to be able to drive them, we require special current motorists. Motor relay board comes in to the image as a result of these needs. Engine relay board drives motors and relays by providing adequate present. It may drive one relay and four DC engines or one stepper motor at a time. The motor relay board eases the duty of interfacing motor that is external AC devices aided by the ATmega32 microcontroller. This has ULN2003 motorists for high present applications like motor driving and relay driving circuits for AC unit interfacing.
You can find three sections that are main a engine relay board.
Relay Motorist