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5V 1-Channel Relay interface board and each one needs 15-20mA Driver Current
Easy to communicate with the LCD module
DC-: module DC power supply negative (trigger terminal negative voltage)
CH340G board
Buzzer for Arduino (Passive and Active ) Size:Active 5V 1-Channel Relay interface boardA buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devices, timers and confirmation of user input such as a mouse click or keystroke. Buzzer is an integrated structure of electronic transducers, DC power supply, widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other
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