Question

How many pins are present in the Relay (Dual Channel) Module?

(a) 12

(b) 220

(c) 13

(d) 50

I got this question in examination.

My question is taken from Relay (Dual Channel) Module in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

Correct answer is (c) 13

To explain: The Relay (Dual Channel) Module has 13 pins which includes the 2 Vcc’s, 2 GND’s, IN1 and IN2 which are the two input channels, 2 NC’s, 2 NO’s and 2 COM’s. All these pins have very specific functions and input patterns which need to be connected in perfect order in order for the module to function properly.