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Given that standard Arduino I/O is fairly slow (lots of clock cycles) repeatedly checking for a return value will use up time you can probably use elsewhere. Now if your using a something with a faster CPU such as a PI, BBB or Arduino Due then it probably doesn't matter. But does getting...

I do pretty much the same as jimmy, I send out the 1-wire request, go off and spin round the main control loop, every time checking if 750ms is up and if it is I read the temp sensors and immediately re-issue the 1-wire get temps request. I have DS18B20 sensors. I use the PID SW to control my...

Another alternative would be a HDPE 200L food safe drum cut in half lengthwise

There's some similarity with this to what oscsys with OpenTroller are doing using the MPX5010DP to measure wort level in the BK. Again a differential pressure sensor.