Bryggaren - forum för öl och bryggning

Hi bryggapa

All makes sense, and is as I now see it.

I had another peak at the controller pcb. It uses 1K resistors on the output of the rotary encoder, and as this will bring the (unimportant) current well down into the operation range of my optos, that is what I will go for.

Doing some mountain ...

Hi bryggapa

Thanks one again for you advice, and to be able to bounce ideas off you!

50 ma is the max forward current of my intended optocouplers, so I should be aiming for something a little lower. Although I cannot identify what the real rotary encoder is, browsing spec sheets of similar looking ...

Hi All
I now have a logical schematic for the circuit that will be used to emulate the rotary encoder on my induction hob. (drawn in KiCad).

Schematic_logical.png
The transistors and optocouplers shown are representative: I have not yet ordered the actual electronic bits yet.
Also not (yet) shown ...

I suspect that for our application, both common collector and common emitter may work, but the behaviour will be different

http://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/common-collector-amplifier/
http://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/common-emitter ...

Hi All

Thanks for all the ideas and advice.

Over the past few days I have done lots of work and thinking, but not much visible progress! My brain is bulging on all sides from all the research! 8)

I have ordered a Raspberry PI 3 + breadboard + T-Cobbler + various bits and bobs. The decision for a ...

Thank you for your patience and sage advice.

You have pretty much hit the nail on the head with the issue of the ground. Getting the ground(s) right and safe troubles me the most:

I think that the problem is my design has 2 conflicting requirements.

a) be able to rapidly switch back from ...

Yes, the ribbon cable is a JST XH-9a (this is printed on the pcb. under the cable). An extension ribbon is a good idea.

The proposed design concepts are:

Emulate the rotary encoder of my current digital hob using an Arduino / Raspberry PI.
Use a combined socket / “normally on” switch allow ...

HI all

Having spoken to a colleague who did electronics at university, at the moment hacking the control board of my existing induction hob via the rotary encoder is our favourite attack vector. The Hendi manual is a solid “Plan B”.

While I cannot identify exactly what rotary encoder is on the ...

Hi bryggapa

Respect is the key word: meaning I will proceed with caution, having fully informed myself of the options and dangers. As I work in IT, I do things everyday that I have never done before, and did not understand only a few hours ago!

I agree that separation of the control electronics ...

Gentlemen, thank you for your rapid replies!

We have a beautiful evening in Switzerland. I am sitting on my terrace as the sun goes down, digesting your answers, lubricated by a 3rd pint of Hippy IPA that I brewed earlier in the year. It makes reading Swedish much easier!

@AHm

Maybe I was asking ...

Hi All

I apologise for posting in English. With a mixture of English, Swiss German, guessing, (and Google Translate) I can more or less read Svenska, but I would make a fool of myself If I attempted to write it :wink: .

I have spent the last few evenings trawling the furthest corners of the web ...