Save this Search
     
Sort by:
  • Posted Date
Time Left: Less than 7 days
Fixed Price: Less than $500   |  Posted: Apr 25, 2015  |  Ends: 5d, 23h  |   4 Proposals
I need a program for an Arduino board so that it can generate 4 types of PWM. 1. Sinusoidal pulse width modulation - SPWM 2. Selected harmonic elimination - SHE PWM 3. Space Vector PWM - SVPWM 4. Hysteresis band current control PWM The user must be able to select the type of PWM that he wants and the frequency (1-200 Hz). The system is intented to work with a SINGLE-phase inverter. The Arduino board that will be selected will be anyone with an ATMega micropcessor. The final deliverable should be the arduino code files with extensive comment documentation.
Category: Electrical       

n****pas
 [?]
Sign in to view client's details.
| n****pas
|    Greece
Hourly Rate: $15 - $20 / hr   |  Duration: 1-3 months  |  Posted: Apr 18, 2015  |  Ends: 6d, 20h  |   9 Proposals
I need a wireless chip designed for wifi communication. Two of them. I need the chip to be operated by three buttons. The casting needs to fit into a watch size band. The signal constantly connecting and transmitting data to the other chip. receiver.
Category: Electrical       
Skills: Electronic Design, Digital Electronics       

k****ing
 [?]
Sign in to view client's details.
| k****ing
|    United States
Hourly Rate: $100 - $500 / hr   |  Duration: 3-4 weeks  |  Posted: Apr 18, 2015  |  Ends: 6d, 18h  |   15 Proposals
Hi I am looking for someone to design a device connect to a computer via USB and send signals to other devices of its kind on a net work, I will give a better explaination when contacted
Category: Other - Engineering &...       

A****tar
 [?]
Sign in to view client's details.
| A****tar
|    United Kingdom
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Apr 16, 2015  |  Ends: 5d, 5h  |   8 Proposals
We are looking to build two versions of the PCBA with two schedules: 1. Power Only PCBA ? Take the raw DC 5V / 1.6A power from the charging unit, run it through a Boost Converter, Charge Controller, Microcontroller for LED, LED lightpipe (Bivar FLPR4.0-SBC), and other necessary inductors, etc. This version does not have a battery, protection circuit, or charge controller (for the battery). Essentially, this PCBA is a USB charger without the AC to DC conversion. 2. Power & Battery PCBA ? Requirements are attached. Everything on the Power Only PCBA with the requirements of an extra battery (1S1P protection circuit with thermistor). We own many Tenergy 30262 batteries and would like to use them. Testing: Both units must pass FCC testing and any other required testing. The battery unit must pass DOT tests. Schedule: Power Only PCBA is ASAP. Power & Battery PCBA target is end of May. Please feel free to contact me with any questions. Look forward to receiving ...
Category: Electrical       
Skills: PCB Design, USB Electronics, battery, charging       

B****han
 [?]
Sign in to view client's details.
| B****han
|    United States
Hourly Rate: Not Sure   |  Duration: 1-3 months  |  Posted: Apr 15, 2015  |  Ends: 4d, 7h  |   13 Proposals
Design and develop 3.7V charging circuit for consumer electronics products. RF experience a plus. Experience working on or with smartphone products is also a plus. 25 to 40 hours per week
Category: Electrical       
Preferred Location: United States

D****-MJ
 [?]
Sign in to view client's details.
| D****-MJ
|    United States
Fixed Price: $20 - $1,000   |  Posted: Apr 15, 2015  |  Ends: 4d, 6h  |   17 Proposals
Our company is seeking a freelancer to design and build a data logging board that will be used in an exposed outdoor environment. The device should be housed in a weather tight enclosure. The enclosure will need to have a bulkhead connection in order to allow a water hose to be connected for pressure sensor readings. The device should also be capable of storing readings from a pressure sensor which detects water pressure. The readings would ideally be stored onto an SD memory card for later retrieval. The device should have an external ON / OFF switch. The device can be made using an off-the-shelf device such as an arduino if the cost is less than designing a custom printed circuit board. In summary, the device should have the following operating characteristics: -- Weather tight enclosure suitable for use in an outdoor environment -- Bulkhead connection for water pressure connection -- External ON / OFF switch -- Pressure Sensor capable of being in continuous contact with ordin...
Category: Electrical       
Skills: Electrical Engineering, Electronics       

H****rks
 [?]
Sign in to view client's details.
| H****rks
|    United States
Fixed Price: $30 - $250   |  Posted: Apr 14, 2015  |  Ends: 3d, 11h  |   6 Proposals
Hello Boys and Girls ! I need a temperature controller that uses pwm to keep a temperature at set point, it can for example b used to control a 220v heater or circulating pump. it needs to have a Pot for Temperature setpoint, a Pot for lowest output setpoint Pot for highest power output and a kty81 sensor input, it shall work directly from 220v ac and have a triac for 4kw load. The kty81 sensor is isolated and can have mains connected so no optocouplers or galvanic isolation is needed . One simple way to do this project would be to use a simple chinese 4kw triac controller and add components like sensor and pots to it. It is very important that i get a cheap device in hand when project is finished, no expensive shit, cheap and simple. Sample sensor   [obscured]  /itm/KTY81-110-Temperaturfuhler-2-Meter-PVC-Speicherfuhler-Fuhler-Kesselfuhler-KTY-/301148656770?pt=LH_DefaultDomain_77&hash=item461ddbd482 Sample ssr device to use as base :   [obscured]  /itm/High-Power-400...
Category: Electrical       
Skills: .NET Framework, Electronic Design       

s****ltd
 [?]
Sign in to view client's details.
| s****ltd
|    Sweden
Hourly Rate: $20 - $30 / hr   |  Duration: Not Sure  |  Posted: Apr 14, 2015  |  Ends: 3d, 6h  |   3 Proposals
We are a privately held company that designs, patents and manufactures humane-focused products for dogs. Currently seeking an electronics engineer for contract work. Engineer must be located within 100 miles of the Houston area. Knowledge of Piezo generators helpful, but not required.
Category: Product Design       

S****015
 [?]
Sign in to view client's details.
| S****015
|    United States
Hourly Rate: $20 - $30 / hr   |  Duration: 3-4 weeks  |  Posted: Apr 14, 2015  |  Ends: 3d, 0h  |   17 Proposals
Hello, I am designing a custom solar energy harvester. I need someone who is proficient with PCB design as well as electronic circuits. there are boards online premade like from sparkfun, but these do not meet the specifications I require. I am on a tight budget but I'm sure we can make something work. I'm looking to have the board in my possesion as soon as possible. Thank you for your time.
Category: Electrical       

m****for
 [?]
Sign in to view client's details.
| m****for *
|    United States
Hourly Rate: Not Sure   |  Duration: 1-2 weeks  |  Posted: Apr 13, 2015  |  Ends: 1d, 23h  |   31 Proposals
Looking for an experienced ee to design our circuit. We need to have good communication skill, be punctual and prompt.
Category: Electrical       
Skills: Electronic Design, PCB Design       
Preferred Location: Eastern Asia

n****ech
 [?]
Sign in to view client's details.
| n****ech
|    Australia
Fixed Price: Not Sure   |  Posted: Apr 12, 2015  |  Ends: 1d, 7h  |   19 Proposals
Seeking assistance finalizing the electronics for a new product I've been developing for the last 3 years. Preparing for product launch this year. I'm a mechanical engineer (10 yrs in product development) seeking an electrical engineer with experience designing basic power conditioning and distribution circuits. Looking for somebody with PCB design experience. This is a startup opportunity and I am offering equity and/or potential partnership in my company or a contract with conditional payment terms based on receipt of funding. I am anticipating investment in the 2-3 month time frame. I am looking for somebody extremely motivated and ambitious to partner up with. A signed Non-Disclosure Agreement will be required before any technical data is shared. Please contact me if you are interested and I will email you the NDA.
Category: Electrical       

z****las
 [?]
Sign in to view client's details.
| z****las
|    United States
Hourly Rate: $15 - $20 / hr   |  Duration: Not Sure  |  Posted: Apr 12, 2015  |  Ends: 16h, 19m  |   22 Proposals
I need a simple circuit built in a smaller form factor - maximum of 3 x 4 inches. Functions of the circuit will have an LED light, a sound byte that will play through a speaker on circuit and a button that will turn off the light.
Category: Electrical       

t****rge
 [?]
Sign in to view client's details.
| t****rge
Fixed Price: $500 - $1,000   |  Posted: Apr 12, 2015  |  Ends: 15h, 12m  |   6 Proposals
I am looking for some one who can realize fractional order switched capacitor circuits and implement it in Matlab and in h-spice too
Category: Electrical       

s****k17
 [?]
Sign in to view client's details.
| s****k17
|    Canada
Fixed Price: $150 - $350   |  Posted: Apr 11, 2015  |  Ends: 13h, 56m  |   12 Proposals
Ok I have in mind a device that I have a vision for. The technology, potentially, could be used for many applications. I have one idea right now that would form the basis of design. **note this product involves electronic components such as market available GPS module / antenae. I am willing to pay to get a very good product, however it will be broken into sections, each with various weighting in progress payments. Meaning, no point paying the full amount only to find it isn't feasible. So I propose the following overall breakdown : 1. Investigate Phase - Investigate the components I propose or suggest alternates, with regards to achieving the specified outcome. Investigate any patents (freedom to operate), or potential for patenting this idea. Provide feedback as to whther the idea will work from a technical standpoint, and approximate costings of components, with basic design and manufacture approach. (In a nutshell, can my vision become reality with components currently availabl...
Category: Electrical       

N****L83
 [?]
Sign in to view client's details.
| N****L83
|    Australia
Fixed Price: $1,000 - $5,000   |  Posted: Apr 11, 2015  |  Ends: 9h, 26m  |   22 Proposals
We are looking for someone to assist us with building the prototype for a tobacco rolling machine we just finished designing. We have all the 3d model files for 3d printing and BOM ready to go for you. We have attached an NDA to sign so we can discuss the project further. We look forward to seeing your proposals.
Category: Electrical       

t****t15
 [?]
Sign in to view client's details.
| t****t15
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Mar 31, 2015  |  Ends: 4d, 3h  |   4 Proposals
Hi i am looking for the multiple loop feedback structures that should be applied on continuous time current mode filter and design equations for that project. If any one are good in this topic please respond or you can contact me at   [obscured]  . Thanks..
Category: Electrical       

r****thy
 [?]
Sign in to view client's details.
| r****thy
|    Canada
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: Mar 31, 2015  |  Ends: 4d, 0h  |   5 Proposals
hi i want to know if you know about the multiple loop feedback method(FLF and IFLF). I need the design equations of this method on continuous time current mode filter. Can you help me with this work please bid.
Category: Electrical       

r****thy
 [?]
Sign in to view client's details.
| r****thy
|    Canada
Fixed Price: Less than $500   |  Posted: Feb 02, 2015  |  Ends: 4d, 6h  |   22 Proposals
I am looking for an electrical engineer to design an electrical control box for an oven. I will need detailed specifications that I can use for taking in offers for parts and/or a fully assembled control box. Delivery is a list of components and schematics for wiring. We will only be making a few of this machine at this time, so I think it would be better to use PLC:s rather than PCB:s. The box will control one motor and two heating element arrays. The motor will need adjustable speed and soft start. The motor will also work and pause in intervals. The element arrays will be controlled individually and by a common thermostat. The elements will also be controlled with a timer. The machine will need an emergency kill-switch that turns everything(motor&elements) off Attached is a schematic representation of our system and our needs
Category: Electrical       

a****zzz
 [?]
Sign in to view client's details.
| a****zzz
|    Sweden
Symbol Key
Payment method not yet verified
Payment verified
Purchased $1-$500
Purchased $500-$5,000
Purchased more than $5,000
You have already submitted a
proposal to this job