This project is a standalone automatic fan speed controller 
 Control the speed of the fan according to us 
 Requirements. With embedded technology  this will be closed 
 Efficient and reliable loop feedback control system. arduino is dynamic 
 Faster control. Liquid crystal display (LCD) constitutes the system 
 user friendly. Measured temperature and fan speed  
 The values are displayed simultaneously  on the LCD panel. that is 
 Very compact, with few components and feasible. 
 Air conditioner, water supply, snowmelter, furnace, heat exchanger, mixer, 
 Ovens, incubators, hot springs, veterinary farms 
 table. The ARDUINO microcontroller is the heart of the circuit 
 Because it controls all  functions. Temperature sensor LM35 
 Measures temperature and converts it to electrical 
 (Analog) Signal applied to Arduino. Or 
 The recorded and set temperature values are 
 16x2 line LCD. The microcontroller drives the transistor 
 Controls the speed of the fan. This project uses tuned 12V, 2A 
 power supply. This project is useful in the process industry 
 Maintains and controls boiler temperature.