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Flash it with the arduino temperature ds18b20 example. Just change pin fron 10 to 6. You should read the sensor in the terminal window.

The esp can work on Station/Access point mode, with the station part getting ip by dhcp from the main router and the AP part on a different network (192.168.4.x/24 by default).

The Pi adds a lot of funcions, but if they insist in going without one, then use BrewPiLess controlers.

Yes, I run openVPN on the pi at home. Works great. Also experimenting with ZeroTier, a litle slower to startup the connections, but great after that. And you do not need any DNS setup.

On the arduino are you testing on 3.3v or on 5v. That could make a difference on some sensors. And do not pull up to 5v on ESP, only to 3.3V. Try the same test script from Arduino on the ESP, only change the data pin.

Be awewre to use a food safe antifreeze, just in case of some leaks.

This one is quite clear: https://github.com/vitotai/BrewPiLess/blob/master/doc/HardwareExample1.md

Underground temp is pretty stable year round in all the world. From a 30’ deep well 50F or lower is not rare.

DuncB, Brewpiless work on 2 different networks in its life cycle. In the initial config it generates the wifi network, and it is in 192.168.4.x range. Once you setup the wifi ssid and passwor it attache to your home network, and get whichever ip yor home router assigned it. Then you can...

It pay , form the energy eficiente point, to have 2 smaller counterflow in the lower shelf. Run the first with tap water, and send it to the hlt at ~60ºC for next brew or cleaning. The second one will get beer at 30 something and do a lower impact on the chiller.

Just today I found his about sensors not working at 5v “Maxim Integrated also produce the MAX31820 temperature sensor. The MAX31820 is a DS18B20 with limited supply voltage range (i.e. up to 3.7 V) and smaller temperature range of high accuracy. Like the DS18B20, it uses one-wire family code...

I bet no harm to system. Had seen many diy chillers with the big ice block. In deed is a way to store more “coold”, since ice could go below 0C

The software is designed for the ESP8266 chip. D1, nodemcu, esp-01 to ESP-12 are diferent modules with the same chip, so firmware should work ok on most of them if the gpio pins are present.

If instead of a Wemos D1 or an ESP-12 you can use a ESP-07 it has external anntena connector. I like the repeater idea. Now I have set an AP over my fermentation fridge to get goos signal inside.

The wiring is ok, and will work with any resistor between 1k and 5k. Just to be sure the gpio4 is not broken you could set up onewire bus on a diferent pin. I have used gpio17 some times, just change /boot/config.txt to: dtoverlay=w1-gpio,gpiopin=17 Do you have another micro, as an arduino or...

If you use 12V relays is handy to power the PI with a DC/DC converter as the CBPI interface board does. Like this one: DC/DC

If the sensors show up in the system folder then W1 suport is ok. CBPI only reads the sensor list when start, if you connect the sensor after that it will not show up. There is a bug in the one-wire basic plugin, but only shows up if you have more than one W1 bus. You may try some of the...

The only difference is the gain. -40 are more than 250 hfe . Will make no difference with 1k5 on the base.

A no brand 27L cooler hold ok with no more than 2C cooling in 60min. At 67C. Keep it closed all the time.

Yes, you can put a 330 ohms resistor in place of the diode. The main problem of not installing the temp sensor is the need to modify the software to skeep it, but is doable.