IOW will anything in the walls block a bt or wifi signal?

I don't care if it's a little "clunky", I don't overstuff much. Also, I have access to some "advanced" antenna design software (Matlab etc), if that helps.


I've seen products on Amazon but I was thinking about a portfolio project.

Thanks so much

Joe

 

everything impedes radio signals... it is called distance...
and since it is impossible to focus and direct radio waves perfectly in a straight line, sufficient distance is "diminishing" signal regardless of medium... this also happens in vacuum of space.

so rather than asking silly question about "will it pass through wall", it would be better to state what materials are encountered, what distance is supposed to be covered and what kind of radio we are talking about. one could also simply try it. get any ESP32 product and see if it is accessible when placed inside fridge.

 

Is it feasible to DIY a wireless thermometer for my fridge and/or freezer?

Yes, it is feasible. I monitor my freezer since being bitten several years ago by a unit that failed. I use a DS18B20 temperature sensor and an ESP8266 module. It monitors temp inside the freezer with my ESP8266 outside the freezer. There are plenty of ways to go about this. The DS18B20 sensor is the encapdulated version. This is just one of several ways to go about it.

Take obstructions into consideration as mentioned, I have had no problems in a two story wood frame house and in addition I can monitor using my cell phone. With a little effort set points and alarm functions can be added to provide notifications if a freezer temp exceeds a preset limit. There are dozens of code samples online and a simple Google of "DS18B20 ESP8266" should get you a dozen hits or more.

Ron