DS18B20 - Robust Temperature Sensors

These onewire temperature sensors come in a variety of packages and a metal cased robust packaging is shown.

They don't use I2C so a pin has to be dedicated on the ESP01 to servicing these, but one pin can service many sensors in parallel, each having its own address.

Because these sensors can be implemented in a robust package, they are ideal for mounting outside in unprotected areas, such as underneath a vehicle, and can still be relied upon to operate.

Software to implement these ideas can be viewed on github here