Arduino, I used an uno
Resistors for LED
In the code you can change the temperature triggers for the LEDs, to better suit your situation.
Step 1: Breadboard Setup LEDs
It is a very basic setup, don't be confused by my excessive use of wires.
To begin with locate 8 LEDs of your own preferred colours and put them into your breadboard, positive leg into the main tracks, negative into the ground rail.
Next put your resistors from the track opposite your led, over the middle and into the same track as each individual LED.
Now plug jumpers Into the same tracks as your resistors, 8 in total and connect them to pins 2,3,4,5,7,8,9,10 on your arduino.
Finally link the ground rail of your breadboard to ground on your arduino.
Step 2: Breadboard Setup Sensor
Ben the sensors legs into 3 lanes on the breadboard, use the image above to wire out 5v to arduino 5v, analogue voltage out to arduino A0 and Ground to the ground rail on the breadboard.
Your breadboard should now be setup.
Step 3: The Code
Apologies, i thought the code was in already on text form.
int tempPin = 0;
int pin2 = 2;
int pin3 = 3;
int pin4 = 4;
int pin5 = 5;
int pin7 = 7;
int pin8 = 8;
int pin9 = 9;
int pin10 = 10;
temp = analogRead(tempPin);
temp = (5.0 * temp * 100.0)/1024.0;