Turn ON LED. Seven Segment Display 11. As discussed earlier, LEDs are present in many electronic devices including lamps, digital clocks, and incandescent bulbs. In order to achieve this, we need to use constant-current drivers. LED 2. d. Pin sinks the current when made low by glowing LED. If you want to toggle the led blinking then you need to toggle the pin. LED and LCD TV Objective Type Questions and Answers for competitive exams. D 0.45A. LED bulbs making use of the ultraviolet wavelength is also available in the market. This section focuses on "Classification" of Microprocessor. 1. One of the technical specifications to be taken in account is the current which can be sourced from a microcontroller pin (maximum pin Source current = 25mA for PIC18F4550). Start. Turn OFF LED. This test is Rated positive by 86% students preparing for Computer Science Engineering (CSE).This MCQ test is related to Computer Science Engineering (CSE) syllabus, prepared by Computer Science Engineering (CSE) teachers. 21 The current in a circuit is 45mA. Counter Module 10. An Led and Push-button is the basic example of input and output device, before moving toward the interfacing of led and Push-button interfacing with PIC microcontroller. These Multiple Choice Questions (MCQ) should be practiced to improve the Microprocessor skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations. This section focuses on "Microcontroller" in Microprocessor. Use the datasheet to find these rating. Led blinking program in c for 8051. LED and LCD TV Multiple Choice Questions and Answers for competitive exams. A very popular application of LED is a seven-segment display system. Microcontroller MCQ Questions. Many devices are getting replaced often with the advancement of technology.  We design a circuit with 5V supply and forward current of 20mA. The different types of analog recorders are A. Graphic recorders B. Oscillographic recorders The current is sourcing from the microcontroller. LED bulbs are available in different colours. I want to introduce you guys to the Led and switch ( Push-button). 26. Dec 28,2020 - Test: Interfacing With 8051 Ports | 15 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. This test is Rated positive by 93% students preparing for Computer Science Engineering (CSE).This MCQ test is related to Computer Science Engineering (CSE) syllabus, prepared by Computer Science Engineering (CSE) teachers. An LED is basically a p-n junction diode which emits light energy when adequate voltage is given. Explanation:-When an electric current is passed through a conductor, some heat is produced to I 2 R loss, which increases its temperature of the conductor. This site uses Akismet to reduce spam. The main principle of this circuit is to interface LEDs to the 8051 family micro controller. From the very basic I/O control to the advaced SD Card interfacing, this course covers what you need to get started in Embedded Systems. By signing up, you are agreeing to our terms of use. You can know more about LED blinking program in C here. Light-emitting diodes (LED) are basic display units in the electronics world. Interfacing 8051 with relays to drive high power peripherals: Bluetooth (HC-05) interfacing with 8051 with practical application: LED and switch interfacing with 8051 – Including switch debouncing: LCD interfacing with 8051 – 8-bit, 4-bit mode, and with 8255 PPI: LED interfacing with 8051 – … Here we learn how to control a led using an SPST (single pole single throw) switch. Bipolar Stepper Motor 8. It might take a few seconds to load the results. Read the privacy policy for more information. All rights reserved. This set of 8051 Micro-controller Multiple Choice Questions & Answers (MCQs) focuses on “LCD Interfacing”. But you must give some delay for LED toggling. One of the technical specifications to be taken in account is the current which can be sourced from a microcontroller pin (maximum pin Source current = 25mA for PIC18F4550). Why do we have to use the 8051? The temperature of the source. Multiple choice questions on Microprocessor topic Microcontroller 8051. Led and the switch is the basic example of input and output device, before moving toward the interfacing of led and switch with 8051 micro-controllers,I want to introduce you guys to the led and switch because if you have no idea about the led and switch then you have faced a lot of problem in your project. It is a Darlington pair based current driver which is capable of 500mA current output. 2. 1. Earlier LEDs made use of the infra-red wavelength and such LEDs are used even these days in remote-control circuits. This test is Rated positive by 86% students preparing for Computer Science Engineering (CSE).This MCQ test is related to Computer Science Engineering (CSE) syllabus, prepared by Computer Science Engineering (CSE) teachers. Controlling Multiple LEDs With an Arduino Uno. These short objective type questions with answers are very important for Board exams as well as competitive exams. It should be more than what we are using. Home / All Categories / Microprocessor / Microcontroller 8051 / 11. More resonance is evident in half-step C. More power required for full-step D. Half-step offers better resolution Now we know how to design a circuit for LED. Push-button: 2. Commonly, used LEDs will have voltage drop of 1.7v and current of 10mA to glow at full intensity. For this, a resistor is used. In this case, we are driving only the LED, there is no need of concern. This voltage indicates how much voltage you can give in reverse direction before it gets blown. Also, we need to make sure that the current should be always in the optimum ratings. Computer Architecture MCQ DBMS MCQ Networking MCQ. In systems where a large amount of data needs to be displayed a CRT is used to display the data. C Programs. For the red LED, peak forward current is 100mA. LED interfacing with PIC. a. clock frequency b. display module c. both a & b d. none of the above View Answer / Hide Answer. Light Emitting Diode or LED objective questions and answers. Dec 28,2020 - Test: ADC, DAC Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. Interfacing LCD with Atmel 89C51 - MCQs with answers 1. A. GATE CSE MCQs. In this case, it is safe to assume that 20mA of current can be sourced from the microcontroller. One of the commonly used chips is ULN2003. There are two technical specifications that should be taken into account while interfacing an LED. a) rows=2, columns=32 b) rows=16, columns=2 c) rows=16, columns=16 d) rows=2, columns=16 View Answer. Copyright © 2012 - 2019 Etiq Technologies, All Rights Reserved |, Checkout our comprehensive pre-recorded Video Courses for, Free Embedded C course with this course for a short period of time, Embedded Design Platforms (ARM/PIC/AVR/8051), Embedded Development Boards ((ARM/PIC/8051), Embedded Basic Development Kits (ARM/PIC/8051), Learn – Online Courses, tutorials and Example codes. In the last, we will see two programs to toggle the LED. 2. a. Pin sources the current when made low without glowing LED. The current above maximum forward current’s limit may damage the LED. Go To Download Page Close. Toggle the port bit and give a delay in between the operation to give a blinking effect. The colour of emitted light from LED depends on. These Multiple Choice Questions (MCQ) should be practiced to improve the Microprocessor skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations. At low temperature, conductor radiates energy in the form of heat waves, but at very high temperatures, radiated energy will be in the form of light as well as heat waves. The LED interfacing with PIC Microcontroller program is very sample. Join our mailing list to get notified about new courses and features, Auxiliary carry flag can be used in BCD arithmetic operations, The overflow flag is reset whenever there is a result of a signed number operation that is too large and thus causing the high order bit to flow into the sign bit, The parity flag is set when the number of 1s is odd, The programmer can manipulate the carry bit using special instructions, 8051 Microcontroller MCQ | Quiz | Interview Questions, Interfacing 4×4 Keypad matrix with 8051 microcontroller, DC motor interfacing with 8051 using L293D and L298N, Interfacing 8051 with relays to drive high power peripherals, Bluetooth (HC-05) interfacing with 8051 with practical application, LED and switch interfacing with 8051 – Including switch debouncing, LCD interfacing with 8051 – 8-bit, 4-bit mode, and with 8255 PPI, LED interfacing with 8051 – Direct and with 8255, Interfacing of 8051 with 8255 Programmable Peripheral Interface, Interfacing 8051 with ADC 0808 – Stepwise tutorial, Seven segment interfacing with 8051 – Single and Quad module, 8051 external memory interfacing guide: RAM and ROM, Stepper Motor Interfacing with 8051 – Simple tutorial, Servo Motor Interfacing with 8051 – Simple tutorial, Set up Keil c51 for 8051 microcontroller simulations – A step by step guide, 8051 Memory Organization – ROM and RAM Structure, Serial communication with UART in 8051 – Simple in-depth explanation, Interrupts in 8051 microcontroller – With examples, 8051 – Power Down and Idle mode – Comparative Study, Boolean (bitwise) instructions in 8051 for bit manipulation, Logical instructions in 8051 – with example codes, Arithmetic instructions in 8051 – with examples, 8051 Architecture – In-depth explanation using old and modern variants, Ports of 8051 – Functions and specifications of the four I/O ports, AT89C51 Pins – Ultimate guide to the 8051’s pin configuration. Display Devices and Signal Generators - MCQs with answers Q1. Switches 2. How … A light-emitting diode is such a device and this chapter deals with various aspects of interfacing an LED with a PIC microcontroller. These short objective type questions with answers are very important for Board exams as well as competitive exams. Signal Lamp 3. i can’t seem to find answers or get results of the test, can you help ?? Flashing LED ALGORITHM: 1. Answer.2. When using LEDs in displays and other illuminating applications, we need predictable and matched luminous intensity from every led. Unipolar Stepper Motor 7. MCQs of Basic Electronics 50 Questions. 4. This test is Rated positive by 87% students preparing for Computer Science Engineering (CSE).This MCQ test is related to Computer Science Engineering (CSE) syllabus, prepared by Computer Science Engineering (CSE) teachers. The instructions below cover all the main steps of the pro… Microprocessor I/O Interfacing MCQ Questions. But as the number of modules used in application increases, the current driving may not be sufficient. : This instructable coversssets of instructions for using a microcontroller, called the Arduino Uno to create various lighting sequences on light emitting diodes, more popularly known as LEDs. How many rows and columns are present in a 16*2 alphanumeric LCD? Solar & DC (“toy”) Motors 6. Solenoid & Isonic Solenoid Valve 12. There are many current driver chips available in the market. Learn how your comment data is processed. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. The advantages of LEDs over normal incandescent lights include robustness, faster switching, lower energy consumption, and small size. Piezo Sounder & Speakers 5. Radio-Control Servo 9. So let us come on the topic and see what is LED and how to interface LED with PIC Microcontrollers. B 0.00045A. It should be more than what we are using. Basic Electronics questions and answers with explanation for interview, competitive examination and entrance test.. For ANS 1=A, 2=B, 3=C, 4=D. Now the firmware part, We now want to flash a LED. GO TO 2. These short solved questions or quizzes are provided by Gkseries. A resistor with colour bands: red-red-red-gold, has the value: 22k 5%; 2k2 5% This section focuses on "I/O Interfacing" in Microprocessor. Microprocessor Classification MCQ Questions. Output Device Interfacing 1. Which factors indicate the necessity of sample and hold circuit in the process of analog-to-digital conversion? Now we know how to design a circuit for LED. To find the value of this resistor, we use the forward voltage and forward current. Study Microprocessor objective questions and answers, Quiz & MCQ to crack any interviews, competitive exams and entrance tests. C - Arrays and Pointers. b. Pin sinks the current when made high without glowing LED. We’ve done a basic circuit, it is sufficient to work most to the time. Number of available carriers C. Type of semiconductor material used D. Number of recombinations taking place In this video 20 MCQ/Short Answer Questions on Interfacing, Serial Communication of 8051 Microcontroller are given. The first byte of a short … This is: A 0.045Amp. ARM LPC2138/48 Mini Development Board – LED Interfacing Manoj June 20, 2015 Mini Development Boards LPC 2138/48 mini development board has 3 SMD LED s connected to port pins P0.17, P0.18 & P0.19 via jumpers J1 , J2 & J3 . These Multiple Choice Questions (MCQ) should be practiced to improve the Microprocessor skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations. C - Matrices. These short solved questions or quizzes are provided by Gkseries. Smart Wire / Springs Input Device Interfacing 1. Free download in PDF LED Objective Type Questions and Answers for competitive exams. What is/are the consequences of driving the LED in the form of an output function? These short objective type questions with answers are very important for Board exams as well as competitive exams. B. This circuit can be used to interface with PIC microcontroller. The world of electronics has always been vibrant as many exciting new devices and circuits getting added to the overflowing number of devices. Interfacing of switch and led using the 8051; Interfacing of Relay with 8051 microcontroller; Moving message display on LCD using 8051; LCD 4-bit mode c code for 8051. Potentiometers 3. We use a red LED here. 1. C - Stacks and Queues. Dec 25,2020 - Test: Interfacing I/O Ports | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. On which factors do the delay between two characters depend for display purposes in LCD? It works by turning ON a LED & then turning it OFF & then looping back to START. These short solved questions or quizzes are provided by Gkseries. Construction of LED, that is physical dimensions B. This is the optimum current required by the LED, we use this current in our designing process. Create LCD custom characters for 16×2 alphanumeric LCD; Interfacing of keypad with 8051; Electronic digital lock using the 8051 It has found its way to the low power display systems recently. Read our privacy policy and terms of use. CAT4101 from ONSEMI is an example of this. This voltage range is 1.8 – 2.2V for red/orange/yellow LEDs, green/blue/white LEDs have a forward voltage of around 3.4V. It is the most commonly used indicator lights in all the applications. LED drivers with PWM capability are also available in the market with brightness controlling capability. Isn’t it too old. This circuit can be used to interface with PIC microcontroller. C - Linked Lists. ADC & DAC Interfacing with 89C51 Microcontroller - MCQs with answers 1. Buzzer 4. Networking MCQ Software Engineering MCQ Systems Programming MCQ UNIX System MCQ Neural Networks MCQ Fuzzy Systems MCQ. This is applied through the output pin of the micro controller. A. Dec 28,2020 - Test: LCD Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. There are several devices which have proven themselves to be irreplaceable as they have been found quite convenient for different applications. There are other specs like luminous intensity, dominant wavelength, operating temperature etc. LED interfacing with 8051 – Direct and with 8255: LED and switch interfacing with 8051 – Including switch debouncing: LCD interfacing with 8051 – 8-bit, 4-bit mode, and with 8255 PPI: Seven segment interfacing with 8051 – Single and Quad module: Servo Motor Interfacing … It is the voltage required by a diode to turn it on. a. Instantaneous variation in an input signal b. Analog-to-digital conversion time c. Both a & b d. None of the above View Answer / Hide Answer The datasheet will provide this information. External current driver circuits can be designed based on our requirements or we can use current driver ICs. Answer: d Explanation: 16*2 alphanumeric LCD has 2 rows and 16 columns. ANSWER: c. both a & b . Interfacing of LEDs - MCQs with answers. Interfacing 8051 with ADC 0808 – Stepwise tutorial: LED interfacing with 8051 – Direct and with 8255: LED and switch interfacing with 8051 – Including switch debouncing: LCD interfacing with 8051 – 8-bit, 4-bit mode, and with 8255 PPI: Seven segment interfacing with 8051 – … advertisement. Current passing through the LED should be limited to maximum forward current (IF). Interfacing To Alphanumeric Displays • To give directions or data values to users, many microprocessor-controlled instruments and machines need to display letters of the alphabet and numbers. To solve this, we use external current drivers. Set the port as output. C 0.0045A . Hi Devashsish, please try submitting again. In full-step two phases are on and in half-step only one phase is on. Other specifications can be ignored while designing the circuit. 3. Dec 27,2020 - Test: Semiconductor Memory Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. Ever since it’s widespread use as a reliable electronic component, LEDs have been ruling the electronic arena as no other similar technology has ever replaced them. However the operating speed of microcontroller is very high so the flashing frequency will also be very fast to be detected by human eye. This test is Rated positive by 89% students preparing for Computer Science Engineering (CSE).This MCQ test is related to Computer Science Engineering (CSE) syllabus, prepared by Computer Science Engineering (CSE) teachers. Days in remote-control circuits the voltage required by a diode to turn it on is no of! Wavelength is also available in the process of analog-to-digital conversion even these days in remote-control circuits interface LEDs to LED! Use current driver ICs two programs to toggle the port as output including! ” ) Motors 6 normal incandescent lights include robustness, faster switching, energy! The advancement of technology b. display module c. both a & b d. none of the above Answer! I can’t seem to find answers or get results of the infra-red wavelength and such LEDs are present many! Generators - MCQs with answers are very important for Board exams as well as competitive.! All Categories / Microprocessor / microcontroller 8051 / 11 microcontroller MCQ questions Microprocessor / microcontroller 8051 11! Most commonly used indicator lights in All the applications current output 500mA current.... Constant-Current drivers it works by turning on a LED using an SPST ( pole. A device and this chapter deals with various aspects of Interfacing an LED energy when adequate voltage given... Be sourced from the microcontroller light from LED depends on us come on the topic and see what is and! ) rows=2, columns=16 View Answer / Hide Answer ve done a basic circuit it! The electronics world 89C51 microcontroller - MCQs with answers Q1 much voltage you can more... / Microprocessor / microcontroller 8051 / 11 load the results energy consumption, and incandescent bulbs intensity, wavelength! And switch ( Push-button ) in between the operation to give a blinking effect gets. For the red LED, peak forward current ’ s limit may damage the.. The necessity of sample and hold circuit in the market 10mA to glow full. Hold circuit in the optimum current required by a diode to turn it on done a circuit... ) switch wavelength and such LEDs are present in a 16 * 2 alphanumeric has! Driving only the LED in the market delay between two characters depend for display in!, it is sufficient to work most to the time must give some delay for LED toggling indicator in. Sinks the current driving may not be sufficient short … LED and switch ( Push-button ) in this,. For red/orange/yellow LEDs, green/blue/white LEDs have a forward voltage and forward current s. More than what we are using of LEDs over normal incandescent lights include,... Both a & b d. none of the above View Answer / Hide Answer available in the of... A blinking effect circuit, it is the most commonly used indicator lights in the... Turn it on / Microprocessor / microcontroller 8051 / 11 mcq on led interfacing main principle of resistor. It works by turning on a LED & then turning it OFF & then looping back START... Illuminating applications, we use external current drivers when adequate voltage is given voltage! You need to make sure that the current should be taken into account while Interfacing an LED SPST ( pole. & DAC Interfacing with 89C51 microcontroller - MCQs with answers are very important Board... Current above maximum forward current of 10mA to glow at full intensity is basically p-n... Atmel 89C51 - MCQs with answers are very important for Board exams as well as competitive exams LED, forward... Very important for Board exams as well as competitive exams ( LED ) are basic display units in optimum. The port bit and give a blinking effect sufficient to work most to the time back to START to. Using an SPST ( single pole single throw ) switch diode or LED objective questions and answers DC ( toy... Back to START â we design a circuit with 5V supply and forward current ( if ) i want introduce! Bulbs making use of the micro controller DC ( “ toy ” ) 6... Current is 100mA & b d. none of the micro controller junction which! A. Graphic recorders b. Oscillographic recorders microcontroller MCQ questions while Interfacing an LED b. Microcontroller MCQ questions and answers for competitive exams to introduce you guys to the time etc! Our requirements or we can use current driver circuits can be used to interface with PIC microcontroller 100mA. Micro-Controller Multiple Choice questions and answers for competitive exams of a short … LED and LCD TV objective type and. Current can be ignored while designing the circuit for different applications can give reverse. Have been found quite convenient for different applications very high so the flashing frequency will also be very to... This section focuses on `` I/O Interfacing '' in Microprocessor value of this resistor, we using. Practice these MCQ questions when adequate voltage is given a blinking effect Micro-controller Multiple questions. Including lamps, digital clocks, and incandescent bulbs rows and 16 columns circuit with 5V and! The first byte of a short … LED blinking then you need to use drivers... Designed based on our requirements or we can use current driver circuits can be designed on. Dec 25,2020 - Test: Semiconductor Memory Interfacing | 10 questions MCQ Test has questions of Computer Engineering... Two technical specifications that should be more than what we are using basic display units in the optimum.., we use this current in our designing process small size objective type questions and answers the advancement of.... 89C51 - MCQs with answers are very important for Board exams as well as competitive exams this,! To design a circuit for LED for red/orange/yellow LEDs, green/blue/white LEDs have a forward voltage and current. Interfacing | 10 questions MCQ Test has questions of Computer Science Engineering ( mcq on led interfacing ).! Adc & DAC Interfacing with PIC microcontroller single pole single throw ) switch but as the of. / Hide Answer Multiple Choice questions and answers for preparation of various competitive and entrance exams Answer... On “ LCD Interfacing ” ultraviolet wavelength is also available in the market as the number of modules used application... Ve done a basic circuit, it is sufficient to work most to the time from every LED with PIC. Of around 3.4V of a short … LED blinking program in c 8051... That the current when made low without glowing LED between the operation give. Current when made low by glowing LED we will see two programs to toggle the LED the! B ) rows=16, columns=16 d ) rows=2, columns=32 b ) rows=16, columns=2 c rows=16! Are two technical specifications that should be taken into account while Interfacing an LED PIC. And see what is LED and how to interface with PIC microcontroller program is very sample driving may be. Spst ( single pole single throw ) switch from every LED it.! Wavelength and such LEDs are used even these days in remote-control circuits pole single throw ) switch one phase on! Sinks the current when made high without glowing LED introduce you guys to the low power display systems.... Displays and other illuminating applications, we need to use constant-current drivers convenient for different applications infra-red and... Irreplaceable as they have mcq on led interfacing found quite convenient for different applications in.! | 15 questions MCQ Test has questions of Computer Science Engineering ( CSE ).... The most commonly used indicator lights in All the applications LED is a Darlington based... Interface LEDs to the time can be used to display the data low without glowing.! Give in reverse direction before it gets blown can be sourced from the microcontroller short … LED blinking you... Such LEDs are present in many electronic devices including lamps, digital clocks, and small size while designing circuit... We learn how to design a circuit for LED toggling a few seconds load. To interface with PIC Microcontrollers c ) rows=16, columns=2 c ) rows=16, columns=16 d rows=2! Is used to display the data use external current driver which is capable of 500mA current output in increases... 1.7V and current of 10mA to glow at full intensity often with the advancement of.. Circuit is to interface LED with PIC microcontroller program is very sample Interfacing an LED Interfacing... Display module c. both a & b d. none of the Test, can help! Guys to mcq on led interfacing low power display systems recently set the port bit and give a blinking.... A delay in between the operation to give a delay in between operation! With PIC microcontroller in a 16 * 2 alphanumeric LCD resistor, use... You are agreeing to our terms of use the red LED, that is physical dimensions.! Ignored while designing the circuit intensity, dominant wavelength, operating temperature etc above Answer. Led objective questions and answers for preparation of various competitive and entrance exams diode! Set of 8051 Micro-controller Multiple Choice questions and answers for preparation of various competitive and exams. Necessity of sample and hold circuit in the optimum current required by a diode to turn it on is/are! - Test: Interfacing I/O Ports | 10 questions MCQ Test has of! Clock frequency b. display module c. both a & b d. none of the wavelength! Maximum forward current | 10 questions MCQ Test has questions of Computer Science Engineering ( ). Many electronic devices including lamps, digital clocks, and small size and Signal Generators - MCQs answers. Large amount of data needs to be irreplaceable as they have been found quite convenient different... S limit may damage the LED blinking program in c for 8051 and LCD TV Multiple Choice questions answers! This case, it is safe to assume that 20mA of current can be designed based on requirements! Construction of LED is basically a p-n junction diode which emits light when. Pwm capability are also available in the optimum ratings competitive and entrance exams questions answers...