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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342 views

Arduino IDE fails without sudo

I use Arduino IDE 1.6.6 on Ubuntu 15.10. Starting the Arduino IDE without using sudo fails for both: uploading the code to the Arduino Uno starting the serial monitor The group I need to add my ...
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2answers
677 views

The 3.3 volts of the USB To TTL

I'm using ESP with USB to serial converter (D-SUN) is it possible to use the 3.3 volts of the USB instead of the Arduino Uno?
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3answers
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How to convert frequency into db

I have made an Arduino circuit which outputs in terms of frequency(hz) and I need output in terms of db as well So is there any formula which can I apply to convert frequency hertz to db or is there ...
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1answer
380 views

Arduino Uno and Raspberry Pi USB Serial Communication

I am trying to get Arduino Uno with Raspberry Pi to communicate with each other. I want the python script to write a message and for my Arduino to read it. This was working before, but I came back a ...
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1answer
268 views

Message received with 1 character less

I have the following situation: One Arduino Uno with a 433mhz transmitter wired to the laptop to have serial communication. Another Arduino Uno with a 9V battery wired with a 433mhz receiver and an ...
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0answers
94 views

SPI Interface between Arduino UNO and EVK1100 [closed]

I'm using Arduino Uno board as master and AVR32UC3A0512 as slave. I've written code for arduino using SPI.h library, and Atmel Studio 6.2 using spi.h. I'm sending data from arduino to atmel i.e from ...
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1answer
587 views

Reading Analog values of bluetooth module HC 05

I am working on a project which requires signal strength of a bluetooth TX and RX. what i assume is that in bluetooth module like hc05, there is an antenna receiver which reads the analog signal and ...
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1answer
86 views

Same Arduino Sketch when uploaded from a Linux machine does not work

I am trying out some code using the Arduino IDE. The code basically tries to connect to a server and push some data to it. When I upload the sketch to the Arduino from Mac (Apple PC running on Mac OS)...
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2answers
2k views

FastLED fade WS2812B

Learning how to program with Arduino, but the learning curve is out of my league. I have this #include <FastLED.h> #define NUM_LEDS 4 #define DATA_PIN 3 CRGB leds[NUM_LEDS]...
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2answers
708 views

MPPT using preassembled 'adjustable' buck/boost IC

This is more of a thought experiment, as I don't know if I'll have the time to work on it. Items: Arduino Homebrew MPPT controller from Instructables LM2596 Adjustable Buck Regulator Idea: Looking ...
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2answers
80 views

Issue with simple project

I'm new to Arduino and today I have a problem with this code: int led_1 = 10; int led_2 = 11; int led_3 = 12; int button = 3; int time = 0; byte val = 0; void setup() { // put your setup code here,...
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1answer
349 views

Get csv field values

I am uploading data using Thingspeak and I would like to get only values stored in a field. Is there any way to get this in a cvs http request? When you call a cvs http url, you get: What I am ...
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1answer
2k views

2 Arduino Unos Connected with 1-Wire and Receiver Pin getting Stuck High

I am trying to accomplish 1-wire communication between 2 Arduinos and so I wanted to start off by having 1 Arduino toggle a digital output pin and have the other read the state of that pin. To ...
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0answers
600 views

How to read all avaiable data from a Serial stream and then stop

I am trying to read data from the Serial port in my Arduino, store it in a buffer and when all the data has been read stop reading and then start using the data (the talkMIDI() function). The Arduino ...
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2answers
3k views

Arduino Yun RFID-RC522 module not working

I have tried to use Arduino Uno with RFID-RC522 module. It is good work[1] and read rfid cards. But Arduino Yun doesn't work with RFID-RC522 module. What is diffrent Uno and Yun? 1- http://www....
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1answer
3k views

What is the correct way to wire a piezzo buzzer with a potentiometer and a button?

I'm working on a morse transmitter (kind-a), this how it looks like now: It's working, but is it correct? My piezo buzzer is 3-24V. I use the potentiometer as a volume control. The button is for ...
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1answer
235 views

Why won't processing not communicate with Arduino uno?

I downloaded the Processing language and ran the "Hello World" program to test it. The message appears in the Serial console but not on the Processing console. It prints "null" only. I am using the ...
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1answer
831 views

connecting RTC DS1307 to ethernet shield

What is the easiest way to mount DS1307 to ethernet shield? I tried to do this: https://learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit/wiring-it-up but my program just freezes when I ...
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1answer
891 views

Issue in installing Arduino unit library and running with Firmata test application

I am trying to update the Arduino library via the library manager and I tried to download it from the link given in the firmata_test program: WARNING: Category '' in library ArduinoUnit is not ...
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1answer
659 views

Arduino UNO, using 5V and 3.3V

I am newbie in Arduino (using UNO) and as I have 2 components that I wish to connected that one needs 5V and the other need the 3.3V, is it safe to connected them together next to each other?
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1answer
368 views

Script stops functioning after calling irsend() function in irlibrary!

I have the following script which checks if the user has pressed the numbers "770" or "769" continuously in the remote. The script works fine and displays all numbers. When I press the buttons "770" ...
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1answer
232 views

Failing to read from DHT22 when multiple components on breadboard [closed]

I've been trying to use DHT22 along with many other sensor components connected to breadboard. It seems to fail reading from the DHT22 when multiple components are connected and reads only when the ...
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2answers
403 views

Best way to implement score board logic using Arduino and Shift Registers?

I am from a mobile development background and very new to Arduino. I am trying to make an electronic cricket score board. The logic is simple. Score - 888 (3 Digits) - I have implemented this logic ...
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3answers
9k views

How many LED Strips can we connect to an Arduino Uno? Is there a way to connect 1-3 meters worth without needing extra parts (relays)?

I am looking at Adafruit to purchase some LED strips for a mod for my computer case, and want to power it with an Arduino. I am looking at the Uno, but the Mega looks good too. I hear the Uno is ...
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2answers
6k views

May I use both USB-serial and tx/rx pins at the same time?

I am building a CNC machine based on GRBL code on a uno. I also have found a script to read data on a N64 controller. I know there is not enough pins available to do both codes running on the same ...
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1answer
47 views

Erroneous sensor reading while connecting extra load

I'm making a speedometer using arduino. I've made use of the interrupt pins to achieve the same. My problem is with the power source. I'm using a 12 V battery supply to power the arduino and I'm also ...
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2answers
914 views

One LED being constant and another blinking

I have just started my first project. I got through with 2 periodically blinking LEDs. Now I want one LED (blue) to be lit constantly and the other (red) to be blinking as before. Can anyone help me ...
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1answer
552 views

How to interface with generic IR RGB LED controller?

I want to hook up an arduino to one of those generic RGB LED controllers, you see them everywhere, they are these little white boxes with power input and RGB strip plug and an IR LED lead. Is there a ...
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1answer
4k views

Error opening serial port '/dev/cu.Bluetooth-Modem'. (Port busy)

I’m sorry if I sound ignorant and naive, but I’m brand new to Arduino; very keen, but know very little. I started with a Sainsmart Arduino Uno clone board. I downloaded the software, which opened ...
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0answers
583 views

ESP8266 and Arduino bidirectional streaming from and to a website

I was looking for some easy tutorial on bidirectional communication via ESP8266 connected to Arduino UNO. I want to send and receive strings from and to JQuery based website. However, I couldn't find ...
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2answers
4k views

Arduino RTC - getting the time from RTC after the power is cut off

I have a new DS1307 (original, not a Chinese rip off), with a new battery. It is working great, but when I turn the Arduino off (it is currently connected to laptop) and then turn it back on, it ...
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0answers
2k views

Connection issues with TI CC3000 & Arduino Uno

I bought a CC3000 Wifi Shield from Sparkfun and attached it to Arduino Uno board. As first thing I tested the board with the board test example: SparkFun CC3000 - Board Test CC3000 ...
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2answers
254 views

Using a state machine

I'm trying to get a strip of Neopixels to circle through its length, one LED at a time, I want it to do it faster as the value received from the sensor increases #include <FastLED.h> #define ...
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0answers
934 views

Error in modification on MPU6050_DMP6

I made modifications on the original code of DMP6 MPU6050 to make it as I want. I took the standard libraries with it and they are helper_3dmath.h, MPU6050.cpp, MPU6050.h, MPU6050_6Axis_MotionApps20.h,...
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2answers
61 views

Multiple rgb control plus calculation help

Hi me and a friend is making a computer shelf with leds in the woodwork, were using a special glue for the plexiglass in the shelf which means we're using individual rgb leds, four leds for each ...
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0answers
439 views

Best 2a stepper motor driver for Arduino Uno

What is the simplest (from a user/install standpoint) 2a stepper motor driver for an Arduino Uno? I would like something simple and easy to stack like the Adafruit Motor/Stepper/Servo Shield for ...
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1answer
1k views

Measuring acceleration in g's

I am using adxl335 accelerometer with Arduino uno r3 to measure acceleration due to gravity along x axis. I am using 50 ms delay and printing to serial. I have two questions, which are; Can I ...
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1answer
3k views

SD Card shield and TCRT5000 sensor aren't working together on arduino uno

I need to work with SD card and TCRT5000 sensor (Reflective Optical Sensor with Transistor Output) and save data from sensor to file. So I select Arduino Uno and added to it a SD card shield(from LC ...
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2answers
553 views

How to correctly pack an unsigned long from 3 unsigned chars?

I would like to use 652 unsigned long values on an Arduino Uno, but it doesn't look like there's enough memory. I thought about the splitting unsigned long values to 3 unsigned chars to store in ...
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2answers
59 views

Leostick Receiving message from Uno using USB jumpers cables

I have a Arduino Uno which is looping over Serial.println("$testmessage"). Connected to this is a USB cable that i have cut and soldered male jumper leads to . I need to receive this message ("$...
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3answers
411 views

Here is my code and i keep getting this error expected primary-expression before'}' token

#include <QTRSensors.h> #define NUM_SENSORS 8 #define TIMEOUT 2500 #define EMITTER_PIN QTR_NO_EMITTER_PIN QTRSensorsRC qtrrc((unsigned char[]) {10,7,6, 5, 4, 2,16,14}, NUM_SENSORS, TIMEOUT, ...
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2answers
69 views

Looking at Adafruit's website I'm confused which wallcharger I should get

As the title says there are many different wall chargers to choose from. 12v, 9v, 5v, with different mA amounts... The starter kit on Adafruit's website mentions to get the 9V 1000mA switching power ...
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1answer
174 views

Continuous Servo not setting speed correctly

I have two continuous servos connected to my Uno, and I'm running this code on it: leftServo.write(91); rightServo.write(102); delay(3000); leftServo.write(112); rightServo.write(81); delay(3000); ...
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266 views

Sparkfun MicroSD shield cannot open log file

I'm currently trying to log data from a GPS shield onto a microSD card using a Sparkfun microSD shield. All my code will compile, but when I open the serial monitor the microSD will initialize, but ...
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2answers
3k views

How to read RC receiver channels without using pulsein() command with arduino

I am building a quad-copter, the problem is of stability and for better stability lesser sampling time is required. For lesser sampling time I need to have faster loop() function. But the Pulsein() ...
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1answer
555 views

arduino uno external power supply

I have an arduino uno which is powered by batteries. I have 6 AA-Batteries (1,5V each) connected to Vin and GND. Thats cool because I don't have any cables and works pretty good. The reason I need 6 ...
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1answer
391 views

Modifying Arduino IMU library to rely on DSSCircuit's I2C Master Library

For an Arduino project I am working on, I am trying to modify the SparkFun 6 Degrees of Freedom IMU Digital Combo Board - ITG3200/ADXL345 to support DSSCircuit's I2C Master Library (https://github.com/...
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2answers
4k views

Arduino in-built LED is not turning off

I have an Arduino Uno whose LED, which is connected to pin 13, is not turning off and it always stays on, and it annoys me. Touching any exposed pins turns off the LED after removing my hands from ...
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0answers
146 views

Using arduino shield seems to break serial.print and uploading new code?

Hello Stack Exchange Community! For an arduino project I am working on, I modify the SparkFun 6 Degrees of Freedom IMU Digital Combo Board - ITG3200/ADXL345 to support DSSCircuit's I2C Master Library ...

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