Electronics Questions not on EE
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3 answers

Assessing equipment damage following a lightning strike - Should I have planned more?

One of my client's sites received a direct lightning hit last week (coincidentally on Friday the 13th!). I was remote to the site, but working with someone onsite, I discovered a strange pattern of ...

0 answers

Building a Faraday cage for mobile networks that is transparent for optical wavelenghts

A friend of mine is working on an architectonic project, where she designs a Faraday cage type of open space built in parks or other public places. The initial thought is to build it from some sort of ...

1 answer

Unnecessary ASM code

I'm preparing to optimize some code for cortex-m4 (educationally only) so I write simple inline function like this: inline int8_t recalculate_val(uint16_t ADC_val){ int16_t value; value += ...

1 answers | 1 hour ago by PatLas_work on Stack Overflow stackoverflow.com
1 answer

Xbee wireless communication from Computer to Arduino - RSSI led

I'm trying to set up a wireless communication between a Computer (coordinator) and a Arduino Mega (router) using two xbees. Here is the Coordinator configuration: ZIGBEE COORDINATOR AT Serial ...

1 answers | 2 hours ago by narutov6 on Stack Overflow stackoverflow.com
1 answer

Arm 7 If/Else Statement

How do I convert this example of psuedo code to Arm 7?? if R8 == 1, Go to "method 1" else, Go to "method 2" Also in "method 1" R8 is changed to two (R8=2), so the next time around I want it to ...

1 answers | 3 hours ago by Taylor Austin on Stack Overflow stackoverflow.com
1 answer

gstreamer video at 720p and 25/30 fps

i'm trying to stream over the network a USB webcam. I previously manage to do so at 1280x720 with 10 fps but couldn't get to 25 or 30 fps because the camera wasn't powerful enough. So i bought a new ...

0 answers

How to change device (LCD) parameters dynamically on Android Linux ARM device

I am trying to use loadable Kernel module to modify the LCD display parameters. Following is compiled code for the kernel. void set_fb_video () { platform_device_unregister(&goldfish_lcd); ...

0 answers

XBee how to discover router or end device trough API?

I'm working on a week-end project to setup a very basic angularjs web application con control xbees modules with an arduino attached to an Xbee Coordinator. Long story short, is there any way to ...

1 answer

Arduino and Android

I have a question how send data from The board To The Android Device. I reference USB_Host_Shield_2.0 example code: #define BUTTON1 2 void init_buttons() { pinMode(BUTTON1, INPUT); // ...

1 answers | 5 hours ago by low on Stack Overflow stackoverflow.com
0 answers

buildroot fails with an older kernel release due to warnings being treated as errors

I've started to use buildroot to create a complete embedded environment. Since I'd like to simulate the running of the mpc8544ds board from freescale, I used the qemu_ppc_mpc8544ds_defconfig defconfig ...

0 answers

Packing android and linux firmware

Succesfull building linux kernel and android resource. Then, when I packing the firmware for creating a sd card image I got that warnings No such file or directory. Why couldnt created this file ...

0 answers

linux driver Data transfer with DMA from userspace

Hi I am trying to implement an FPGA accelerator to be integrated with an ARM processor by means of AXI bus. FPGA accelerator includes a DMA which aims to move input data (from memory) and output data ...

0 answers

Questions about the formula used to determine inductive reactance and $Z_t$

I am currently on the inductors unit in my Navy schooling and I have two questions about these formulas that I learned about. As I'm aware, the ability of an inductor to concentrate a magnetic field ...

0 answers

DigiSpark USB Device classes

Is it possible to change the device class to emulate audio input instead of mouse or keyboard? I want to know which file in DigisparkArduinoIntegration contains the device classes, so I could change ...

1 answer

IRremote Library causes SD Card to stop… Why?

I'm tring to use IRremote Library with the SD card library but it doesn't work, even if I just import the IRremote library, the SD card stops to work immediately anyone knows why? Here's some code ...

1 answer

Optimisation of Arduino sketch -> using for or while loops instead of switch

I created an Arduino sketch, which I use to switch on or off two sets of LEDs. The idea of the program is to run in cycles with a certain number of steps in each cycle. So far, I have written the ...

1 answer

Can magnets damage LCD screens?

My guitar teacher once told me that leaving a magnet near a LCD screen will affect it. I was skeptical because I guess that he believes that because magnets can affect CRT screens. Here are some ...

0 answers

Embedding Python in a Visual Studio 2010 C++ Project

I want to embedd Python in a Visual Studio 2010 C++ Project. #include <Python.h> int main(int argc, char *argv[]) { Py_SetProgramName(argv[0]); /* optional but recommended */ ...

2 answers

Where software hits the metal

After some years, I still feel inadequate as a programmer, since I don't have a lot of experience with low level stuff and I'm really interested in it. I got an Arduino starter kit, but still I don't ...

2 answers | 16 hours ago by D8F1F488 on Stack Overflow stackoverflow.com
1 answer

Arduino - weird terminal output

I'm trying to test NRF24L01+ module with example I've found on web. Here's my code: /* Copyright (C) 2011 J. Coliz <maniacbug@ymail.com> This program is free software; you can redistribute ...

6 answers

Why does ARM documentation recommend having only 4 function arguments? Is there a specific performance cost of having more?

Currently working with ARM embedded systems and would like to know how many arguments at max a function/method should have so that code should remain readable and efficient at the same time. ...

6 answers | 20 hours ago by Dheeraj Kumar on Stack Overflow stackoverflow.com
2 answers

C sizeof(xx) issue… ??? USB device descriptor

I am writing USB device firmware... i have the following struct typedef typedef struct { uint8_t bLength; uint8_t bDescriptorType; uint16_t wTotalLength; uint8_t bNumInterfaces; ...

2 answers | 21 hours ago by phriendtj on Stack Overflow stackoverflow.com
1 answer

Executing a Script from Linux to a Mac

Is it possible to execute a script from a linux machine to run on a Mac, using either Python or Bash? I have a raspberry pi with an arduino, when a sensor or an even occurs from the arduino i want to ...

1 answer

Maintaining communication between Arduino and Java program

I have gotten a project in school that consists of a RC car that gets controlled over WiFi. It works just fine for a few seconds, but then it just stops the connection and tries to reconnect again. ...

1 answers | 23 hours ago by Kad on Stack Overflow stackoverflow.com
0 answers

My Seeeduino ADK doesn't recognize my Android device

I have a Moto G and a Seeeduino ADK. I noticed on the specs of moto g that: USB microUSB v2.0, USB Host while on smartphones like galaxy, or nexus 5 have: microUSB v2.0 (SlimPort), USB Host, USB ...

0 answers

Qt 4: multi-touch with Linux evdev

Does Qt 4 support touchscreen input through the evdev interface ? If so, which is the right flag at compile time ?

5 answers

Driving Beaglebone GPIO through /dev/mem

I'm trying to write a C program for blinking a LED on the Beaglebone. I know I can use the sysfs way...but I'd like to see if it is possible to get the same result mapping the physical address space ...

0 answers

Cross compiling GLIBC for my ARM SoC

I am seeing something really weird inside a chroot-ed Debian armel environment. But first, a bit of backstory... This is long, but the question is complex and any potential help depends on knowing ...

0 answers

Cross compiling GLIBC for my ARM SoC

I am seeing something really weird inside a chroot-ed Debian armel environment. But first, a bit of backstory... This is long, but the question is complex and any potential help depends on knowing ...

1 answer

Arduino serial size

I'm trying to send message to arduino via usb cable with python. #!python3 import serial import time import api import sys api = api.API() arduino = serial.Serial('COM3', 115200, timeout=.1) ...

1 answers | yesterday by Teme32 on Stack Overflow stackoverflow.com
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