Heart is a vital organ inside human body. its function is for blood circulation inside body through fein. Heart beat frequeny and strength are different from person to person. Heart beat detection is needed to know a patient condition. Usually, the detection of heart beat is conducted by touching fein beat at human hand. The method needs a high consenration and needs a watch as tier. Modern technology allows us to produce automatic instruments to do heart beat monitoring through fein. The instrument built will detect heart beat through blood flow frequency at hand finger, and will process the information electronically. This instrument will show the total heart beat in every minute and the beat rhythm in graphic visualitation using graphic visualitation using graphic LCD, so that the result can be seen whether the person heart is in good condition or not. Keywords: Microcontroler AT89C51, Graphic LCD, Heart Beat