Digital electronics advancement has now made it possible to control the speed of the electric motor digitally. Thesupply voltage to the electric motor can be varied by varying the firing angle digitally. By this, the speed of the motor now can be determined with more accuracy and precision with this digital method when compared with an analog system. This project can be divided into two parts which is the digital control section and the power section. The digital control section determines the triggering angle of the triac. The power section includes a circuit consisting of a triac which is in series with the motor and 240V a.c. power supply. The motor that is to be activatedis a universal motor which is a a.c.series motor. This power section is interfaced with the digital control section using an optoisolator. The digital control circuit consists of a zero crossing detector, a flip-flop, a timer, a counter, a latch and a digital comparator. The zero crossing detector with generate a positive pulse when the ripple voltage tapped from the Bridge Rectifier crosses zero. This high pulse will reset the flip-flop and thus the timer is activated. The timer is set to generate 256 clock pulse within a half cycle. The counter now counts the clock pulses initiated after zero-crossing. The counter output increases until the count equals the latched data value. The digital comparator responds to this equality and its output goes high, generating a trigger pulse into the triac gate. The triac now conducts for the remainder of the half cycle and the motor is turn ON. In this thesisreport, the author will cover in detail the design and accuracy of the digital motor speed controller, in which the explaination of the functions and purpose of each solid-state semiconductors device will be given. The author will also be elaborating on the principles of operation and application of the a.c. series motor. Schematic diagrams are presented to give the readers a better view on the discussed topics.