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 require unique present motorists. Motor relay board comes to the image due to these demands. Motor relay board drives engines and relays by providing adequate present. It could drive one relay and four DC engines or one stepper motor at a time. The engine relay board eases the duty of interfacing motor that is external 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 primary parts for a engine relay board.

Relay Motorist

Making use of the supplied relay circuit, 230V products could be managed. This part is useful for automating the on / off.

Engine Driver

The DC engine are managed making use of this area, there was 4 ULN2003 driver managed lines for driving motors and every provides adequate present to regulate the DC engine.

Exterior Interfaces

* Terminal block (3pin) –for connecting 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 to your default slot. * Shunt the jumpers in J4. * Use jumper caps to pick pins that are port. First four pins (0, 1, 2&3) are relay selectors. The relay may be attached to 4 pins. * Use port pins 4,5,6&7 for engines in the region of engine D, C, B&A. * Set the input slot pin correspondingly to make ON/OFF the relay/motor.


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

The Jumper description can be as below for J4.

The relay and engine inputs could be straight accessed because of the header J5.

Terminal Blocks

Terminal obstructs can be used for linking engine, outside supply, and relay equipment that is controlled.

There are three terminal obstructs. One is when it comes to engine that is a 7-pin device, a different one a 2-pin device to get in touch external 12V supply and 3-pin terminal block can be used to get in touch 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 higher

External Supply Block

12V – External power for motor GND – Ground

Energy Headers

There are two main energy headers for sale 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 motor may be interfaced to your board. The engine could be interfaced to terminal block J8. The pins 2, 3, 4 and 5 are for engine lines.

Stepper Engine

For a stepper that is unipolar, link 4 lines to your engine terminals and a standard terminal into the VCC. Put the jumper limit over 5, 6, 7 and 8 pins of J4 in order to connect pins to the microcontroller slot. For a stepper that is bipolar, link 4 lines to every regarding the terminals. Place the jumper limit over 5, 6, 7 and 8 pins of J4.

DC Motor

For DC engine, link the motor line to virtually any one of many engine terminals and VCC to your typical. Link the jumper limit in the J4 for the matching pin.

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 link to the COM terminal through the relay OFF condition and NC is likely to be attached to the COM terminal during ON condition. The relay could be used to get a grip on power products working up to 230V /7 A.

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