A temperature sensor is a device that reads the temperature of the surrounding and relays the temperature either in degrees Celsius or Kelvin. The LM335 temperature sensor (used in the experiment) gives out the temperature in degrees Celsius. It is calibrated to output the millivolt voltage reading in proportion to its units of measurement i.e. it outputs 10mV/0K. The main objective of the project was to build a temperature sensor circuit using a LM335. As part of the project, it was also aimed to output various environmental temperature readings using discrete values on the LCD and as well use LEDs to show temperature readings beyond known values (in this case 27 0 C close). In the experiment, the IC that was used to measure the temperature was the LM335 IC. It was integrated with the Arduino to measure the temperature. The Arduino was to read the measured value from the LM335 and translate it into degrees Celsius which will be read from the computer from the Arduino serial monitor. It was found that the serial monitor displayed in an endless loop the temperature reading of the setup environs. If the temperature rose above the stipulated value (27 0 C), the LEDs connected to the circuit lit. In conclusion, the circuit setup can be used to read various temperature readings of the environment and consequently ‘sense’ temperature beyond known values.