Electronics Jobs

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Hourly - Expert ($$$) - Est. Time: Less than 1 month, Less than 10 hrs/week - Posted
We are looking to develop a system to read animal tags from long range (50cm). We are looking for someone with experience with low frequency RFID to help to develop the system. We are looking to keep the cost of hardware as low as possible. Please get in touch if you think you could help. Thankyou.
Skills: Electronic Design Electrical engineering RFID
Fixed-Price - Intermediate ($$) - Est. Budget: $40 - Posted
We are using the following module: https://www.amazon.com/gp/product/B00BYRJXGA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 This module accepts 36v from a regulated power supply and turns it into a variable voltage power line for a resistive heating element. We want to replace the module with through hole components on our own board. Working output voltage will be from 3.0 up to 5.0 volts with maximum of 10A currnet. Deliverables include BOM with Digikey/Mouser part numbers, schematic & wiring diagram, and answering any questions along the way. Payment will be released after parts are received and tested on a breadboard (2-3 working days).
Skills: Electronic Design Circuit Design Electrical engineering Electronics
Fixed-Price - Intermediate ($$) - Est. Budget: $20 - Posted
We are using the following module: https://www.amazon.com/gp/product/B00SY37S00/ref=oh_aui_detailpage_o02_s02?ie=UTF8&psc=1 It accepts 36v from a regulated power supply and turns it into a 12v power line for a solenoid valve. We want to replace the module with through hole components on our own board. Deliverables include BOM with Digikey/Mouser part numbers, schematic & wiring diagram, and answering any questions along the way. Payment will be released after parts are received and tested on a breadboard (2-3 working days).
Skills: Electronic Design Circuit Design Electrical engineering Electronics
Hourly - Intermediate ($$) - Est. Time: 1 to 3 months, 30+ hrs/week - Posted
We are designing some remote wireless sensor devices for various markets including consumer and business customers. These sensors could monitor a variety of inputs including temperature, humidity, motion, AC current, water flow. The sensors will provide Web feedback and or remote control to customers by E-mail, text messages, web pages and Smart Phone Apps. The sensors may also switch off and on local devices such as lights, pumps or dry contact switches. We are looking for suggestions for hardware devices to provide the Client end and also programming both the devices and the customer interface side ie: Web page, Text messages, smart phone Apps. Please provide your your suggested hardware recommendations and quote your time to build a working prototype and a customer interface. Follow on work will depend on the success for the 1st working prototype.
Skills: Electronics Circuit Design Embedded C Web design
Hourly - Intermediate ($$) - Est. Time: Less than 1 week, Less than 10 hrs/week - Posted
I am looking to power several devices using one power source rather than one power adapter per device (which in case of digital cameras seems to be the only option). I need a schematic so I can build a PCB which would allow me to plug in several (e.g. up to 6) devices at once but making sure I don't blow up anything if not all outputs are used (like my current setup, which obviously failed). Possible specs are 6 outputs of 8VDC @ 2A each, protected against over-voltage and over-current to protect camera equipment. Current cameras I'm using are Nikon D3300, in case you need to look up existing power supplies or battery solutions. Also perhaps Nikon D810. Depending on the complexity I may also have you design the PCB.
Skills: Electronics Circuit Design PCB Design
Hourly - Intermediate ($$) - Est. Time: Less than 1 month, 10-30 hrs/week - Posted
In short, a robotic tennis partner. A robotically propelled mobile cart that moves along the court's baseline. It uses a distance/location sensor to see where an incoming ball is headed and intercepts it along the baseline (1 axis). A net atop the cart would catch the ball. Assuming it all works and the cart can move fast enough, etc., a next step/version would be to add a ball machine to the cart. As the ball approaches, another (recently caught) ball would be sent back over the net to the human player, and so on. It would be a like real-life pong game. I have some ideas for the cart/platform design I'd share with you. This could be broken into several steps. First, a POC: perhaps that a little pre-made robot car with the right sensor can track a tennis ball and move toward it as envisioned (or at least a sensor-based simulation). Next and most importantly, scale up the cart by size and weight and validate it can do the job. Finally, the ball machine would be added. The tangible short term goal is to have you produce a 4ft x 2ft platform-on-wheels that can move about 12 ft in either direction in response to an incoming tennis ball and intercept about 90% of them.
Skills: Electronics Hardware Prototyping Mechanical Engineering Robotics
Fixed-Price - Intermediate ($$) - Est. Budget: $750 - Posted
I need a Ethernet to IR with 240v relay pcb board design alone with software. The board is to be able to have two web login area, 1. to load the ir database to ethernet commands. the ir will only be to transmit. so when a ethernet command is received corresponding ir command is issued depending on the database. 2. the be able to change the ip address setting for the board. The relay will have a separate ethernet command to turn on and off a 240v device. I wan the board to be expandable to have multiple independent ir output and RS232 outputs for the future
Skills: Electronics Embedded Systems Microcontroller Programming PCB Design
Hourly - Intermediate ($$) - 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
Fixed-Price - Intermediate ($$) - Est. Budget: $500 - Posted
Hello, I am working on a new type of interactive toy that records 5-10 seconds of audio (ex. human speech) and then sings the recorded back in a variety of musical styles (rap, jazz. etc.). The toy must also be able to add random words and phrases to the pre-recorded text, such as "cool", "I love it", etc. Previous experience in circuit design, software & hardware to record and process sound is required. Contact me for more details.
Skills: Electronic Design Audio Engineering Circuit Design Embedded Systems