the buttons on LCD ...
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1answer
1k views

Arduino 1.6.4 not showing any /tty/ options in Serial ports

hej guys, recently I upgraded to Arduino's 1.6.4 IDE just to find out, that I can't seem to upload anything to my board. More specifically: The 1.6.4 IDE is not giving me the option to select the /...
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2answers
297 views

DHT22 Does not update

Good evening :) I am fairily new to coding the fabulous Arduino UNO. My project right now are consisting of reading Temperature from a DHT22 (AM2302) and writing to a 4-digit 7-segment display. I ...
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0answers
491 views

Merging two codes, one for speaker one for LCD clock (Arduino Uno)

I have two different codes. The first one makes a LCD screen count the time and print it, then when one of the buttons on the LCD shield itself is pressed, it prints the time on the top line that it ...
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1answer
573 views

MQTT Arduino add quality of service

I'm making a project with MQTT Arduino, but on publish messages i read that it's not possible to publish with qos 1 and 2? It is true? If is not, how can i put qos on publish messages?
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244 views

how to make transmitter and receiver for quad copter?

I want to make a transmitter and receiver for quad copter for that I am using two arduinos(UNO and nano).I am using 4 pots for controlling the brushless motors.For that I am sending 4 integer values ...
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1answer
344 views

ATTiny to drive LEDs

I'm installing some daylight running lights in my car and I have purchased 2 LED bars, each with 8 white LEDs. They use 12V and I need to make some effect when they turn on. Like in some modern cars, ...
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0answers
937 views

Get a internal temperatura form ATMega328

I am making a circuit which takes three kinds of monitor temperature of the chip itself, in this case ATMega328 at room temperature, which is influenced by external thinks such as lasers, which will ...
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1answer
198 views

Cannot print the first number of the date with RTC module

I am using this real-time-clock module to keep track of the time for a project: http://www.dfrobot.com/wiki/index.php/Real_Time_Clock_Module_(DS1307)V1.1(SKU:DFR0151) I have hooked up the respective ...
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1answer
982 views

Problems with L293D

The motor are not rotating in the above circuit . Or rather the Voltage between the two Motor Terminal is zero. I have checked the Pin 10 & 11 and Pin 12 & 13. They are fine and produces ...
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3answers
888 views

Arduino Uno + Ethernet shield stability question

i have a climate control software which reports data back through the web browser. Everything seems to be working however I am running into an issue where 1 - after a bit it seems the page doesnt ...
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4answers
757 views

How can I run two Arduinos in sync for video generation?

I was thinking about building a video circuit that uses two Arduinos (maybe more) to generate video using NTSC and the AD725. Although, VGA might be nice if possible. Anyway, the idea is to use one ...
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1answer
363 views

How do I use the prototyping area on a SparkFun MicroSD Card shield?

I'm having trouble figuring this out. I'm using this popular shield: https://www.sparkfun.com/products/12761 There is a breadboard area in the middle of the shield. But what confuses me is the lack ...
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221 views

Issue with Embedded Coder Target for Arduino

I am using the embedded coder target for arduino following this: (http://www.mathworks.com/matlabcentral/fileexchange/30277-embedded-coder-target-for-arduino). I am having problem while running the ...
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1answer
106 views

Starting Off Low-Level Port Access

   I'm trying to teach myself some low[er] level code, but I just can't get it to work. I've tried OR-ing stuff in, AND-ing stuff in, and just straight up defining stuff, but it's not ...
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1answer
2k views

The IDE says my (brand new) Arduino UNO is on COM 1 [duplicate]

I recently bought an Arduino Uno and installed everything necessary. I tried it on both USB ports on my computer. However, the Ports menu only shows COM1. There is a line on the bottom of the IDE ...