Circuit Design Jobs

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Fixed-Price - Intermediate ($$) - Est. Budget: $500 - Posted
Looking for a small Bluetooth wearable device similar in size to a Fitbit or wristwatch. Device will be used for individuals with disabilities. Different colors and vibrations would be useful visual and tactile prompts to the hearing and/or visually impaired by providing different information and alerts based on color and vibration intensity. For circuit design purposes, the device will only do the following functions: - turn on/off various blends of a tricolor LED. Mix of Red, Green, Blue - turn on/off small vibration motor at varying intensities. ~ In working environment, multiple of these devices may be worn Will provide the engineer with defined 'code' to read which would represent the signal for on/off color and vibration intensity. Circuit design and implementation. - design a circuit board and build prototype that could fit into an existing generic shell enclosure. - Battery powered or rechargeable battery with a charging port - board would be communicated with via PC, Mac, iOS, or android device. - device would receive and adjust inputs from controlling device (for example, iPhone) to ~Turn on/off vibration motor at various intensities ~ Turn on/off light colors in various strengths (see attached image of software control design idea used to adjust lights and vibration). ~ Device discovered by operating system
Skills: Circuit Design Bluetooth Hardware Prototyping PCB Design
Fixed-Price - Intermediate ($$) - Est. Budget: $1,500 - Posted
We want to build a round shape Fitness Tracker with Bluetooth low energy. We need a production ready board/circuit design for a fitnesstracker device. Some specifications and possible parts which could be used. These Parts are not fixed you could use other parts if it makes more sense for your design. - Bluetooth 4.0 (Bluetooth and ARM Cortex-M0 SOC - nRF51822 ) - 6-Axis Accelerometer (3-axis accelerometer + gyroscope) - Indicator rgb-LED - Board should have a round shape with maximum diameter of 24mm - Powered by CR2032 Coincell Battery What our device should do at the end: - load the data from the device via BT 4.0 (LE) - show an indication via RGB LED while it is pairing/loading the data - get battery status - low enegry consumption, the CR2032 should work for several months If the design is properly done and we worked well together. We are also interested in a longer working relationship. Which could be the testing of the design, firmware development and prototype testing etc. not required: Please inform me if you have the possibilities/contacts to: Test/build a prototype and write the firmware for the device. Do a Production of 5000pcs. Injectionmolding for the product case of the electronicboard.
Skills: Circuit Design Bluetooth Eagle Electrical engineering
Fixed-Price - Intermediate ($$) - Est. Budget: $30 - Posted
I designed a PCB and order 3 test boards. After a while 2 of 3 boards doesn't work. I probably know the reason and the solution but I won't have the confirm from an engineer expert in analog electronics . The PCB charge a battery, a phone and there is a micro that plays some some via a MP3 module .The PCB are quite easy and this job shouldn't take more than 1 hour for an expert engineer.
Skills: Circuit Design Analog Electronics Electronics Embedded Systems
Fixed Price Budget - Intermediate ($$) - $25 to $200 - Posted
I need to develop a PCB prototype for a project I am working on. I would like to create a variable square wave function generator with the requirements below. I am using a regulated DC power supply for the input voltage. In short, I need a circuit that can input 14 volts DC and give me an adjustable square wave output via 3 potentiometers. For example.... Let's say I could set the pots to output at 9 volts - 60hz - 30% duty cycle. Right now I just need a working proof of concept. If the rest of the project works, I will need a production quality prototype created. Requirements; - Accept DC input at 14volts - Output a square wave, adjustable up to 12 volts DC at max 1.5 amps - Use a single turn pot to adjust frequency output between 30hz - 100hz - Use a single turn pot to adjust voltage output between 4 volts - 12 volts - Use a single turn pot to adjust duty cycle output between 10% - 99% - Small form factor (1.5" x 2") with surface mount components. 1st rough prototype can be through hole components, as long as they can be switched out to a surface mount component for the production prototype - I just need the board. I do not need a housing or enclosure at this point - I would like the pots to be able to turn with my fingers, not the small screw driver pots - Input and output terminals can be the small blocks with the screws I do not have any drawings or specific specs at this point. If the rough prototype works, I will outline the exact specs I need, as far as dimension and mounting holes, etc. Let me know if you have any questions.
Skills: Circuit Design Digital Electronics Electrical engineering Electronic Design
Hourly - Entry Level ($) - Est. Time: 1 to 3 months, 30+ hrs/week - Posted
I'm looking for a STM/PIC microcontrollers programmer. To develope a code for a six nixie tubes clock. There are two options: 1) start from scratch 2) use existing schematic solution and assembled PCB (based on STM32F100) Main of the features to develop: - show time/date - different transitioning effects when changing digits - IR remote control - 12/24h time format - alarm - automatic/manual tubes brightness control - floor tubes lighting with effects - BS18B20 temperature meter - TCP/IP for web controlling Detailed description of all features will be provided after successfull interview. Please apply if you are familiar with STM/PIC microcontrollers, displays, nixie tubes, and have time for that work.
Skills: Circuit Design Electrical Drawing Electrical engineering Electronic Design
Fixed-Price - Intermediate ($$) - Est. Budget: $150 - Posted
I currently have an AC motor and want to control its speed using an Arduino. I also have a 220v voltage regulator (, which has a mechanical 100k potentiometer and can control the speed of the motor. I thought I would use a digital potentiometer to replace the mechanical one, so I ordered an MCP41100, but when I hooked it up, it didn't work. I tested the digital pot and confirmed with a multimeter that it had the desired resistance between two of the terminals. However, when I connected the original terminals from the mechanical pot to the digital pot (which are two different circuits), the speed of the motor would not change. The deliverable for this project is Arduino Code and a circuit diagram. I would like to use the components I already have, but I am open to purchasing new components if they achieve the goal better.
Skills: Circuit Design Arduino Electrical engineering Electronics
Fixed-Price - Intermediate ($$) - Est. Budget: $931 - Posted
I am looking for a project freelancer in electronic control system for my engine prototype. I design most of the mechanical parts in this heat engine. Now I need an electronic engineer to work with mechanical design team to come up with a simple and reliable control system for an engine prototype. I have made a video presentation in my website homepage to show the basic function in this heat engine. Video is about 8 minutes long. Here is my company website. You can see the engine video presentation in the homepage. Electronic engineer will collaborate with mechanical team to select electronic components for following engine operation. 1. Working gas medium pressure sampling and data feeding to main control board. 2. Temperature sampling and data feeding to main control board from all sectors of engine cycles. 3. Embedded control program that can dynamically control gas medium flow rate according to gas pressure (initial and final), temperature (initial and final). 4. Control flow rate of heat source according to engine cycle (Power output and loading balance). 5. Electrical components selection according to prototype design specification. 6. Engine failure scenarios detection and communication in electronic system, which lead to safe guard kick in mechanism based on early warming instrument and algorithm. Applicants need to provide essential proof of working history, especially in area of heat engine or similar project. Please describe what role you did. Your ability and plan to implement necessary electronic solutions to current project. You will also need to provide your estimate time and cost to the project. Please itemize the time factor to the project milestones you foresee in the proposal. This project will try to fast track a prototype. Engineers will have to try to help project management to lock in off the shelf components as much as possible. You must have all essential kits in the control design and programming.
Skills: Circuit Design Electrical engineering Electronics Microcontroller Programming
Fixed Price Budget - Expert ($$$) - $500 to $1,000 - Posted
Dear Freelancers, We are looking for experienced PCB and Product Designer to create the following product: A Lunch Box that is powered has in-built onboard IoT chip that can supply energy to heat/cool the contents in the Lunch Box. Attached in this project are the pictures of BoxieBox(TM). Before you apply, please do answer the following questions: 1) What are your relevant expertise in PCB and Electrical Engineering. Also any relevant knowledge on product design? 2) Do you have knowledge with installation of Peltier Thermo-electric Cooler Modules? 3) What type of materials will you recommend to create the BoxieBox's exterior and what is the battery capacity recommended (e.g. 10,000 mAh etc.). 4) How long would you need to take to create the 1st Prototype 5)Also, what knowledge do you have with mass production or manufacturing contacts? 6) How much will be the estimated mass product price 7) Please provide an estimated of the breakdown of materials and cost to each materials when this product moves to mass manufacturing. Looking forward to your application, as we are working on a tight schedule to create the stipulated product. Further, we will be requesting for NDA to be signed before we will take the project further. Regards BoxieBox
Skills: Circuit Design Electronic Design Electronics PCB Design