You've landed at the right place. oDesk is now Upwork. Learn about the new platform.

Electrical Engineering Jobs

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

show all
  • Hourly ({{ jobTypeController.getFacetCount("hourly") | number:0}})
  • Fixed Price ({{ jobTypeController.getFacetCount("fixed") | number:0}})
show all
only
only
only
show all
only
only
only
only
only
show all
only
only
only
Fixed-Price - Intermediate ($$) - Est. Budget: $1,000 - Posted
need someone to make a hardware device that uses nfc to pair the device to and a mobile phone via bluetooth. then the device will be put on a chair and it keeps track of how long you are sitting during the day. So here is the order. open mobile app on phone, tap phone to device to pair via bluetooth. then use phone's internet to record how long a person has been sitting during the day. for iphones it will need to connect directly via bluetooth without nfc since they haven't opened up nfc to developers yet The device can use a simple force sensitive resistor to detect if a person is sitting. you can use any type of arduino a prototype will need to be built in 1 week.
Skills: Electrical engineering Android App Development Bluetooth iOS Development
Hourly - Intermediate ($$) - Est. Time: Less than 1 week, Less than 10 hrs/week - Posted
I am looking for hire someone to design circuit board and complete solar inverter to take to manufacture to have it produced on larger scale. Inverters need to last 5 years at least. Plus i am looking to add one extra thing to the circuit board. .5 KW-25 KW design, 220v Output.
Skills: Electrical engineering Circuit Design Electrical Drawing Engineering drawing
Fixed-Price - Expert ($$$) - Est. Budget: $600 - Posted
I just wanted to clarify that the output needed to be sinusoidal. Please let me know what all would be provided with the solution. Please, find the attached file with the design requirements. Please, let me know if you need clarification on anything. If you would like to quote it in stages that would be fine. I would like it in 20 days or less, I would like you to supplying the complete tested working control and buy components, because I don’t have hardware. This project will be difficult for you if you have not developed a frequency drive before. Do you have an idea of what you would need? Have you developed a Frequency Drive or something similar before? I would like it in 20 days or sooner. I want you to supply all the material it will be great. I will send the fund into milestones based on progress. You will have to design and hardware for the VFD controlled by raspberry pi and Touch screen. The main part of the design is VFD design ok. I do not have the hardware. I am an Electrical Engineer and able to program in C/C++. I do not have the resources to develop this product so; I will need the complete solution. The main part is the VFD design and interface to a raspberry pi that will utilize a touch screen to make the output adjustments. I mentioned all the details over here for more info please, find the attached pdf file thanks.
Skills: Electrical engineering Analog Electronics Arduino Circuit Design
Fixed-Price - Intermediate ($$) - Est. Budget: $70 - Posted
Attach is the pdf file 1) Let h[n] be a finite length sequence of length N, where N is an odd integer, and symmetric around its mid-point. Let h[n] be the unit sample response of an LTI system. a) Prove that if h[n] is non-causal extending from n = -(N-1)/2 to n = (N-1)/2 then arg{|H1(ω)}, the phase spectrum of H(ω), is zero. What is the time delay through this system? b) Let h1[n] = h[n–(N-1)/2], or the causal version of h[n]. Show that |H1(ω)| = |H(ω)| and arg{|H1(ω = –αω, i.e., linear. Write the expression and plot that phase spectrum. What is the time delay through this system? 2) An N-point rectangular window is the sequence wR[n] defined as:    ≤− ≤ = elsewhere Nn nw R 0, 011, [] Derive its Fourier transform, WR(ω). Write the expression for the magnitude and phase spectra. Compute (a) the DC gain, (b) the main lobe width, (c) the side lobe widths and (d) the phase spectrum, all as functions of the window size, N. Provide results and time and frequency domain plots for N = 32. 3) An N-point Hamming sequence wH[n] is defined as: ( )[ ]    ≤− −≤− = elsewhere NnNn nw H 0, 011,/2cos46.054.0 [] π Express wH[n] as a function of wR[n], and apply Fourier transform properties to derive the expression WH(ω) as function of WR(ω). Compute (a) the d.c. gain, (b) the main lobe width, (c) the side lobe widths and (d) the phase spectrum, all as functions of the window size, N. Provide results and time and frequency domain plots for N = 32. Contrast the properties of WR(ω) and WH(ω). 4) For the 250-point audio segment (fs = 10 kHz) is provided in file ex2M1.mat compute its magnitude spectrum using both a rectangular window and a Hamming window. (a) Use windows of the same length as the audio segment. Plot the magnitude in linear and dB magnitude scales (and linear phase scale) and phase spectra. Highlight the differences between the two versions of the signal spectrum. (b) Repeat the analysis using windows with length twice that of the provided data, by appending zeros at end of audio data. (b) Repeat the analysis using windows with length twice that of the provided data, by appending zeros at beginning and end of audio data.
Skills: Electrical engineering Mathematics
Hourly - Expert ($$$) - Est. Time: Less than 1 month, 10-30 hrs/week - Posted
My team has been working on a prototype using some off the shelf parts and its time to get it designed into a PCB. While we have a little EE experience, we figured it would be much easier to have someone else handle the PCB design. Basically right now we have a prototype built from a few off the shelf parts (sparkfun stuff mostly). Our final product will basically be a stepper motor that is controlled via bluetooth LE. Right now we're using the following: https://www.sparkfun.com/products/13729 microcontroller+bluetooth LE device. https://www.sparkfun.com/products/12859 Motor driver, we're using this to drive the stepper motor (at about 1.7A, and 12V) https://www.sparkfun.com/products/10617 We're using this to read the battery charge, though I'm sure there's an easier way if we're designing our own PCB. The last part that we don't have anything for yet is a built-in lipo charger. We need 12v, so we're looking at doing a 3 lipo cells. I've done some research and it looks like there's a bunch of battery management chips from maximintegrated that would do the job. They have schematics for completing things. https://www.maximintegrated.com/en/datasheet/index.mvp/id/6207 The board would charge through a DC jack. Lastly, we would probably have a few LED's controlled from the microcontroller. Basically we're looking to combine all of this onto one board. If it makes it easier, the big easy driver board I believe is "creative commons" and has board designs you can download. If this sounds like an interesting project, please apply and we can chat more.
Skills: Electrical engineering Circuit Design PCB Design
Fixed-Price - Intermediate ($$) - Est. Budget: $100 - Posted
I’m looking for someone to provide custom Arduino code, and a step by step plan on the hardware setup. The preferred items to be used on this are: Arduino Uno Breadboard (if required) Capacitance Sensor (using Chrip! currently see note below) LED Other connections, wires, resistors, diodes, etc as described by you. Functions required: Arduino to read capacitance via sensor and provide information in Serial Monitor (currently being done with setup in place) Ability to set specific range of capacitance in code that when reached will trigger LED to turn on Ability to power capacitance sensor via Arduino, or via external power source When powered by external power source I will want the need to adjust frequency at a minimum. (see notes) What You Need to Do: Create custom or “tweaked” Arduino program to do the functions mentioned above. You can “tweak” current code if possible” Advise where and how to place the LED and how to connect it to function. Advise how to connect and manipulate power input in order to adjust frequency, etc. Make sure that all aspects connect together and function as expected, repeatedly. Advise of any limitations of designed system. Provide step-by-step instructions and explanations if required. Notes: Capacitance Sensor: I am currently using a Chirp! (http://wemakethings.net/chirp/) connected to my Ardunio Uno as a sensor only. This is an open source item that if it could be used for this would be great because it is something I have already. If not, something like this sensor could be ordered for this project (http://zerocharactersleft.blogspot.ca/2011/11/pcb-as-capacitive-soil-moisture-sensor.html). I am also open to another sensor if available, but must be capacitive and work in the same way as these. Power Supply: I need to be able to adjust the frequency in order to do some testing. As mentioned I have access to test equipment that can do this, but I will need to know how to attach it, and the power needed to run the device, etc. If changing frequency can be done without a specialized power supply that would be beneficial, but not necessary. Personal Knowledge: I am very new to this. I was able to get the Chirp! and Arduino working together and giving me the correct results, but I will require clear and simple steps on how to connect and run this project. I do not have a background knowledge in electronics, etc. Cost and Timeline: I am open to bids on this project. I would like to have a firm price and keep it at that if possible. I would also like to have this completed as quickly as possible, so timing is important. Location: Generally location is not important, but my preference would be someone in the Toronto/Hamilton/GTA area so that meeting to discuss in person would be possible if needed. Generally makes projects like this easier and faster. Application Info: Please provide information on projects you have done before and what skills you have that will allow you to finish this project. I am not looking to re-invent the wheel with this project, I would just like to tweak what I am already doing with the Arduino and Chirp! and also add the ability to change frequencies. If this project works out, there is the possibility for further functions and additions. Please ask me any clarifying questions. Thank you.
Skills: Electrical engineering Arduino Electronic Design Electronics
Fixed-Price - Intermediate ($$) - Est. Budget: $100 - Posted
Looking for someone that can: 1. Design an efficient, battery operated 12v motor controller to perform specific time related on/off functions. 2. Build a small footprint prototype and ship to me. End Product: Floating Duck decoy that pumps water at timed intervals to create lifelike motion. Batteries, motor/pump, and controller to be housed inside decoy body. Controller Design specs: Take a 12v battery supply (most likely 8 AA alkaline batteries) Have on off switch to activate controller. Once controller is activated: It will turn 2 pumps on/off in pre-programmed time intervals on continuous loop until turned off (timing scenario to be given upon hire). Option 1: Single motor output. Option 2: 3 way switch for Low-Med-High level output To recap: I am only looking for the controller(PCB) design with Battery -input and motor(s) output terminals: Prototype and ship to me.
Skills: Electrical engineering Circuit Design Hardware Prototyping Microcontroller Design
Looking for the Team App?
Download the New Upwork Team App
Fixed Price Budget - ${{ job.amount.amount | number:0 }} to ${{ job.maxAmount.amount | number:0 }} Fixed-Price - Est. Budget: ${{ job.amount.amount | number:0 }} Open to Suggestion Hourly - Est. Time: {{ [job.duration, job.engagement].join(', ') }} - Posted
Skills: {{ skill.prettyName }}
Looking for the Team App?
Download the New Upwork Team App