MULTICOMP PRO 83-17990.Trigger Relay Module, Arduino, Raspberry Pi

83-17990. is a 5V trigger relay module for Arduino and Raspberry Pi. A relay is an automatic control device where the input quantity (electricity, magnetism, sound, light, heat) reaches a certain value, and the output quantity will change in a jumping manner. In life, we often need to use weak electricity to control strong electricity, that is, the problem of small current to control high current, such as the use of Arduino controller to control high-power appliances such as fans. For beginners, in order to be safe, we will not use high-power electrical appliances in this experiment. Here we will use small LEDs or small LED lights to complete the demonstration experiment.