this is a very simple project that does not cost very much and will not take much time. I put it in an Amazon box because it was there, but this could be mounted in just about anything.
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Step 1: Parts
1 x DS18B20 temp probe
1 x Arduino uno board
1 x LCD with I2C
1 4.7k resistor
all readily available on the internet, this project cost me around $20
some jumper wires
Step 2: Wiring of DS18B20
Red wire or VCC goes to 5v on Arduino
Black wire or ground goes to ground on Arduino
Yellow wire or Data goes to pin 2 (or whichever pin you have chosen)
there needs to be a 4.7k resistor in parallel with the Data wire and VCC wire as shown in diagram.
Step 3: Wiring of I2C LCD
GND pin to ground on Arduino
VCC pin to 5v on Arduino
SDA pin to A4 on Arduino
SCL pin to A5 on arduino
Step 4: The Code
There is a serial print loop in the code to assist in troubleshooting. It is not required for operation
Also I had a heck of a time finding a correct and working library for the LCD. Its attached to make things simpler for you.
Step 5: Finishing Touches
Now that you have a working thermometer and display mount it however you like for display. Enjoy!