so that you can drive them, we are in need of unique present motorists. Motor relay board comes to the image due to these demands. Engine relay board drives engines and relays by providing adequate present. It may drive one relay and four DC engines or one stepper motor at a time. The engine relay board eases the job of interfacing external engine and AC products aided by 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 parts for a motor relay board.

Relay Motorist

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

Engine Driver

The DC engine could be managed utilizing this part, there clearly was 4 driver that is ULN2003 lines for driving motors and every provides enough present to manage 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 power and 2 pins for ground

Linking the Board

* switch on the board SW1 that is using LED will glow. * Connect the slot connector to your 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 may be attached 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 is certainly a header that is alternate for accessing specific pins.

The Jumper description can be below for J4.

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

Terminal Obstructs

Terminal blocks are employed for linking engine, outside supply, and relay managed equipment.

There are three blocks that are terminal. One is for the engine which will be 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 is employed to get in touch relay inputs and outputs.

Pin plans in terminal obstructs are since below.

Relay Block

NC – Normally closed COM – Common NO – Ordinarily open

Engine Block

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

Exterior Supply Block

12V – outside energy 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 engine are interfaced to your 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 stepper that is unipolar, link 4 lines to your engine terminals and a standard terminal to your VCC. Place the jumper cap over 5, 6, 7 and 8 pins of J4 to get in touch pins towards the microcontroller port. For a 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 one of several engine terminals and VCC into the typical. Link the jumper limit regarding the J4 for the matching pin.

Relay Operation

The relay may be operated by shorting some of the very first four-port pin pairs of connector J4 with the aid of a jumper.

Relay has 3 terminals 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 are going to be linked to the COM terminal during ON condition. The relay may be used to get a handle on energy devices working up to 230V /7 A.