VOLTAGE CONTROL METHOD OF ANALOG/DIGITAL INTERFACE CIRCUIT FOR VENDING MACHINE

摘要

PURPOSE: Provided is a voltage adjusting method in an analog/digital interface circuit for a coffee vending machine which adjusts the output voltage of an A/D interface circuit rapidly so that it is helpful in minimizing errors. CONSTITUTION: The voltage adjusting method in the analog/digital interface circuit for the coffee vending machine is characterized by displaying an integer value for current water temperature and voltage correction as mode selection in a deep switch. The voltage adjuster is comprised of a thermistor sensor(11) which prints out a resistance value as the temperature of warm or cool water; an A/D interface circuit(12) which changes resistance values and prints an analog signal; an A/D converter(13) which converts analog voltage in the A/D interface circuit to digital voltage; a CPU(14) which changes digital voltage into temperature to print it or print voltage value; a temperature display part(15) which is comprised of 5 digits 7 segments to show temperature change value or voltage value; and a deep switch(16) which converts to temperature display mode or error correction mode to display temperature change value or voltage value.