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Wednesday, August 17, 2011

Elevator Lift control for three stories with microcontroller 8051

Three stories Lift or Elevator controller with microcontroller At89c51

In this project, we  will learn circuit design for a elevator, how to develop a three stories passenger lift or cargo lift using microcontroller at89c51. This is a modal of simple lift or elevator in which a building is assumed which have three floors :
Floor # 0 : The basement (A basement is one or more floors of a building that are either completely or
partially below the ground floor. )
Floor # 1: The ground floor
Floor # 2: The ist floor
There is a cabin of lift or elevator which will be moved up or down among different floors with the help of a motor. In this project of lift or elevator a single motor is used which will move the cabin up or down. Thus we have to learn about the control of this motor which is responsible of lift cabin movement on right time in right direction.
There are three floors in the building, thus lift cabin has to moves between these floor, for floor detection and to generate the arrival of any floor, some sensor are used. The floor detection sensors are limit switches which could be proximity switches. The proximity switches are sensors which changes the stat of a signal when metallic piece comes near them. The Principles of operation of inductive proximity sensors used in PC control, microcontroller or microprocessor projects and automation systems are as a proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. or in other words we can say that a proximity sensor often emits an electromagnetic or electrostatic field, or a beam of electromagnetic radiation and looks for changes in the field or return signal. The proximity sensors are the best for the detection of floor and could be used in this project. Thus, we will use three proximity sensors for three stories elevator project, one proximity sensor on each floor. These sensors have to be aligned with each other, such a way that, all sensors should be placed on equal distance from floor and these should be mounted to detect the bottom edge of lift cabin. By considering above precaution in the installation of sensors, lift cabin will stop on each floor correctly and doors of cabin and floor will be automatically aligned.
Three signals will be generated from within the lift cabin: these could be push buttons and will be used to request the lift to go on desire floor. The lift cabin will have three push switches for this purpose, one for each floor.7-segment led indication of lift system circuit design
Three signals will be generated outside the lift cabin, one from each floor. Again, these would be push buttons and there purpose will be to call the lift on desired floor, if it is not currently present there.
The status of lift will be indicated with the help of seven segment display. One seven segment display will be install on each floor; which will tell the current location of the lift. following display pattern could be visible on seven segment display of lift project:
0 : It means lift or elevator is on floor # 0 which is basement.
1:  It means lift or elevator is on floor # 1 which is ground floor.
2:  It means lift or elevator is on floor # 2 which is first floor.
3:  This will indicate that lift is just powered up and it is going to its home position which basement. on reaching the basement, display will show 0.
The seven segment circuit is separate from main controller circuit of lift. The power supply of master controller circuit, and three floor indicator circuits (LED seven segment display) will be separate and communication between these will be through optocouplers.
In this project we can use L817 or 4n35 optocouplers. I used L817 optocoupler with no special reason. Please note that the inputs of the master controller will also be connected to microcontroller 8051 through optocouplers like L817. Although, i have not shown the optocouplers for input signals in the circuit diagram with the assumption that students will use these by their own.
The circuit diagram of Elevator Lift control for three stories with microcontroller 8051 is as under:-
Elevator Lift control for three stories with microcontroller 8051 circuit design for a elevator

KEIL C51 code for lift project for three stories using microcontroller 8051 family.

Download software/ code written for microcontroller 8051 Elevator Lift control for three stories with microcontroller 8051
Elevator Lift control for three stories with microcontroller 8051

MICRO CONTROLLER BASED MULTI STORY CAR PARK SYSTEM pc based robot projects using microcontroller AT89C2051 pdf file of car parking system using a plc SENSOR FOR SENSING A CAR WHEN ENRERING A CAR PARK www.8051 program - design lift circuit multi-floor and multi stories bulding circuit design for a elevator www.the basic programming of edsim 8051(design of lift using flow chart)


  1. Dear sir,

    First of all I'm happy to find a guide to my project.

    Actually I'm a final year student of BE EEE. I like to do final year project in home automation using Embedded system, because i know basics about 8051 microcontroller, and also i have done small gadgets using 8051 microcontroller, As a mini project I have done Automatic electrical appliances controlling system in real time using RTC (real time clock). I would like to add some more concepts in Home automation for the Final year project, So please suggest me some Ideas to do in Home automation.
    Also i need to intrerface the ZigBee sir, So please kindly explain how to interface ZigBee with C Code, and kindly please provide some suggestions for my final year project (Home automation).

    And also I'm interested in listening the online Lecturers about microcontrollers. So Please provide that details also.

    I will look forward for your reply.

    Thank you very much sir.

  2. @ S.Premkumar
    It is nice idea to do final project on microcontroller 8051 for home automation and control. As you said, you have basic working knowledge about microcontrollers and you have done some small projects.
    You will surly do this one also. for ideas you can scan my blog, i hope you will find some useful information about different projects of microcontrollers.
    I have not use ZigBee so far, so i can not suggest you about it.

    If you make final proposal and need help, ask here, if i could, i will help you.

  3. hello sir,
    thanks a lot for a gsm modem interfearance post.....

  4. dear sir,
    tnkx a lot for ur gsm modem post....
    its awesome n m working on it...

  5. dear sir,
    tnk u for ur gsm modem post..
    i m currently working on this project...

  6. dear sir,
    tnk u for ur gsm modem post..
    i m currently working on this project...

  7. Sir,
    I had asked you about three floor elevator system before.
    your reply and circuit helped me a lot.
    we made some changes in circuit as we just wanted to demonstrate the logic.
    I have mailed you the circuit which i have designed and the c code which i have written.
    can you help me with following points :
    1. what to do with port 3 of 89c51 if it is not used
    2. what about PSEN'.ALE,RST,EA'/VPP pins? I am not using any external memory device.
    3. are the LCD connections okay?
    the Keil C51 (c to hex converter we are using) dosen't support lcd.h file
    Hence, I need your help with displaying code(eg. i need to display current floor and up/down motion of the elevator, then which function should i write? )
    also tell me if there are any changes you would like to suggest in c code.
    thanking you
    Rucha G.

    1. hi I m final year student and my project is Lift controller using 8051 microcontroller so do u have ant idea.
      plz help me if u have any relevant stuff for this project....

  8. Sir, we want a circuit diagram and programming for elevator doors,in which doors will automatically open for few seconds when elevator reaches at desired floor, and then they automatically close.And if another person or obstacle comes so doors again open for another few seconds then closes. And show the connection of this circuit with the previous circuit that you have already provided for elevator.

  9. Sir, we want a circuit diagram and programming for elevator doors,in which doors will automatically open for few seconds when elevator reaches at desired floor, and then they automatically close.And if another person or obstacle comes so doors again open for another few seconds then closes. And show the connection of this circuit with the previous circuit that you have already provided for elevator.

  10. @ Ali Rizwan :-
    I can help you to develop a full automatic elevator control including the door auotmation. But before this, you have to give some very basic information about your project such as:-
    1. How many floor are there in the building whose lefit or elevator program is required.
    2. The door of lift required to control as you said, but what about the doors of each floor? How the doors of each floor will be controlled and syncronized with the door of lift?
    3. for detection of obstacle or person in between the doors of lift, which sensor is being used.
    4. for detection of full doors opened and full closed, you will also required some sensors. you which kind of these are?
    5. It is better if you can send me whole requirments of lift controller and project proposal.
    you can e-mail me on or come for yahoo chat on

  11. alonzo (Lift controller)October 3, 2011 at 7:43 PM

    Hi there,
    I'm an engineering student seeking help on constructing a lift microcontroler for my final year project. i have questions like what are the main things to consider? what is the best microcontroler to use from the 8051 family? why? the programming part whats the best language to use? please contact me letting me know if you can help with this project and what are the prices. kind regards


  12. @ alonzo (Lift controller) :-
    The engineering students should work on project based om microcontroller, it is good to read that you are engineer and you want to develop a lift controller using microcontroller from 8051 family.
    Now answer to your questios are as under:-
    Q1. what are the main things to consider?
    Answer During the developemnt of control for lift or elevvatot, many parameters are required to consider with respect to diffferent aspects, like "selection microcontroller and other components", "interfacing circuit between microcontroller and external devices which depends on sensors and switches", "isolation between inputs, outputs and control circuit, transfer of signals, noise level in the building and surrounding place where the controller will be kept, control citcuit of motors, and algorithm of operation, number of floors etc.
    Q2. what is the best microcontroler to use from the 8051 family?
    Answer Try to search the microcontroller available in local market near you and then make a comarison between their features by studying the datasheets of microcontrollers, then select one which fullfill your requirements.
    Q3. why?
    Answer Because you ahve selected it by doing a healthy comparison of features of different microcontroller, and it is your selection.
    Q4. the programming part whats the best language to use?
    Answer The best language depends upon the microcontroller you selected,your programming skills, compilers, and speed required for different operations.
    Q5. what are the prices.
    Answer How much tea will be sweet? It depends upon the level of suger, more suger in tea, more sweet it is, haaa haaa

    if you still have any questions, then eithor e-mail, or chat, or comments here

  13. Sir, here C program is given for this same project(i.e. 3Storied Lift Controller) I am in the need of Assembly Program which is equivalent to If Available I'll b thankful to you.

  14. Hye Dr.Rana..

    I really attract with this project and I want to make this project for my final project.So,I hope you can give me the list of the components and also the equipments for this project..
    I really appreciate sir...

  15. @ Majid :-
    I donot have assembly languge program OR assembly code for lift or elevator controlller using microcontroller 8051.
    But if you have written the code and it has errors or you are trying to write the assembly language code, and feels difficulty, then you can send me your code, i will check it and try to finish it for you.My e-mail is given on this blog.

  16. @ Adam Is :-
    It is good that you want to make this project as your final year degree project.
    You want the component list and equipement list ok

    This is not a difficult work, open the post and goto the image in which circuit diagram of lift controller is shown, and make your required list by your own, instead of asking me to do the same job for you.

    If you have questions or confusion about the desiging and code writin of the project or if you are not understanding the algorithm of lift controller. Then feel free to ask the question, i will try to help you.

  17. Thank Dr.Rana for the information..
    I do my own first,to see what happen..
    anything problem I will ask you again..
    Ok Dr.Rana..
    Thank you very much..

  18. @ Adam Is :-
    you can discuss the problem related to the microcontroller project.

  19. Hye Dr. Rana..
    This program is in C language..
    I have problem about this C language..
    I not expert with this program language..
    So, did you have program in assembly language because in assembly language I more understand and easy to me to find the errors in my program..
    Thank you..

  20. Yes the lift controller program in this post is written in C-Language.What kind of probelm you have? No problem if you are not expert with this lanuage, mine too not expert, and a few persons in world are expert of C language.I donot have a program in assembly language for lift controller.
    If you feel easy to write your own program and you can remove errors, then do it. very simple

  21. Actually,I not understand program in C language but I need try do first..any problem I ask you again..
    One more thing Dr.Rana, the 7 segments are anode or cathode uses??
    Thank you..

  22. @ ADAM IS :-
    There is no problem , ask as many question as you can.
    The seven segments used in the project of three story lift controller for indication of current floor are of "common Anode " type.

  23. Dr.Rana..
    This circuit is the complete circuit..isn't right??
    There is no additional components to the circuit??

  24. Farah (8051 microcontroller lift controller project)October 16, 2011 at 10:01 PM farah 2nd year engineering student.
    i have to develop a programming using using ic8051.i have elevator project in mind.ive completed my flowchart but i have difficulties with elevator circuit diagram..i hope u can help me with the circuit.
    i m looking forward for your really hope u can help me with this.
    enc :the elevator flowchart system.

    1. Hello i m Final year student and doing Digital lift controller project using 8051 microcontroller
      i need help in circuit diagram as cofused how to do it ?
      plz help .....
      my email is

  25. @ Farah (8051 microcontroller lift controller project):-
    send me the flow chart of your lift controller project.
    tell me is it passenger lift ot cargo lift?
    how many stories or floor are there in the building whose lift controller you want to design.

  26. @ Adam Is :-
    The circuit works fine in proteus and seemed complete, but in real life you will need some componenets related to crystal, and reset circuit, motor interfacing, input interfacing, i assumed the student will do these by their own.

  27. Hi Dr Rana. May i know the terminal of (dg0,dg1,common) from U4,U7,U10 is connecting to which terminal? And the micro controller from pin 21 to 39 is not connecting to anywhere? TQ.

  28. @ kenneth9328 (lift controller connection problem):-
    1. The dg0,dg1,and common are the signals for interfacing the seven segment on each floor, these should be connected to the cicuit shown at the bottom of figure(the display circuit, parallel to each other).
    2.The U7,U4,U10, are the part of seven segment display circuit to be mounted on each floor.
    3.PIn 21 and 39 are left un-connected.

  29. This is not a difficult work, open the post and goto the image in which circuit diagram of lift controller is shown, and make your required list by your own, instead of asking me to do the same job for you.
    Boiler Construction elevator

  30. plz help me wd a prjct : wireless rf anti collision trains wd auto breaking systm.... i need d ckt diag... email :

  31. Sir, I am studying diploma i mechatronics & now I'm in final year. I am going to do elevator control for four stories....
    So, can you help sir????
    I need the whole thing in the way you gave for three stories, but it should be for four stories....:-)
    Thanks in advance...

  32. Sir, I'm final year student studying diploma in mechatronics. I have decided to do 'elevator control for four stories'...
    So, can you please help me for this as I have no idea on how to do this...
    I am looking forward for your reply....
    Thanking you in advance... :-)

  33. How do I write operating module by micro C ???

  34. Hello DR.RANA, i have create the circuit following your circuit diagram. Those 7-segments function correctly, Now the at89c51 seem like cant work at all. i'm program .hex by "kitrus123". can i know the crystal use 12Mhz? It's doesn't work for me, i need ur guidance urgently.... thanks for reply DR.Rana.

  35. sir,i m a third year student working on an elevator system. the above ckt has helped a lot. apart from this my project statement has a clause saying that i hav to incorporate a door open or close buzzer, direction display and load display in the kift. how do u think i should proceed

  36. Hello sir
    i m Final year studend of EE.
    My final project is Digital Lift Controller so i am stuck tht how to start it need some guide lines and if u have some stuff relevant to this plz help me out....
    i need to make Lift controller using 8051 micro controller and stuck tht wht kind of circuit it will be
    looking forward to u

    1. hello i have the same project and also stuck wd some parts so plz help if any1 have relevent stuff or idea

  37. Hi, this blog is really amazing and provide me answers to all my questions. This is really informative and I will for sure refer my friends the same. I got the freebies with the Com Luvs premium and adding this now makes it all even juicier than ever. external lift,

  38. Hello sir,
    I would like to make an CARGO LIFT having four floor including ground floor. Can I use your circuit and what are the changes will have to do in it ? Only simple project I want,doors are not required.

    1. @ VPJUNAIB for Cargo Lift:
      please specify the following things for the project of automatic cargo lift controller:
      1. which microcontroller family or specifically micro-controller you want to use for this project.
      2. is there any hardware specific things or i do have to design all circuit diagrams
      3. any requirements related to compiler or languages of microcontroller programming
      4. what kind of display you want to use on doors and how many indication and buttons you want to use in elevator controller.
      5. are you student or business man???

  39. nkunda evariste for microcontroller based(atmega128) based lift control systemFebruary 15, 2014 at 11:39 PM

    hello friend i need a help to mi final year project\"microcontroller based(atmega128) based lift control system with three floors please help me ho to make program,this is the hardware part:
    -push button to select e desired floor
    -frefrective sensor RPR222 to select lift position
    -atmega128 microcontroller
    -two relay used to control a motor up/down

    1. @ nkunda evariste for microcontroller based(atmega128) based lift control system:
      send me the circuit diagram of the project using microcntroller ATMEGA128. so that i could write code for it.also specify the compiler for programming and which language you want to use for microcontroller program.


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All comments will be highly appriciated.


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(1) Interfacing of DAC0800 with Microcontroller 8051 (1) Interfacing the ADC0804 to the AT89C51 (1) Interfacing with the LM35 (Temperature Sensor) (1) Internal Ram Organization of 8052 Microcontroller (1) Interpreting on Emulator using Pro51 (1) Interrupts (1) Introduction of The Automatic Car Parking using 8051 (1) Introduction of moving message display MMD using 8051 (1) Introduction serial Port RS-232 (1) Introduction to 89C51 Microcontroller (1) Keil C51 program for interface of Graphic LCd with micro-controller (1) Keypad 7-Segment LED interface with Microcontroller 8051 (1) LCD (1) LCD MMD (1) LCD interface to MCU (1) LCD interface with micro-controller 8051 (1) LCD interfacing with Microcontroller 8051 (1) LCD moving message display (1) LED Display driver (1) LED Grow Light Technology is Much Improved (1) LED display (1) LED matrix (1) LM324 (1) LM35 (1) LPT3 (1) LSI displays alphanumeric characters (1) LVDT (1) Lighting Controls (1) Line PrinTer (LPT) devices (1) Liquid Crystal Display LCD Introduction (1) MAX 232 Interfacing with Microcontroller 8052 (1) MAX 232 level converter (1) MAX 232 serial communication (1) MCS-51 family microcontrollers (1) MCU-PC-serial-interface (1) MOVING MESSAGE DISPLAY USING ATMEL 89C51 (1) MSp430 I2c (1) Mechanical methods (1) Memory of 8051 (1) Memory Model (1) Memory Organization (1) Memory mapping (1) Microchip PIC (1) Microcontroller 8051 Projects in c language (1) Microcontroller 8051 and adc (1) Microcontroller 89c52 (1) Microcontroller Applications (1) Microcontroller Circuits (1) Microcontroller Interface with PC parallel port (1) Microcontroller Port2 (1) Microcontroller data logger (1) Microcontroller to LCD (1) Microcontroller51 MCu 8051 LED interface (1) Microprocessor-Compatible (1) MixZing Music Player (1) Mode Selection (1) Modern DAC (1) Moisture Sensors Devices (1) Motor speed control circuits and projects (1) Moving Message Display (1) Multiplex 74ls138 74ls04 8051 16f877 (1) Multiplex LED seven segment diaplay with microcontroller interfacing 74ls138 74ls04 8051 16f877 (1) NAND (1) NOP in 8051 (1) NOR (1) NPN transistor (1) Non-insulated SCR (1) Nyquist A/D converters (1) Nyquist sampling criterion (1) OJ0800 DAC (1) ON-CHIP SERIAL PORT (1) OPAMP LM324 (1) Objective of the project based on microcontroller 8051 (1) On-Chip Clock Generator (1) Open (1) Operational Amplifier (1) Optical Sensor Subroutine (1) Optical sensor (1) Optocoupler and diac MOC3041 (1) PC (1) PC parallel port (1) PC side program for interfacing (1) PCM codec ICs or DSP interface ICs (1) PERIPHERAL INTERFACE PROJECT OF PRESSURE MONITORING (1) PGAs (1) PIC I2C (1) PROGRAM MEMORY (1) PWM with microcontroller 8051 for SCR or triac power control (1) Peripherals Keypad (1) Philips PDS51 development board (1) Pin assignment of liquid crystal display (1) Potentiometric (1) Potentiometric transducer (1) Pressure Sensing System (1) Pressure gauges and switches (1) Pressure monitoring with microcontroller 8051 (1) Pressure sensing and controlling (1) Pressure sensor and transducer (1) Printer Port's addresses in the BIOS Data Area (1) Program counter address (1) Programmable Gain Amplifiers (1) Programming Aspects (1) Programming Aspects of Moving message display project using 8051assembly language program for lcd (1) Project Description (1) Properties of graphite (1) Pseudo-Absolute Encoder (1) RAM of MCU (1) RAM of microcontroller (1) ROM-to-RAM ratio (1) RS-232 Level Converter (1) RS-232 Level Converters (1) RS-232 Standard (1) RS-232 communication (1) RS-232 serial communication (1) RS232 with 8051 (1) RS232 and Microcontroller 80s52 (1) RS232 and microcontroller schematics and C code (1) RS232 communication (1) RS232 serial communication (1) Receive Data (1) Receive Interrupt of 8051 (1) Register Banks of 8052 Microcontroller (1) Relative Humidity Project (1) Reluctive (1) Remote apps for PC and Mac (1) Remotely view (1) Resonant Wire (1) Routine interfacing LCD with 8051 Programmer's Corner. (1) Rs-232 smoke analyzer (1) SAKURA BOARD (1) SBUF and SCON (1) SBUF register (1) SCR control (1) SERIAL PORT REGISTERS (1) SMS Based Controlling Machines Using GSM Mobile and microcontroller 8051 (1) SN7447 (1) SN7447AN decoder (1) SN74LS373 Latch with 3-State Outputs and interface with microcontroller (1) Schematic Circuit Diagram Speedometer Accurate measurement of speed (1) Science/Research (1) Scratchpad Registers (1) Security Camera Systems (1) Selection of Humidity sensor or transducer or transmitter (1) Sensor (1) Sensors (1) Serial Communication (1) Serial Communication RS-232 (1) Serial Communication microcontroller to PC (1) Serial Interfacing of Microcontroller 8051 in Automatic Car Parking Project (1) Serial or Parallel (1) Servo Actuator and DC Motor. (1) Setting the Serial Port Baud Rate (1) Seven (1) Seven Segment Displays of Pressure Monitoring Project (1) Seven Segment Subroutine (1) Signal control on ADC0804 (1) Silicon Serial Number (1) Smartphone (1) Software Download (1) Software Freuency meter and pulse width measurement (1) Software writting procedures serial port communication (1) Solenoid Valve (1) Solenoid Valve Control System Using 8051 Microcontroller (1) Solenoid Valve Controls (1) Solenoid Valve Supplier (1) Start your car remotely (1) Static Power Switches (1) Stepper Motor Control System Interfaced with Personal Computer (1) Stepper Motor Control System Interfaced with Personal Computer serial port baud rate (1) Stepper Motor Subroutine (1) Stepper motor control in assembly lanuage (1) Strain Gage (1) Strobed Input (1) Supply Check Valves (1) Supporting AT commands (1) Synchronous Serial Communication (1) TEMPERATURE CONTROLLER (1) TEXT display (1) TIMER CONTROL (1) TRIAC control circuits (1) TTL (1) TTL CMOS logic level (1) TTL Compatible Inputs and Outputs (1) Temperature Controls (1) Temperature and Humidity Data Logger (1) Temperature sensors (1) Testing Circuit humidity sensing project (1) The Interface of ADC0804 with microcontroller 8051 (1) The MICROCONTROLLERS (1) The interface of DS17885 with at89c51 (1) Timer and counters circuits (1) Timer and counters of 8051 (1) Timer/counters (1) Transducer Types (1) Transmit Data (1) Two types of connectors are used for RS232 communication (1) U shaped tubes (1) UP and Down counter (1) USB programmer of microcontroller (1) Ultimate PC Remote Control (1) UltralISO (1) Understanding 8051 (1) Universal Blue Tooth controller software (1) Universal PC remote control from your phone or tabletRemotely browse your (1) Use of MICROCONTROLLER in Pressure Monitoring Project (1) VB6 RS-232 serial communication example program with microcontroller 8051 or PIC or AVR (1) VB6 serial interface (1) VLC (1) Von Neuman architecture (1) WDTV Media Players Remote app (1) WIN-Remote (1) Waveform Digitizer Capturing (1) Weather AnemometerRoom HumidityHome HumidityHumidity Cabinet (1) What are the time trigger applications (1) What is null modem cable (1) Wi-Fi Based Home Automation System (1) Wifi (1) Windows Media Player (1) Windows PC over Wi-Fi or Bluetooth (1) Windows Phone 8 and BlackBerry (1) Wireless Humidity Sensor (1) Wireless sensor based Vehicle central Lock Control System using Microcontroller (1) XBMC (1) XOR (1) ZERO-CROSS OPTOISOLATER TRIAC DRIVER OUTPUT MOC3041 (1) Zero crossing Optocoupler MOC3041 (1) access control car (1) accuracy of adc (1) addresses in hexadecimal are 378h (1) algorithm for pulse width measurements (1) alphanumaric LCD (1) analog input voltage to the ADC (1) analog temperature sensor (1) analog to digital conversion (1) analog voltage signal generation of 0 to 10V (1) analog-to-digital converter (ADC) (1) and 37Ah (1) and DS1685 PC real-time clocks (1) and Storing (1) android gmote server linux (1) android market (1) android remote (1) anode (1) apps for special education (1) assembly code circuits (1) assembly code projects (1) assigned devices LPT1 (1) aston martin (1) at89c51 as counter (1) atmel 2051 (1) atmel humidity Assembly Language code (1) atmel serial eeprom (1) autocop car security system (1) automatic car parking system using microcontroller (1) automatic car parking system with microcontroller (1) automatic control systems (1) avr i2c (1) best wireless camera security system (1) better resolution (1) bigger LCD (1) biomedical instrumentation (1) blocked motor start rotating (1) blue control modern (1) board development and fabrication (1) brown out detector (1) build simple calculator using keypad (1) buzzer siron (1) byte read (1) c language code (1) c language program (1) c++ code (1) calibration of ADC and DACs (1) capacitive (1) car parking and microcontroller (1) carbon dioxide (1) carbon monoxide (1) characteristics of analog sensor (1) charging the battery (1) circuit design for a elevator (1) circuit diagram (1) circuit diagram for intestinal sound detector (1) circuit diagram multiplex led (1) circuit diagram of moving message display (1) circuit diagram of serial communication via rs232 (1) circuit diagram of the microcontroller project for humidity and clocking (1) circuit diagram to interface LCD with Microcontroller 8051 (1) circuit disgram of stepper motor (1) circuit prototyping (1) clock vis (1) clocked out (1) code (1) code for gsm modem interfacing with p89v51rd2 microcontroller (1) code for microcontroller (1) commands of lcs (1) comminication (1) common (1) common 8N1 format (1) communicating direct with the aircraft computer (1) communication of the data between PC and RAM. 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What are HEX files? 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