This thesis is about the design and development of the humidity/light control of motor speed by using PIC ( Peripheral Interface Controller). PIC is used to read the measured value of humidity/light sensor then controlling the seven constant speed of an AC motor by using a variable frequency drive. This thesis is basically discussed about the programming part and the hardware component selection and installation that will produce the given output from the PIC. The program is implemented in assembly language through MPLAB Intergrated Development Environment (IDE) software on PICDEM mechatronics demonstration board with built in PIC16F917 microchip.