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## Android & Bluetooth & Arduino

I am trying to display sensor data on my Android phone (target 4.3) received from a transmitting arduino type device. The transmission takes place via Bluetooth. I am able to connect to the arduino …

## BLE Mini iBeacon (redbearlab)

I'm want to make a simple iBeacon test where an Arduino LED lights up when an iPhone with the proper application installed is nearby. Quick question: Is this possible with the BLE Mini from ...

## Control Arduino firmata with HC-05

I'm using the johnny-five library to control an Arduino Uno running StandardFirmata. I have a HC-05 bluetooth module that I want to use to wirelessly control firmata, but have yet to get it working. …

## Send More command (Val) to Arduino?

My project is controlling LED light by using Visual basic Program made by me. I have a little problem in my project, how can I send more command to the arduino from my PC? For example, This is the …

## arduino assign values to multidimensional array

I have an arduino project which uses a 2 dimensional array to track row/column info. If I try to assign a row,column pair to a particular element I get an error: expected primary-expression before …

3 hours ago

## Arduino Uno SoftwareSerial and Serial conflict

I have a very simple setup with an Arduino Uno R3 connected to my Windows 7 x64 with Arduino 1.0.1. I have a RF receiver connected to the Arduino on the DI10 port using the SoftwareSerial library. I …

3 hours ago

## Should I be doing any casting while sending data from C to arduino over serial?

My setup: Android device =(WiFi)=> Linksys router (WRT54G) =(serial)=> Arduino Android device : using sockets IO - connects to router Linksys router : Linux sockets IO - accepts a client Arduino : …

3 hours ago

## Send long array to arduino over serial from processing

So i build an 24x16 (hight of 16, length of 24) LED matrix and am using an Arduino Uno to control it. It is only a one color matrix and i am using an array to store all of the bits of data. This is …

## Transformer: primary side & secondary side current 180 degree out of phase

I am a novice in electrical engineering. I notice that in transformer the secondary side current & current referred to as primary are 180 degree out of phase from each other. But why it is so, I …

## How can KVL & KCL be derived from Maxwell equations?

How can KVL (Kirchhoff's Voltage Law) & KCL (Kirchhoff's Current law) be derived from Maxwell equations in lumped circuits?(Lumped network : if $d$is the largest dimension of the network and ...

## How can add a resistance to elecrtical madar without reduce voltage?

How can add a resistance to electrical network without reduce voltage?

## How to choose WiFi signal strength detecting sensors

We want to create robot that will localize itself by the signals of wifi routers. Which sensors should we buy to detect strength of 3 WiFi signal? Which of following is necessary for us? ...

## Issue communicating over serial to Arduino from Matlab

Update 2: Turns out adding a pause(2) after opening the serial port was all it needed. Update: I am able to manually enter the Matlab code into the Matlab command window and it will update the LEDs …

## How to reliably send large strings via serial port to arduino

I'm trying to send a large string to Arduino as constant as possible, But whatever i try it is never reliable, On c# I have: private void OnTimedEvent(Object myObject, EventArgs myEventArgs) { …

10 hours ago

## How to have wifi connected raspberry pi control an arduino?

I have an arduino uno that needs to respond to an iOS application with the internet being the medium. My initial plan was to use a wifi shield for the arduino, but since I can't get one at this time, …

10 hours ago

## Cannot send RGB color to arduino with as3

I'm in a project using arduino uno + led RGB + flash as3 but I've a little problem to send the information in order to be processed by arduino and show the color in the led RGB, I have an example of …

11 hours ago

## Arduino does not return from serial interrupt routine correctly

My program simply does nothing in loop. I set an interrupt for serial port (USART). When data comes, yes, it works and toggles the LED. But it just does it once. Once it got into the interrupt it ...

11 hours ago

## Combination of two signals to determine the end signal sent through Simulink code

Goal I'm trying to have a second signal (caused by force applied to a sensor's surface area), once it reaches a set minimum, to determine a servo motor's position. The motor's position is otherwise …

I know it's possible to change the clock prescaler at runtime. But is there a way to set the prescaler that is used at boot on an ATMega328? I'm aware of the fuses, but those are pretty permanent. I …

14 hours ago

## Transfer data to arduino via bluetooth

I am planning to transfer data between arduino and a mobile device. Right now, I can read data from arduino in mobile device, but can't send data to the arduino board. here is the code I am using for …

20 hours ago

## Feedback on Arduino class for LED circle animations

I'm fairly new to Arduino and C++ in general, coming from a heavy Python background. The code below is functional, but my lack of C++ knowledge is keeping me from spotting any errors in style, idioms …

21 hours ago

## How can electrons move along the conductive wire? ( seems to be a paradox )

Tangential components of the electric field across an interface between two media, with no impressed magnetic current densities along the boundary of the interface, are continuous. So: \$ n \times (E_2 …

## What does the electric field caused by a charged cylinder look like?

I am talking about a cylinder with a large enough radius:length ration that it cannot just be treated as a line. I would think that the electric field lines come out the curved and flat surfaces ...

## Charge of an electric wire

If an electric current is flowing through an electric wire, can we consider that wire charged? The answer is required with a proof. Can we consider the wire to be charged positively or negatively?

21 hours ago

## Regular ADK board vs Uno+USB Host Shield

Can anyone explain what advantages if any, there is in using a regular ADK board (Mega ADK or similar) vs using say, a Uno+ a USB host hsield? I'm concerned about the form factor of the former.

22 hours ago

## Why do power lines buzz more when it is low-humidity outside?

I have observed that the power lines buzz louder when there is less moisture in the air. Why is this? If it will help the lines are located on the foot hills of a nearby mountain.

23 hours ago

## How to use a low level language with Arduino

My problem is that Arduino's IDE is not enough for me lately. To briefly explain; I need to use interrupt when a data is available on serial port. But arduino IDE does not have that ability. It just …

yesterday

## Arduino at 5V but 8MHz

Is there any reason not to load the Arduino Pro 8Mhz bootloader onto a 5V arduino (custom design, just a standard ATMega328p)? I'm doing some battery backup stuff with it that doesn't play nice with …

yesterday