In this project, a MATLAB platform to control up to four electrical equipment is presented.
Controlling electrical equipment from a remote location using a control panel is employed in many applications. An important application is in a process plant where an operator in a control room, sitting in front of a computer terminal and running a human-machine interface (HMI) application program for process monitoring and controlling, can effectively send hard, real-time control commands/signals to multiple actuators present on the field. A graphical user interface (GUI)based HMI application enhances the user-friendliness of such an approach.
The authors’ prototype and the MATLAB-based GUI front panel are shown in Figs 1 and 2, respectively.
Circuit and working
Components used for this project are described below.
Arduino Uno board. Arduino Uno is an AVR ATmega328P microcontroller (MCU)-based development board with six analog input pins and 14 digital I/O pins. The MCU has 32kB ISP flash memory, 2kB RAM and 1kB EEPROM. The board provides the capability of serial communication via UART, SPI, and I2C. The MCU can operate at a clock frequency of 16MHz. In this project, digital I/O pins 9, 10, 11 and 12 of Arduino are configured as output pins.
SPDT relay. A relay is an electromechanical switch. Relays used here are of single-pole, double-throw (SPDT) type. In this type of relay, the output side has three terminals: normally-open (NO), normally closed (NC) and common (C).
When the relays are not energized, NC and C terminals are short-circuited, and NO and C terminals are open-circuited. When the relay coil is energized, NC and C terminals are open-circuited, and NO and C terminals are short-circuited. The prototype of the relay board is shown in Fig. 3.
This story is from the June 2019 edition of Electronics For You.
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This story is from the June 2019 edition of Electronics For You.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
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