On 29/02/2012 10:10 PM, Isaac Marino Bavaresco wrote:
> I bought one China-made parking sensor with 4 transducers to reverse
> engineer.
> Very interesting design.
>
> Uses a Cypress 8051-based PSOC with some programmable analog building
> blocks.
> I drawn parts of its schematic, I can send it if you are interested.
> It uses canned trimmable transformers, similar to radio IF transformers,
> but with just two two-pin windings.

I found one "hack" article and it showed the transformers you mention. =20
Not sure how available (in small qty - say 100) they are.

> The analog functions of the PSOC seems to be used for filtering.
>
> It uses one CMOS analog multiplexer to scan the transducers. There is
> just one analog front-end
>
>
> What I liked most in that device is that the same transducer sends and
> receives the pulses, and they are waterproof.
> It cost USD25.00 and comes with four transducers. It is cheaper than
> buying just the transducers from Digikey.

Crazy isn't it!
David...

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___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
___________________________________________

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