DescriptionThis is a relay shield that has 4 relays for controlling high current loads up to 3A with Arduino Uno or Mega. There are onboard NO (Normally Open) and NC (Normally Closed) terminal connectors for controlling devices that could not be directly controlled by Arduino’s digital IO pins. Relay can be useful in switching AC appliances such as fan, lamp, motors, solenoid valves, electromagnets, coils, etc.The standardized shield form factor enables a smooth connection with Arduino Uno, Mega and compatibles. The shield also has 4 LED indicators to indicate the on/off state of each relay.FeaturesOperating voltage : 5VHas ICSP extension pins4-channel relay fit on Arduino Uno, Mega form factorsLED indicators for each relay outputLoad capacitor : 3A 125VAC / 3A 24VDC (each relay)Has extension pins for IO WiringLabelMeaningConnectionRelay 11st channel relayConnected to Arduino digital pin 7Relay 22nd channel relayConnected to Arduino digital pin 6Relay 33rd channel relayConnected to Arduino digital pin 5Relay 44th channel relayConnected to Arduino digital pin 4NO1/2/3/4Normally-Open terminalConnect device to this for switching ON when relay is activatedCOM1/2/3/4Common terminalConnect to power sourceNC1/2/3/4Normally-Closed terminalConnect device to this for switching OFF when relay is activated
