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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951 views

Fried two Arduino Nano's but works when powered

It took me about 4 hours to desolder an Arduino Nano I fried and solder on the new one. I'm not exactly sure how but I shorted it somehow while trying to install the nano onto my robot. I could smell ...
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1answer
130 views

Change input reference to 1 - 5 V

I am using a sensor which delivers a 4 to 20 mA output. Converting this with a 250 Ohm resistor to ground I convert this to a 1 - 5 V output. My question how can I change the 0V reference, so I can ...
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808 views

How to connect a card reader (extracted from printer) to arduino uno

I'v got this USB/SD card/CompactFlash reader from an old DELL AIO 926 printer, it's a double sided PCB board and that's all i know about it. I tried to google it but couldn't find anything relevent, ...
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857 views

Malloc with Objects in Arduino libraries

My understanding of using dynamic memory on the arduino is that new/delete are not available, only malloc realloc and such C functions, as mentioned here: C++ & the AVR I am creating a library ...
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1answer
709 views

Why the bootloader burn on ATmega328 rather than Atmega16U2 in Arduino Uno

I have been researching about the reason why we have a second MCU in arduino UNO for a while now. finally i understood that its been use as USB to serial converter. the question that really bug me ...
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80 views

Free simulation software for arduino hardware [duplicate]

Hi there i am a beginner and trying to pair some sensors with my arduino. I am looking for some software which will allow me to test my codes in virtual machine also it should be free ...thax in ...
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3answers
245 views

Reading tiny voltage changes

I have an mpx12DP pressure sensor that I want to use to measure the depth of water in a 1m tall water tank. But it only measures up to 55mV of voltage change, which the arduino can't really detect ...
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2answers
275 views

Data Logging GPS with Arduino

I am working on a project for my final in a first year programming course at my high school. I would like to make an Arduino based data logging device that I can bring with my on the mountain biking ...
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1answer
2k views

Relationship between baud rate and the frequency of vibration read using ADXL

I am doing a project using Arduino Uno and ADXL 345. I am quite new to this and I came across this post in the link" : https://www.sparkfun.com/tutorials/240. Here, a user had posted the below ...
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2answers
1k views

Arduino UNO button LED brightness vary

I am using an Arduino UNO and I am trying to vary the brightness by steps by 0.5 volts till it gets to a max of 5.0 V using buttonA and decrease the brightness of the LED by 0.5 volts with buttonB. ...
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2answers
138 views

Sanity check with potential project. IoT with a dishwasher

So sanity check for a potential project. We have an old dishwasher at work, a GE QuietPower 3, and being a technology company, we want to connect it to our chat room to notify that the cycle is done, ...
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0answers
176 views

sim 900 sending wrong sms -“ Ü ” to mobile phone from arduino

i am having a problem while sending sms from arduino to a specific number. cell phone getting sms but every time it gets same unicode -" Ü " . plz help us //-------------------------- #include <...
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1answer
117 views

How to start Arduino programming?

I am totally new to and don't know where to start, I am interested in building new system with combination of hardware and software and every time I search how to make that embedded system it finally ...
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3answers
1k views

Tile NeoPixel NeoMatrix 8x8

As a programmer I am new and lack some knowledge in electronic and I will appreciate the help. I wish to connect 3 Adafruit NeoPixel NeoMatrix 8x8 - 64 RGB LED Pixel Matrix (https://www.adafruit.com/...
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2answers
441 views

Determining which section of code uses the most flash [duplicate]

I'm running into the 32k flash ceiling of my 328p. The code is pretty compact but I need help making it smaller. Is there an analysis tool (part of avr?) that can tell me which functions take up the ...
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1answer
34 views

print data after being plugged back into USB

I have an arduino uno powered by a battery on a buggy with a sonar distance sensor. I have a program that calculates the speed it's going, and I want to correlate speed with stopping distance. I can ...
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484 views

Control air conditioner using Arduino

I followed a couple tutorial on how to receive and send IR codes to control air conditioner the receiving part is working fine and I copied the IR data of the remote control but the problem I am ...
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1answer
1k views

Can't use base class and derived class functions

I have made two libraries and one test program.I have made my custom uart library.first i have included all functions for printing in single uart library file.but then i have made print library for ...
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2answers
228 views

Intializing Serial crashes UNO

I have a somewhat large sketch that uses the Adafruit_ssd1306(I2C) library for a 128X64 LCD. The sketch is a designed to be an alarm clock. When I upload the sketch with out initializing serial, it ...
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1answer
1k views

How to control a large number of devices with an Arduino

I'm doing some initial research on a project I have in mind. I am super new to all this Arduino stuff so taking it slow and gathering lots of info. I want to control around 1000 small linear ...
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1answer
86 views

Don't pee there! Device

I want to make a device with a sensor I can attach to the places my dog likes to mark. When sensor becomes wet I want a buzzer to make a loud noise to scare the animal and notify me I need to ...
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2answers
11k views

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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1k views

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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2answers
3k views

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
312 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
805 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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0answers
961 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
774 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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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
573 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
2k views

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
130 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
209 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
278 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
131 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
972 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
286 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
356 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
719 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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2answers
330 views

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
55 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
258 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
103 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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0answers
362 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
2k 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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