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Armazenar mensagem SMS em variável

Estou com problemas para salvar uma mensagem SMS em uma variável. A ideia é mandar um SMS com um comando e mais tarde usar um operador condicional para ativar ou desativar um relé. Mas não consigo …

0 answers

VirtualWire - Send Integer Array

how can I send and receive array of integers in Arduino using VirtualLibrary. I declared array like this: int toSend[] = {1,4,5,7,9}; How to correctly send and receive it? Maybe someone can help …

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How can a fruit be used as a battery cell?

Fresh fruits can be used as batteries for glowing bulbs, but how this is possible? I mean how can electric charges flow through fruits? Do they contain chemicals like cells?

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How to amplify the signal of a TCRT5000 phototransistor

I'm trying to read the IR signal from my Itron C1S Power meter. It has an emitter that lights up for 10 ms every Wh of consumption. This question is based on my prior question: Use a photoresistor …

1 answer

Voltage across an inductor contradicts Lenz's law?

Imagine a simple circuit consisting of an alternating current source connected to an inductor. Assume they are connected in the following fashion: AC source - terminal A - Inductor - terminal B - AC …

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Can I control a 12V motor from arduino using an H-bridge?

I want to control my 12 volt geared DC motor from my Arduino Uno. I want it to be able to rotate both directions as I'm intending to use it for a robot. Can I use the L293NE H-bridge in this case? …

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Bluetooth RN41 does not respond

I want to send some commands to my RN41 Bluetooth Module connecting to Arduino Leonardo over the serial port using serial monitor, as the tutorial shows. But it does not respond. I can connect to the …

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MOSFET on Arduino Uno

What is wrong with this circuit? I've performed the following tests in my circuit: When I set the controller output pin PD7 to HIGH, the source/drain voltage is 0V (measured with oscilloscope). …

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Atmel ASM not working when enabling call

I am a student applied computer science, at the end of the year we had an assignment to create the hardware for an dice and program it in assembly. The hardware consist of 2 buttons and 7 leds, the …

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Why is the IOIOActivity working fine as a main but not working properly as a child?

I am currently trying to build a link between an android smartphone and a satellite on board computer using I2C. To do that, I use the IOIO board to send Serial data to an Arduino UNO which transforms …

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Stepper motor controlled by C#

I'm having trouble with my stepper motor. I wrote arduino code and it works when commands are sent from a serial terminal or tera term. When I press "R" stepper motor rotates continuously, when I ...

1 answers | 13 hours ago by user3654268 on Stack Overflow stackoverflow.com
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Convert “AA” to 0xaa in arduino

I need to convert a string like :"AA99BB67" to char[]={0xaa,0x99,0xbb,0x67}.How can I do that?

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How can a portable 5V battery charge another 5V battery?

For a device that is portable and can charge an iPhone 4 or Nintendo 3DS: http://www.amazon.com/New-Trent-iCruiser-IMP1000-Blackberry/dp/B003ZBZ64Q I wonder, if this device outputs 5V, and iPhone or …

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Call Arduino method from Android and read the binary response

I'm trying to make an Android Application which can request something from an Arduino and read the response. The Arduino has already a sketch preloaded with methods like void logGPSData() in a ...

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Need explanation on how to flash HEX files on ATmega32u4 via AVR109 protocol

I am not an electronic expert, so forgive me if I am misusing the terms in my question or if my question contains imprecisions and/or misinterpretation on how a Leonardo Board works. Corrections are …

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Reading varying sized string from serial port

I am reading in a string in C# from an arduino over serial communication. I was using ReadLine() to set a string to the incoming data. However, I noticed that ReadLine() slows down my data reception …

1 answers | 19 hours ago by C Raber on Stack Overflow stackoverflow.com
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send String from java to arduino simple example

I'm new to arduino and java, but i made a program so simple that I dont get why isn't working. I send a String to the serial port that correspond to arduino(COM5): import java.io.*; import ...

4 answers

Arduino: using Serial and Software Serial with bluetooth module

my purpose is to use Arduino to set up a communication between PC and an Android device using a HC-05 bluetooth module. I use the USB communication between PC and Arduino (Serial Monitor) and a ...

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C# console application talking to Arduino via Bluetooth

Not a whole lot to say here other than this doesn't work, and I have no idea why. The serial output on the Arduino is nothing. The output on the C# code goes down to waiting for a response and then …

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Self-made Arduino pushbutton bank not working

So I'm trying to make a 5 key keypad like circuit, but with increased tactile feel, so I forwent actual store bought pushbuttons. I rigged up keys with some aluminum foil and pieces of plastic and ...

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Specific differential equation in RLC circuit

I have been studying differential equations in RLC circuits: (a generator with fixed EMF $=E$,a capacitor $C$, an inductor with inductance $L$ and internal resistance $r$, and a separate resistor ...

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Arduino UNO + Ethernet Shield + Ultrasonic Sensor = Fail

With my Arduino Uno I measure the distance using HC-SR04 ultrasonic sensor with no problems at all using the wiring below. When I attach ethernet shield, my ultrasonic sensor does not measure distance …

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Creating a 8mhz external signal on Arduino Due

I am attempting to interface a OV7670 camera to an Arduino Due. I am fairly new to this although have been programming for many years. I need to generate a clock signal for the camera at a minimum …

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Arduino Due output TIOA and TIOB without interrupts

I am an electrical student and want to use arduino due to generate pulses for driving MOSFETs. I am making a inverter and want to generate pulses. I have arduino due with me. My main aims are : 1) …

1 answers | yesterday by Janakiram on Stack Overflow stackoverflow.com
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Data format to use on a micro controller and MQTT

I'm using MQTT on an Arduino to send sensors data to a Javascript page. Until now I've sent only simple data format: int or floats. What format can I use to send more complex, structured data? for …

4 answers

C++: is conditional inheritance possible

I'm working on a micro-processor(Arduino) project. My library Foo is inherited from a existing library Basic. Later I extended the functionalities of Basic, into another class Advanced. However, ...

4 answers | yesterday by Xun Yang on Stack Overflow stackoverflow.com
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Pi vs Arduino for running a weather display

I just moved in to my new home of Purdue and am wondering whether I should be using a Raspberry Pi or Arduino for my first project here. I want to mount some LCD panels to the back of my dorm door ...

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Is it ok to power an Arduino Duemilanove with 15 V?

The documentation says 12V is the max tension recommended to power a Arduino Duemilanove, however the "limit" is 20V (see: http://www.arduino.cc/en/Main/ArduinoBoardDuemilanove). Will the Arduino ...

1 answer

Testing my model for hybrid scheduling in Embedded Systems

I am working on a project for school, where I have to analyze the performances of a few fixed-priority servers algorithms (polling server, deferrable server, priority exchange) using a simulator in …

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Secure Arduino over internet

I am trying to create a system for controlling my home appliances using arduino over internet. Arduino Uno will act as a web server and recieve the commands from remote browser. In doing to I am not …

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