Standard and shape Arduino Shield interfaces
continue to stack other Arduino expansion boards
3 M3 screw positioning holes for easy installation
High units (5V or 3.3V) closing of the normally open contact
Onboard indicator (red)
dimensions: 7.6 x 1.3 x 0.5 cm
Relay Shield (ie 5V Quad less 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.
When using the Arduino UNO board connected to it, perches the UNO USB interface is extremely high, should avoid green terminals are shorting its shell.
1 x Four-channel Relay Shield