Usb Electronics Jobs

9 were found based on your criteria {{ paging.total|number:0 }} were found based on your criteria

show all
  • Hourly ({{ jobTypeController.getFacetCount("0")|number:0}})
  • Fixed Price ({{ jobTypeController.getFacetCount("1")|number:0}})
Hourly - Intermediate ($$) - Est. Time: Less than 1 week, 10-30 hrs/week - Posted
We have a script that connects a Web Call to USB device. The main scenario is, we have a tablet application, which is on WiFi, It sends a URL call via local Wifi to some Lighting Hardware connected via USB to a RaspberryPi, which is running Apache/PHP etc. So from a browser you can type: http://192.168.0.3/serial/model.php?communication_board_command=chr(2).chr(0).chr(0).chr(0).chr(2).chr(5) It will go to the script, and send a message to the USB device. The issue is, that when we send many of these URL calls, once in a while it freezes randomly with no apparent pattern, it seems the USB port or connection is left open or something, that does not allow the next call in. Then it will start working again after a next call. So, we want to remove any chance of this freeze. The simple PHP code we are using is: <?php if($_GET['communication_board_command']){​ ini_set('display_errors', 1); $codes = explode(",",$_GET['communication_board_command']); foreach( $codes as $code){​ eval("\$code = $code;"); echo "\n lighting-code-sent"; echo $code; file_put_contents("/dev/ttyUSB0", $code); file_put_contents("/dev/ttyUSB1", $code); }​ echo "\n php-ok1"; }​ ?> So this works fine, and a command is sent to the USB, and the lighting board connected lights. However, sometimes it does not, and the call is ignored, or it stays lit with the old code sent when a new one is sent. We have tried sending the code twice, or with a usleep delay, or via calling a redirected script twice. We have tried with fopen(), fwrite(), fclose(); But it has no effect... sometimes there is still a Pause. --- If we run the same script on Windows, WAMP setup, it works fine, it does not seem to have the delay as on Linux / RaspberryPi, The script on Windows is: <?php error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED); if($_GET['lcode']){​ ini_set('display_errors', 1); `mode com3: BAUD=38400 PARITY=N data=8 stop=1 xon=off`; $codes = explode(",",$_GET['lcode']); foreach( $codes as $code){​ eval("\$code = $code;"); echo "\n lighting-code-sent"; echo $code; file_put_contents(com3, $code); }​ }​ echo "\n php-ok"; ?> As above we can set the Baud, Parity etc. But on Linux, it does not seem like this is done, when trying the same code. Or its set somewhere else previously? And it calls the COM port, via USB/Serial drivers. It just seems on windows, the socket call is dealt with differently, and the issue will not happen. --- In anycase we need help with this code on Raspberry Pi, to have the Web Call sent but not have any Freezes / Pauses, so that the USB call, is opened and closed, and can have multiple calls in a regular frequency, as per any local web call. - Another issue is when we plug in the USB cannot be sure if it will go to /dev/ttyUSB0 or /dev/ttyUSB1 which is why have them both there, or if the USB is taken out, sometimes its lost if reconnected... so another task is to always get the USB to ttyUSB0 and allow the script to call it. So for now we need help with these 2 points, and there might be others, as the projects progresses, as we need to create a very stable system for these Web Calls. As above its currently done in PHP, but I dont mind using Python to do it, or other scripts / executables, but we do need to have full understanding and control of whats happening. Can be Pay by the hour or a fixed price.
Skills: USB Electronics Bash shell scripting Debian OS Linux System Administration
Hourly - Expert ($$$) - Est. Time: Less than 1 week, 10-30 hrs/week - Posted
Need an engineer to write the C code in Keil uVision 5 which will be uploaded to CY7C68013A via Cypress SuiteUSB 3.4 - USB Development tools for Visual Studio on the USB port. The code should compile in Keil uVision 5 without any errors so that the .hex is generated which will be used by the Cypress SuiteUSB. I have been able to run a basic code which toggles an IO pin via this method. The C code I require should use the External Bus of CY7C68013A which is available only on the 128 pin variant. The code be capable of sending and receiving data from the 8 bit data bus for a given 16 bit address on the address bus within the specified range of addresses meant for accessing external data.
Skills: USB Electronics C Embedded C Embedded Systems
Fixed-Price - Intermediate ($$) - Est. Budget: $150 - Posted
Create a schematic and PCB design (include layout, BRD, and BOM library files) for a multi-chamber ultrasonic piezoelectric atomizer controlled by an particle photon microcontroller. The system is comprised of 5 separate chambers, filled with a fluid, at the bottom of the chamber is a ultrasonic vibrating mesh atomizing disc that is actuated by a ring piezoelectric. There is one atomizing disc per chamber. At the end of the chambers there is a fan that pushes the atomized fluid into the air. The fan is to be controlled by PWM on the photon microcontroller. Each piezoelectric disc is to be controlled by the photon particle microcontroller. https://www.particle.io/products/hardware/photon-wifi-dev-kit Please either use the p1 or photon breadboard in your designs. For control, each individual piezoelectric disc should be able to turn on and off within 1 second. LED indicators for status of the atomizer shall be implemented, along with micro-usb connectors, power, and reset switches. Piezoelectric Driver KS-W16-142K is currently being used. Please see attached datasheet for details. Photograph of current piezoelectric driver which only supports one piezoelectric drive is attached. Major components on current driver board. MC20P4308S - Magicore MCU 78L05 - IC PKG SS14 - Diode Fairchild 3S16 FQD 2N60C - Transistor MC34063 YD1218 - Step-up/down/inverting switching regulator
Skills: USB Electronics Analog Electronics Digital Electronics Electrical engineering
Hourly - Intermediate ($$) - Est. Time: 3 to 6 months, 30+ hrs/week - Posted
Requirements: 1. Must have fully developed a Native Mac desktop application before; Must be able to show examples of their work 2. Needs to be able to integrate standard 3D /openTK style implementations 3. Needs to have experience with USB device communication MUST: -Applicants must submit an example application you made to qualify. -Must have solid skills in creating native desktop applications for Mac OSX.
Skills: USB Electronics Desktop Applications iOS Development Mac OS App Development
Fixed-Price - Expert ($$$) - Est. Budget: $250 - Posted
Hi, I am looking for a way to create a High Definition 3D video stream through the raspberry Pi 3. I have a 4 megapixel image sensor that runs on usb 3.0 but It does not seem the PI is capable of running the cam at the speeds necessary to maintain a minimum of 1920x1080p at 30fps. My next thought would be to use the new Picam, which has the minimum specs required, and create a program that will run 2 Raspberry Pi's side by side to stream each camera into one video source creating the 3D image. Is this possible?
Skills: USB Electronics Arduino Electrical Drawing Electrical engineering
Hourly - Intermediate ($$) - Est. Time: Less than 1 month, 10-30 hrs/week - Posted
Looking for a product designer to design a phone powerbank. strong emphasis on aesthetics but also requires some electrical technical knowledge around power adaptors / induction etc.
Skills: USB Electronics 3D Design
Hourly - Intermediate ($$) - Est. Time: More than 6 months, 30+ hrs/week - Posted
We have a basic set of 3d models and final designs for our Over the ear wireless headphones we need an engineer to make the real 3d models and engineering specs so we can go to the mold stage for the headphones and then production if the candidate does well there is afull time work with our brand
Skills: USB Electronics 3D Design Digital Electronics Electronic Design