How to use this device:

1- usb cable to the computer
2- 9v battery to the Arduino
3- with hair blower or something hot heat up the LM35 sensor
4-note the fan speeding up
5- Use the serial monitor (or you android device to control the circuit)
-You have to download an app called “ArduDroid” but its not working properly any way
6- the commands to use through the serial monitor are 
‘-‘ to decrease the min temp
‘+’ to increase the min temp
‘*’ to reset the min temp to 27