[chbot] daft chocolate fish contest

[Mark Atherton]

A cunning idea, but there is metal-metal contact 
on our units lid / body (I think)

Just wondering about using DTMF, maybe using the 
generator running at much higher freq than 
normal, and using a peizo sounder attached to the inside of the vessel.


At 12:06 p.m. 21/10/2014, you wrote:

>I'm sure you could electrically isolate the body 
>and lid (gasket material around the lock 
>flange), ground one, signal for the other. You 
>could drop the battery power if you could also 
>isolate the center of the safety valve or vent 
>and run power in there as well, or just have 
>common ground and run the raw sensor signals out. (Only two sensors specified).
>Probably cooker-model dependant though.
>
>Geoff
>On 21/10/2014 11:41 AM, "Mark Atherton" 
><<mailto:markaren1 at xtra.co.nz>markaren1 at xtra.co.nz> wrote:
>Yup, Morse would work, since it is machine readable.
>
>No holes allowed.
>
>Yes, it appears that our pressure cooker is 
>magnetic - bugger. I was planning on a magnetic coupling loop running at 2kHz.
>
>
>
>At 10:42 a.m. 21/10/2014, hamster wrote:
>
>Can it send back Morse code by tapping on the side?
>
>-... .-.. --- --- -.. -.--Â  .... --- -Â  .. 
>-.  .... . .- .-.  .- -. -..  -- -.--  . .- .-. ...  .... ..- .-. -
>
>On 21.10.2014 10:35, Mark Atherton wrote:
>
>a device that can be placed inside a pressure cooker and report back
>temp and pressure in real time.
>
>- inside a full farraday screen
>- battery powered (?)
>- 100+ centigrade
>- possibly one extra atmosphere of pressure
>
>Might be even more difficult than Jaspers gizmo :)
>
>Any thoughts ?
>
>-mark
>
>PS LF signalling might be able to penetrate stainless steel
>
>
>
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