Circuit Operation: Circuit diagram appears in the 0-5 the entered value the keypad circuit, which is connected to port P1 applied to the integrated DAC 0808 DAC output is obtained the analog voltage. P0 port is connected to the 7-segment display of the absolute value of the voltage, which is connected to port P2 indicator shows the decimal value of the voltage. On the keypad “*” key to delete the entered value, “#” key, the entered value is used to convert the analog voltage. Output of 0-5 V 0.1 V-0, 2Volt precision analog voltage is obtained.-Circuit Operation: Circuit diagram appears in the 0-5 the entered value　the keypad circuit, which is connected to port P1 applied to the integrated DAC 0808 DAC output is obtained　the analog voltage. P0 port is connected to the 7-segment display of the absolute value of the voltage, which is connected to port P2 indicator shows the decimal value of the voltage. On the keypad “*” key to delete the entered value, “#” key, the entered value is used to convert the analog voltage. Output of 0-5 V 0.1 V-0, 2Volt precision analog voltage is obtained.