Attach waterproof temperature sensor
How it's done
Like DHT22, this sensor also need resistor between Vcc and signal wire. Do the same like in one of the previous step and connect resistor between Pin 12 and 5V.
Connect yellow wire from sensor to Pin 12 on Arduino.
Connect gray wire from sensor to ground on Arduino.
Connect red wire from sensor to 5V on Arduino.
Of course you can connect ground wires with other where you have space. Same case is with 5V.