Build a Prototype Circuit

Completed Posted Mar 7, 2015 Paid on delivery
Completed Paid on delivery

I am asking an electronics expert to design a device that is simple to manufacture and reliable to use.

Required Components:

-Small LED Display (between 3 and 6 square centimeters in area)

-On/Off Push Button

-Current Up Push Button

-Current Down Push Button

-1 Anode Wire, 1 Cathode Wire

-9V Battery

Basic Circuit Functionality:

-Mainain any current the user sets be 0 and 2.0 mA in 0.1 increments given variable resistance between 2,000 Ohms and 30,000 Ohms.

-Detect when circuit is broken (anode —> device with variable resistance —> cathode) and power down.

-Prevent a current above 2.0 mA from ever going through the circuit.

Circuit Notes:

-The device with variable resistance will need to be simulated. In use this device will actually be the human body.

Desired User Experience:

-Press On/Off Button

-LED shows “0.0 mA”

-Press Up button once.

-If circuit is not complete: LED shows “Connect”

-If circuit is complete: LED shows “0.1 mA”. Current is flowing at 0.1 mA.

-Pressing Up button repeatedly brings current up to “2.0” but not higher.

-Pressing Down button brings current down by 0.1 mA.

-If circuit is broken while current is flowing, device powers off immediately.

-If On/Off Button is pressed for more than 2 seconds while current is above 0, the current will step down at a rate of 0.1 mA every 1 second. Then the device will power off.

-If On/Off Button is pressed for more than 2 seconds while current is at 0, the device will simply power off.

Goals:

-Minimize cost of components (Max $35)

-Keep manufacturing process simple (Max 20 min to assemble by a non-expert)

*Using Arduinos and any ready-made-components is perfectly acceptable even encouraged

-Keep the size relatively small (This will be a hand-held device that fits in someone’s pocket)

Deliverables:

-Functioning prototype (Does not need to have an enclosure, but that would be a bonus)

-List of components with prices and product URL (must be able to purchase)

-Step-by-step description of a Quality Control process (test and confirm functionality of a manufactured circuit, should take no more than 10 min)

Arduino Electrical Engineering Electronics Microcontroller Product Design

Project ID: #7262858

About the project

29 proposals Remote project Active Mar 13, 2015

Awarded to:

voyagerforth

Hi, You have produced a good specification thanks for that its appreciated. I have many years in microcontroler based design and manufacture. I have also spent many years in implantable device design and manufacture, More

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29 freelancers are bidding on average $1235 for this job

sagradoamicus

hi sir i am an expert embedded system designer I have read your requirements and can do it easily. Please consider me for this job I assure you quality work and on time delivery Please reply to discuss it further More

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uetian09ee506

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seshupower

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shahbaz1980

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VoblNet

Hello. I am ready to work on an interesting project. I can design and make a prototype, as well as to make all files for production.

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pcbdcs

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quang102

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Anthony989

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Manoj3050

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maxbul

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GlobalElectronic

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scribblerspk

What I understand is that you want to control the flow of current which is flowing through an object (Possibly human body) , besides this you want to have control to set the value of current up to 2.0mA. You also requi More

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cscinstructor

I have seen and fully understand your requirements please open chat window to discuss further ----------------------------------------------------------------------------------------------------------------------- More

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mamdouhmaitah

hello i am electronics engineer, i can do your project please check my profile and text me if you are interested mamdouh almaitah

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shrinivas02

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