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Posted: Within 24 hours
Fixed Price: $500 - $1,000   |  Posted: 2h, 0m ago  |  Ends: 14d, 21h  |   4 Proposals
We need help designing a very simple circuit, that will fit our specifications. We are trying to use the attached LED, with the attached LED driver (or an equivalent), but we don't know how to design an appropriate circuit for our specs. We want the LED to run at 18.2V and 1.2Amps. We don't need anything fancy, no PWM functionality. We just need to turn the LED on and off very quickly via a +/- 5V signal. Please see the "Shopping List" below for further requirements and specs. SHOPPING LIST: Input Power 24v dc-27v dc Battery 150AH Led Requirements 1. Build a linear array of 120 light that will be powered using a 24vdc 150 amp battery. 2. The lights will be mounted on a heat sink that will cool the lights to temperatures well below the required operating temperatures. 3. Regulate input to each led to 18.3v dc and limit amperage to 1.2 amps 4. Ability to turn light on and off 10,000 times per second for 14 micro seconds. 5. Each LED will have a dedicated driver to prevent t...
Category: Electrical       

4****ech
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| 4****ech
|    Canada
Fixed Price: Not Sure   |  Posted: 2h, 11m ago  |  Ends: 14d, 21h  |   1 Proposal
Our product will monitor soil conditions and perform actions based on the measurements. Using an app (Android, iOS, and web based), users can specify triggers for notifications when the soil is outside of the acceptable range (for example, if the temperature is approaching freezing, or soil pH is getting too high). The app will also access the historical data that will be stored via the web to track growth and associate pictures taken. We would like the device to meet the following requirements: Sensors Temperature:range from -40 to 140, accuracy of 1 Humidity: range from 0 to 100% RH accuracy of 2% Barometric pressure Light intensity: range from full daylight to night using photoresistor or solar panel to detect Soil pH: range of 4.5 to 9.5 pH, accurate down to 0.5 Enclosure Waterproof Weatherproof & UV resistant 3"x3"x2" maximum dimensions (not including any probes that would go into the soil) Replaceable battery (AAA or AA size) Data The device should tra...
Category: Product Design       

P****lue
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| P****lue
|    United States
Fixed Price: Less than $500   |  Posted: 2h, 28m ago  |  Ends: 14d, 21h  |   0 Proposals
Simple modification of an FRS or similar radio module to send an alert tone in response to a switch opening (reverse sense from normal). Second phase after proof-of-concept may involve some mechanical packaging in existing molded housing.
Category: Electrical       
Skills: Circuit Design, Analog Electronics       

A****297
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| A****297
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: 11h, 41m ago  |  Ends: 14d, 12h  |   5 Proposals
We are a solar PV company based in Yorkshire. We are looking for a PVsyst freelancer who can work with us on an ongoing basis, starting with a 270kW project ASAP.
Category: Other - Engineering &...       

H****rgy
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| H****rgy
|    United Kingdom
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: 11h, 43m ago  |  Ends: 14d, 12h  |   0 Proposals
We are a solar PV company based in Yorkshire. We are looking for a PVsyst freelancer who can work with us on an ongoing basis, starting with a 270kW project ASAP.
Category: Other - Engineering &...       

H****rgy
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| H****rgy
|    United Kingdom
Fixed Price: $120 or less   |  Posted: 12h, 45m ago  |  Ends: 6d, 11h  |   2 Proposals
I need a program for an Arduino board so that it can generate 2 types of PWM. 1. Space Vector PWM - SVPWM 2. 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 frequency will not be changed with a potensiometer because of the noise but from the serial monitor. The system is intented to work with a SINGLE-phase inverter. The Arduino board that will be selected will be arduino uno. The final deliverable should be the arduino code files with extensive comment documentation.
Category: Electrical       

n****pas
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| n****pas
|    Greece
Hourly Rate: $20 - $30 / hr   |  Duration: 4-6 months  |  Posted: 14h, 21m ago  |  Ends: 14d, 9h  |   1 Proposal
Dear PCB Engineers, You are applying for a position wherein you will be required to document a.k.a write academic papers on the new PCBs and design techniques we use in our R&D lab on a day to day basis, IP rights shared between you and the company. Hence we will be scouting for engineering as well as English writing talents. Since we would like to have a taste of your abilities, after you send in your applications we will be sending you a research paper to selected candidates among the applicants, so that you may rephrase the content, add your insight and tell us something we don't know yet about the paper. Its an interesting job for people who are in love. Happy Applying.
Category: Electrical       
Skills: Electrical Engineering, Electronics, English       

s****tes
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| s****tes
|    India
Fixed Price: Less than $500   |  Posted: 14h, 40m ago  |  Ends: 14d, 9h  |   5 Proposals
We require an engineer to consult us on the plausibility of our idea and solutions to a few engineering problems we have for said idea. We need an engineer who is experienced with current bluetooth/wireless technology, small electronic measuring parts, and circuit/programming knowledge. We aren't necessarily looking for a full-up design files, but we would like to know if what we are trying to do is plausible and what technologies we would need to accomplish it.
Category: Electrical       

d****ses
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| d****ses
|    United States
Fixed Price: Not Sure   |  Posted: 16h, 18m ago  |  Ends: 14d, 7h  |   29 Proposals
Hello, I'm looking for a CAD designer with experience in enclosure design. The device I'd like created is an electronic padlock. I have an aesthetic design that I'd like converted into a CAD so I can present it to manufacturers. Looking for someone that has experience with glass, plastic, aluminum, and chrome.
Category: CAD       
Skills: 3D Modeling, AutoCAD, SolidWorks       

s****ent
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| s****ent
|    United States
Fixed Price: Less than $500   |  Posted: 20h, 6m ago  |  Ends: 14d, 3h  |   8 Proposals
ARDUINO-BASED CUTDOWN DEVICE FOR HIGH ALTITUDE BALLOON This project would involve designing, programming, and fabricating a finished prototype, possibly using a small single-purpose Arduino processor (i.e. Micro or Nano, or something similar) to serve as a cutdown device for a high altitude balloon. Requirements: - The device needs to be as small, lightweight, and durable as possible. - The device needs to operate using an Energizer Advanced Lithium 9-volt battery as its power source. Operation: Basically, the device would be a simple timer. - Turn on the device and a small red LED begins to flash, letting the user know that the device is active. - Turning on the device starts a 60-minute countdown. At the end of the 60-minute period, the device would activate a reed relay to allow current from the 9-volt battery to flow to a user-supplied piece of nichrome wire that would heat-up and sever a small piece of braided mason lin...
Category: Contract Manufacturing       
Skills: Electrical Engineering, Electronics, Arduino       

d****ray
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| d****ray
|    United States
Hourly Rate: Not Sure   |  Duration: Not Sure  |  Posted: 22h, 13m ago  |  Ends: 14d, 1h  |   6 Proposals
Looking for a C programmer to clean up a code Implementation for 'ZombieDash' video game on the Teensy LCD board. The game is written in the C programming language. use of the LCD screen, buttons, LEDs, potentiometer, and ATMEGA32 chip. code written for the Teensy and must compile using the AVR-LIBC environment. using the libraries provided.
Category: Electrical       
Preferred Location: North America, Western Europe, Eastern Europe, India/Southern Asia, Eastern Asia, Middle East & Central Asia, Central & South America, Africa

t****ola
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| t****ola
|    Australia
Fixed Price: Not Sure   |  Posted: 23h, 10m ago  |  Ends: 14d, 0h  |   5 Proposals
In need of a circuit designer who can create a breakout board in Eagle CAD. The board should have programming pings broken out. Instructions for simple programming as well as for environment setup is needed. The breakout board should replace an expensive programmer. Example sketch and Eagle CAD files as well as all the instructions are part of the delivery. Somebody with experience with STMicroelectronics STM32L is preferred.
Category: Electrical       

u****mir
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| u****mir
|    United States
Fixed Price: Not Sure   |  Posted: 23h, 25m ago  |  Ends: 14d, 0h  |   10 Proposals
I need a circuit that can be used by an external microcontroller to communicate over ZigBee. The circuit should contain the zigbee chip, potential range extending amplification, antenna (one of chip-,wire-, pcb antenna) The range should be 1mile+ line of sight. The BOM cost should be kept minimal. Please include in your proposal your relevant experience. Also basic firmware should be part of the deliverable.
Category: Electrical       

u****mir
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| u****mir
|    United States
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