[chbot] daft chocolate fish contest

[Mark Beckett]

Maybe ultrasonic would work.
Attach the transmitter to the side, with the receiver on the outside ...

I'm still puzzled by exactly what is going to withstand the heat.
besides the IC and components, the battery is another challenge.


Good luck.

Mark

Mark Atherton wrote:
> 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?
>>
>> -... .-.. --- --- -.. -.--  .... --- -  .. -.  .... . .- .-.  .- 
>> -. -..  -- -.--  . .- .-. ...  .... ..- .-. -
>>
>> 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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