Absolute encoder sensor design and construct (optical)

I have a need for a "true absolute" encoder with a relatively tough specification. I have a design and hand-made working prototypes (proven) for a 6 bit version and I now need to have the whole design finished professionally and made into a commercial unit, hopefully with a couple of upgrades on the way.

The current design uses Avago reflective optical sensors (6 in the prototype, giving 6 bit resolution, but prefer to go higher, if feasible) using a single track grey code wheel. The specification:

- 100 degC ambient operation

- 7mm thick, or less

- Through hole mounting (e.g. to fit on 8mm gearbox shaft)

- True absolute (reading at power on without movement)

- 6 bit resolution or higher

- Ideally incorporates a high resolution (365 line) relative track for interpolation

- 23mm outer diameter of housing

- Serial digital output (e.g. CAN bus, 485) of decoded angle

- Low power consumption (battery operation)

I have all the code tracks for 7, 8, 9 bits, etc. and conversion algorithms. Can provide Solidworks drawings, PCB drawings, etc., of current design. Attached zip file shows pdfs of main parts of current thoughts on a design and a photo of the hand built working prototype.

NB: Please only apply if you have experience in the area of sensor development! Deliverable must be a working and tested product to agreed specification. Alternative methods to the suggested design that achieves the specification will be welcomed. (For example, due to the tight space constraints, fibre optics could be used to get a signal away from the restricted space and provide more room for the sensor processing electronics).

Skills: Electronics, Embedded Software, Mechanical Engineering, Mechatronics, Product Design

See more: working prototypes, uses of algorithms, tested and proven, solidworks on line, solidworks experience, room specification, resolution engineering, product prototypes, product mechanical design, product design specification, product design and engineering, mechanical design in optical engineering, low bits, line algorithms, i need a design made now, get a prototype product made, get a prototype made, get a prototype built, engineering mechanical design, engineering design product development, digital bits, development of product design, development of algorithms, design pcb need, design optics

About the Employer:
( 1 review ) Carindale, Australia

Project ID: #4391787

6 freelancers are bidding on average $2353 for this job


hi, i am an electrical engineer and an embedded system designer. i can help you with this project.

$4500 USD in 65 days
(22 Reviews)

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$1575 USD in 45 days
(17 Reviews)

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(13 Reviews)

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(14 Reviews)

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(13 Reviews)

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$1500 USD in 100 days
(1 Review)

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$1540 USD in 15 days
(0 Reviews)