Relay Shield 5V 4-channel 4CH relay QUAD module Arduino UNO R3

dimensions: 7.6 x 1.3 x 0.5 cm Relay Shield (ie 5V Quad lss module) is a small current power signal control equipment commonly used electronic module, which allows single-chip high-power control devices are widely used in the SCM system to make project smart home; and the use of various types of motherboards can be inserted directly into the Arduino, eliminating patch cable problems. Module features are as follows: 1. Standard Arduino Shield interfaces and shape 2. Can continue to stack other Arduino expansion boards 3. 3 M3 screw positioning holes for easy installation 4. High Drive (5V or 3.3V) normally open contact closure 5. Onboard relay indicator (red) Relay Shield Interface: (the last picture show) Relay: sky- 5V DC relay , model HJR-4102-L-5V, which Relay1 behalf of the 1st relay , the other and so on. Power Interface : 5V DC power interface Indicator: four lights are red when the relay is driven high , the corresponding indicator will light up . Relay Terminals: Terminal hi