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

so that you can drive them, we require unique drivers that are current. Motor relay board comes into the photo as a result of 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 aided by the ATmega32 microcontroller. It has ULN2003 motorists for high applications that are current 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 products may be managed. This area is useful for automating the off and on.

Engine Driver

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

Exterior Interfaces

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

Linking the Board

* switch on the board making use of SW1, power LED will glow. * Connect the slot connector into the standard 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 could 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 make ON/OFF the relay/motor.


There was a alternative header j3 for accessing specific pins.

The Jumper hop over to the website description can be below for J4.

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

Terminal Obstructs

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

There are three blocks that are terminal. One is for the engine that is a device that is 7-pin 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 plans in terminal obstructs are as below.

Relay Block

NC – Normally closed COM – Common NO – Usually 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 2 energy headers for sale in this board, J9 for 9V and J7 for 5V.

Motor Procedure

You can find 4 lines for engine control and both DC stepper and engine engine may be interfaced into the board. The motor are 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 towards the engine terminals and a typical terminal to your VCC. Place the jumper limit over 5, 6, 7 and 8 pins of J4 to get in touch pins towards the microcontroller slot. For a stepper that is bipolar, link 4 lines every single regarding 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 several engine terminals and VCC to your typical. Link the jumper limit from 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 towards the COM terminal through the relay OFF condition and NC are going to be linked to the COM terminal during ON condition. The relay could be used to get a grip on energy products working up to 230V /7 A.

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