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1 answer

Serial data received in wrong bits

I have an RS422 interface set up between an Arduino and a custom-built device. The device is set to transmit a 16-bit header, followed by 66 bytes of data, at a baudrate of 460,800 and at 200Hz. This ...

1 answer

unicast transmission on Xbee

I implemented connexion between Lilypad Arduino and Xbee serie 1. Now I want to send data to 2 Xbee, but I want to notify only one Xbee .I had successfully established the broadcast transmission I had ...

1 answers | 1 hour ago by user2389313 on Stack Overflow stackoverflow.com
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how to design high power LED light circuit,

I am new to electronics, want to prototype a LED light with 3 red led, 3 blue led and 3 white led. All the led are 1W high power LED. Each group of color can be controllable respectively and I want ...

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Electric flux of a closed surface, $\Psi = Q $ or $\Phi =\int\vec{E}\cdot d\vec{A}$

I have problem with the equation of electric flux. I use one book of fundamental physics and another book of electromagnetic engineering; the two of them give different equations for electric flux. ...

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Arduino-cant boot-load again?

we are so tired and would like to get help with this . We are trying to boot-load using the arduino Uno. We have an atmega 328p smd , that we are trying to bootload. We have connected all the right ...

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Arduino - button triggers twice randomly

I wrote a tiny C++ programm, that cross-compiles and runs on an Arduino Uno (atmega328p). It is a basic MIDI patch changer, which allows stepping through 32 slots, that contain program numbers ...

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How many kind of effect which generate electricity

I know there are Piezo/Pyro/Thermo/Chemo/Photoelectric I want to get a complete list of all these effects include in theory Where can I find this information?

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How to share a VCC and a GND across to multiple relays

I'm working on my first electronics/Arduino project to control two pairs of motors. Currently, the motors are controlled by a simple four-button, wired remote controller, where each button controls a ...

4 answers

Providing a linear adjustable DC voltage from PWM ( 1.5V to 3.3V)

I'm not an electrical engineer, so a simple task has me baffled for the last week or so. I am working on project where I am required to feed a blackbox device with a stable adjustable voltage. The ...

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how to use char values as signed variable

I am coding in arduino IDE, so basically C++. and I need to use a variable with only 1 byte for transmission purposes, but I need this to be signed. More specifically I need to send an int(2byte) but ...

3 answers

Does a conductor need to touch the battery terminal for electric field to be set up inside it?

I understand that an electric field is setup inside a conductor when it is connected to the terminals of a battery and that this field is caused by induced surface charges on the conductor. These ...

3 answers | 7 hours ago by shunya on Physics physics.stackexchange.com
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Android to Arduino Uno + Wi-Fi shield string communication

I am trying to make a wireless light control device (on/off/dimming) using an Arduino, an Android app, and a router. I am setting the Arduino to a static IP 192.168.1.2 using the router. I am sending ...

1 answers | 8 hours ago by Marwan Alayli on Stack Overflow stackoverflow.com
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Tegra Mesa GLES without X

I am trying to setup a Tegra 3 (Toradex Apalis T30) based system that will have an OpenGL ES based user interface on a touch screen. Unfortunately the standard Linux4Tegra kernel is seriously outdated ...

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What is the theoretical reasoning behind calculating emfs in series or parallel?

First off, I did some research on my own but the answers weren't satisfactory. The analogy of the water pump makes zero sense as I see no way how "Potential" is even comparable with "Dynamic ...

4 answers

Is this arduino motor driving circuit correct?

I got an Arduino Pro Micro and some parts to play with. I want to control a little 5v motor from an external power supply by using the Arduino to trigger a transistor. Like this: Is that at all ...

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Get Buildroot output image to target device

I have an x86 PcEngines WRAP 1.E router. It has a CF card slot (thats its hard drive) and I can communicate with it through RS232. I want to get Linux in. I chose Buildroot to do that. Everything was ...

3 answers

Electrostatic notion of voltage as it applies to circuits

I have a question that's been bothering me about electric fields, voltage, and circuit analysis. Initially, I came to understand voltage as it was taught in the context of electrostatics - through ...

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Xbee communication in api mode between two arduinos

I have two Arduino Unos, two lcds and Xbee s2. I connected two xbee s2 module to each arduino uno. I searched this implementation hard and tried it. but, it didn't work. I appreciate your help. ...

1 answer

Django based app on heroku showing error HTTP/1.1 505 HTTP Version Not Supported

I need to send some data from an arduino to an rest based web application. To test I have created an django based web application on heroku Now when I trying to send the data from arduino using GSM ...

3 answers

Parallel LED strings of different colors and Arduino

I need to use 7 strings of led, each one of a different color. I will control each string using a Arduino and the BC 337 Transistor. The string will be connected to a 12V power supply. I have read ...

2 answers

Basisc DIY bluetooth detection device

I am looking to make a simple, small device, that is picked up by a computer when turned on. Specifics: I am looking on making modified glasses that whenever an user puts them on, they are ...

2 answers

Serial data logging using Arduino and pySerial

I have a temperature sensor (LM35) interfaced with an Arduino board and my sketch is able to log values to the serial port, say /dev/ttyACM0 in Ubuntu, and I was able to install pySerial and log the ...

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Trouble Compiling EKfilter C++ Library on Arduino DUE

UPDATE: got the final error fixed by just actually replacing operator[] with this->operator[]. UPDATE 2: logic_error fixed! _P error is all that's left! (which only shows up in DUE, not UNO or other ...

1 answers | 18 hours ago by Mackie D on Stack Overflow stackoverflow.com
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Why do nuclear bomb explosions create an array of visible electric discharges in the form of lightening in the upper atmosphere?

I've seen videos on the internet, showing nuclear bomb test explosions, and there appears to be a large amount of visible lightening discharging numerous times over the development of the mushroom ...

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Thermocouple temperatures change drastically when my whole system is powered vs when just my arduino is powered

I apologize in advance if this should instead go in the Arduino stack exchange, but I feel it should be here. I'm using this thermocouple / amplifier pair with my Arduino Uno. I am trying to make my ...

1 answer

Arduino Java SerialEvent not being called

I am following a simple example found here (example one), to have an arduino connected to a Raspberry Pi and read some data from the arduino on the Pi in Java. The issue is that the SerialEvent ...

2 answers

How to shield for electromagnetic interference (DIY level)?

I am building an optical rotation encoder for my "autonomous robot" (a LED pointing to a photodiode that gets interrupted as the axis rotates). My issue is that at the voltage that I am using the ...

1 answer

Pointers in Arduino, not updating outside variable

Not sure what I'm doing wrong because aValue and bValue aren't being updated. int aValue; int bValue; void setup() { aValue = 0; bValue = 0; } void loop() { someFunc(&aValue, ...

1 answers | 19 hours ago by devwannabe on Stack Overflow stackoverflow.com
2 answers

Why is the electric field perpendicular to every point on the surface of a conductor?

I am reading Berkeley Physics Course, Volume 2 (Electricity and Magnetism by Edward M. Purcell). I am in chapter $3$, page $92$, and the book discusses conductors. The following is from the book: ...

4 answers

Why is the conductor an equipotential surface in electrostatics?

Since the electric field inside a conductor is zero that means the potential is constant inside a conductor, which means the "inside" of a conductor is an equal potential region. Why do books also ...

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