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Engine Relay Board Hookup Guide. As gear like engines and relays need high present, microcontrollers cannot drive them.

Engine Relay Board Hookup Guide. As gear like engines and relays need high present, microcontrollers cannot drive them.

to be able to drive them, we want special present motorists. Motor relay board comes in to the image as a result of these needs. Motor relay board drives motors and relays by providing adequate present. It may drive one relay and four DC engines or one motor that is stepper a time. The engine relay board eases the duty of interfacing motor that is external AC products using the ATmega32 microcontroller. This has ULN2003 motorists for high present applications like motor driving and relay driving circuits for AC unit interfacing.

You will find three sections that are main an engine relay board.

Relay Driver

Making use of the supplied relay circuit, 230V products may be managed. This area is effective for automating the off and on.

Engine Driver

The DC engine may be managed making use of this area, there clearly was 4 driver that is ULN2003 lines for driving engines and every provides adequate present to regulate the DC engine.

Exterior Interfaces

* Terminal block (3pin) –for linking relay IN and OUT * Terminal block(7pin) – for linking 4 lines of engine, 1 for energy and 2 pins for ground

Linking the Board

* switch on the board SW1 that is using LED will glow. * Connect the port connector into the standard slot. * Shunt the jumpers in J4. * Use jumper caps to pick port pins. First four pins (0, 1, 2&3) are relay selectors. The relay is linked to 4 pins. * Use port pins 4,5,6&7 for engines in the near order of engine D, C, B&A. * Set the input slot pin correspondingly to show ON/OFF the relay/motor.


There clearly was a header that is alternate for accessing specific pins.

The Jumper description is really as below for J4.

The relay and engine inputs may be straight accessed by the header J5.

Terminal Obstructs

Terminal obstructs are utilized for linking engine, outside supply, and relay equipment that is controlled.

There are three blocks that are terminal. A person is when it comes to find a bride legit engine which will be a 7-pin unit, a different one a 2-pin device to get in touch external 12V supply and 3-pin terminal block is employed allowing you to connect relay inputs and outputs.

Pin arrangements in terminal obstructs are since below.

Relay Block

NC – Normally closed COM – Common NO – Generally open

Engine Block

VCC – Supply from external 12V or internal 9V whichever is greater

Exterior Supply Block

12V – outside energy for motor GND – Ground

Energy Headers

There are two main energy headers obtainable in this board, J9 for 9V and J7 for 5V.

Engine Procedure

You will find 4 lines for engine control and both DC stepper and engine engine could be interfaced to your board. The engine may be interfaced to block that is terminal. The pins 2, 3, 4 and 5 are for engine lines.

Stepper Engine

For a unipolar stepper engine, link 4 lines into the engine terminals and a typical terminal towards the VCC. Place the jumper limit over 5, 6, 7 and 8 pins of J4 to get in touch pins to your microcontroller slot. For the stepper that is bipolar, link 4 lines every single associated with the terminals. Place the jumper limit over 5, 6, 7 and 8 pins of J4.

DC Engine

For DC engine, link the motor line to virtually any among the engine terminals and VCC into the typical. Link the jumper limit from the J4 for the matching pin.

Relay Procedure

The relay could be operated by shorting some of the four-port that is first pairs of connector J4 with the aid of a jumper.

Relay has 3 terminals in order to connect,

* NO – Normally available * COM – Common terminal * NC – Normally closed

Link the input in COM terminal. NO terminal will link into the COM terminal through the relay OFF condition and NC will undoubtedly be attached to the COM terminal during ON condition. The relay enables you to get a handle on energy products working up to 230V /7 A.