Description

Three - person voting machine production kit electronic components DIY experiment welding exercise pieces

Description: This product is scattered parts, need to be welded after purchase. The three-person voting device mainly consists of a 3-8 bit decoder (74HC138) and two 4-input and non gates (74HC20). Receive user input through three buttons. Press the button to indicate consent; Failure to press indicates veto. When no one presses the button, or only one person presses the button, for example,S1 presses the button, but S2 and S3 do not press the button, the red light is on, the green light is off, and the buzzer is silent, indicating disapproval. When more than two people press the button, for example,S1 and S2, the red light is off, the green light is on, and a buzzer sounds to indicate pass. Parameters: Power supply voltage: 4.5-5.0V (DC voltage) Board size: 4.0*5.5cm Schematic Diagram: