Electronic distance measuring apparatus

An apparatus for measuring a distance using a laser beam and a supersonic wave, the apparatus comprising:

• a supersonic transceiver generating and transmitting a supersonic wave according to a control signal received from an outside and receiving the supersonic wave reflected and returning back;
• a laser generation unit generating a laser beam according to a control signal received from the outside;
• a resistance varying unit sensing a rotation of the laser generation unit, varies a resistance value according to an amount of the rotation, and dividing a constant voltage output from a power supply unit;
• a voltage multiplication unit sensing a level of the constant voltage output from the resistance varying unit and multiplying the constant voltage by a predetermined number when the level of the constant voltage is less than a predetermined level;
• an analog-to-digital converter converting an analog signal received from each of the supersonic transceiver, the resistance varying unit, and the voltage multiplication unit into a digital signal;
• a button unit comprising a plurality of buttons for receiving a command from a user;
• a display unit displaying a measured distance;
• a speaker unit generating sound when a distance measured by the supersonic transceiver reaches a reference distance;
• a memory unit storing distance data corresponding to a voltage value output from each of the resistance varying unit and the voltage multiplication unit in a table form;
• and
• a control unit controlling the speaker unit to generate sound after checking that the reference distance has been reached based on a signal received from the supersonic transceiver via the analog-to-digital converter, reading from the memory unit distance data corresponding to signals received from the resistance varying unit and the voltage multiplication unit via the analog-to-digital converter, controlling the display unit to display the distance data.