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 are in need of unique present motorists. Motor relay board comes in to the photo due to these demands. Engine relay board drives engines and relays by providing enough present. It could drive one relay and four DC engines or one stepper motor at a time. The engine relay board eases the job of interfacing outside engine and AC products with all the ATmega32 microcontroller. This has ULN2003 motorists for high applications that are current motor driving and relay driving circuits for AC unit interfacing.

You will find three primary sections for an engine relay board.

Relay Motorist

Utilising the supplied relay circuit, 230V products may be managed. This area is effective for automating the on / off.

Engine Driver

The DC motor may be controlled making use of this area, there was 4 ULN2003 driver managed lines for driving engines and every provides enough present to regulate the DC motor.

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 slot 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 could be linked to 4 pins. * Use port pins 4,5,6&7 for engines in the region of motor D, C, B&A. * Set the input slot pin correspondingly to make ON/OFF the relay/motor.


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

The Jumper description can be as below for J4.

The relay and motor inputs are directly accessed by the header J5.

Terminal Obstructs

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

There are three terminal obstructs. A person is for the engine that is 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 9V that are internal is greater

Exterior Supply Block

12V – outside energy for motor GND – Ground

Energy Headers

There are 2 energy headers for sale in this board, J9 for 9V and J7 for 5V.

Engine Procedure

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

Stepper Engine

For the unipolar stepper engine, mail order wife link 4 lines to your engine terminals and a standard terminal towards the VCC. Put the jumper limit over 5, 6, 7 and 8 pins of J4 for connecting pins to your microcontroller slot. For a bipolar stepper engine, link 4 lines every single for 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 one of many engine terminals and VCC towards the typical. Link the jumper limit regarding the J4 for the pin that is corresponding.

Relay Procedure

The relay may 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 shall get in touch to the COM terminal through the relay OFF condition and NC will undoubtedly be attached to the COM terminal during ON condition. The relay could be used to get a handle on energy products working up to 230V /7 A.