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


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

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so that you can drive them, we require unique drivers that are current. Motor relay board comes to the photo due to these needs. 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 task of interfacing outside engine and AC products 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 will find three sections that are main an engine relay board.

Relay Motorist

Utilising the supplied relay circuit, 230V devices is managed. This part is effective for automating the off and on.

Engine Driver

The DC motor may be managed applying this part, there clearly was 4 ULN2003 driver managed lines for driving motors and every provides enough present to manage 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 online bride jumper caps to pick port pins. First four pins (0, 1, 2&3) are relay selectors. The relay may be 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 is certainly a alternative header j3 for accessing specific pins.

The Jumper description is really as below for J4.

The relay and motor inputs could be straight accessed by the header J5.

Terminal Obstructs

Terminal obstructs are employed for linking engine, external supply, and relay controlled equipment.

There are three blocks that are terminal. One is for the engine that is a 7-pin unit, a different one a 2-pin device for connecting external 12V supply and 3-pin terminal block is employed allowing you to connect relay inputs and outputs.

Pin plans in terminal obstructs are since below.

Relay Block

NC – Normally closed COM – Common NO – Usually open

Engine Block

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

Exterior Supply Block

12V – External energy for motor GND – Ground

Energy Headers

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

Engine Procedure

You will find 4 lines for motor control and both DC stepper and engine engine could be interfaced into the 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 stepper that is unipolar, link 4 lines towards the engine terminals and a standard terminal into the VCC. Put the jumper limit over 5, 6, 7 and 8 pins of J4 for connecting pins towards the microcontroller slot. For a bipolar stepper engine, 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 to your typical. Link the jumper limit in the J4 for the pin that is corresponding.

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