Another idea is:
each knob for the burners has an axle that goes from outside the housing to inside.
Is this axle visible?
Would it be possible to mount something on that axle?
best regards Stefan
Discounting for now all the safety mentioned. We will get back to that.
Residential gas stove using available natural gas. The supply pressure is measured here in the US as inches of WC (Water Column) and is typically 8 inches of WC or about 0.5 PSI so keep that in mind. Next you really don't care about flow rate or total, all you care about is there either is or is not natural gas flow. I would use a simple inline flow switch, here are a few examples.. The link is to quality flow switches I have used in the past. There are likely plenty of imported knock off switches. Keep in mind that residential natural gas delivery is very low pressure when selecting a flow switch.
Next, we are talking about a common everyday natural gas residential gas stove. While obviously some installation safety precautions are in order assuming common sense and the use of pipe dope this is not complicated and does not require a diploma in natural gas installations assuming such exist. Install the inline switch using pipe dope. That done squirt some water mixed with a dishwashing liquid at the pipe joints and look for bubbles. There is not much to this. Order a stove from Lowes or Home Depot. They show up, install the new and remove the old.
All you want to do is turn on some above stove LED lighting. I see no reason at all for a micro controller. Just a switch or possibly switch with a transistor driving your lighting. Depends on switch and lighting.
Ron
Do you want to turn on individual lights for each burner or all of them when any burner is on?
What country are you in that would approve soldered joints for the gas pipes.?
is the relevant term here.
Germany
hard soldered is a word by word translation from german.
The correct technical term is brazing
Translated from an article from 2020
Permitted connection techniques Copper pipe as a gas pipe
The following connections may be used for gas pipes:
Natural gas:
Brazing (without restrictions)
Welding (without restrictions)
Pressing (without restrictions)
Clamps (less than or equal to 28 mm)
Liquefied gas:
Brazing (less than or equal to 35 mm)
Welding (without restrictions)
Pressing (without restrictions)
This means that there are very precise regulations if you want to use copper pipes as a gas line. These must be strictly adhered to. The RAL tests must also be taken into account.
another source:
Brazing almost always only with fittings
According to DVGW worksheet GW 2 [8], the brazed connections must always be carried out using capillary solder fittings.
best regards Stefan
Why not settle for a simple capacitive touch switch neatly placed near the hob? Possibly hidden, no visible wiring. Tap it ever time you light a burner.
Alternatively, I wonder if sufficient gas escapes before ignition to get detected reliably by a sensor above?
Fine in UK.
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