5V Relay Module

Electronic brick of relay can be connected to digital I/O port, when the input of S port is low level, relay will be under ‘disconnect’state; when the input of S port is high level, relay will be under ‘connect’state. It can be connected in series to the LED lights, buzzer or even the loop of a small lamp so as to control the state of the switch. Features 1. Plug and play, easy to use. Compatible with the mainstream 2.54 interfaces and 4-Pin Grove interfaces in the market. 2. With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock. 3. With protection circuit to prevent from burning the relay coil when disconnected; with isolation circuit to prevent damages to I / O port by relay switch current . 4. With LED status lamp to indicate whether it is currently connected or not. 5. Terminals with screws for easy wiring and removing Specifications PCB size 36.0mm X 24.0mm X 1.6mm Working voltage 5V DC Operating voltage 5V DC Compatible interfaces 2.54 3-pin interface and 4-pin Grove interface(1) Note 1： S for digital output port, V and G for voltage at the common collector and ground respectively Electrical characteristics Parameter Min. Typical Max. Unit Working voltage 4.5 5 5.5 VDC Digital input voltage（VCC=5V） 0 - 5 V Working current（VCC=5V） - 34 - mA Maximum Switch current - 2 - A Maximum Switch AC - 120 - VAC Maximum Switch DC - 24 - VDC Indicator Status lamp For NO and COM ports, when relay is connected, LED lamp will be ON; when relay is disconnected, LED lamp will be off. DEMO Connect S port of electronic brick of relay to D2 port of Arduino board, then connect COM and NO ports of relay in series to loop of LED, and we will use the following program to make LED lamp flash at intervals of 1s. 1 2 3 4 5 6 7 8 9 10 11 12 int relay = 2; void setup() { // initialize the digital pin as an output. pinMode(relay, OUTPUT); } void loop() { digitalWrite(relay, HIGH); // turn the relay on(HIGH is the voltage level) delay(1000); // wait for a second digitalWrite(relay, LOW); // turn the relay on by making the voltage LOW delay(1000); // wait for a second }