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8051 Microcontroller Overview


The 8051 microcontroller, developed by Intel in 1981, is an 8-bit microcontroller renowned for its versatility. Often referred to as a “system on a chip,” it incorporates 40 DIP (Dual Inline Package) pins, 128 bytes of RAM, 4K bytes of on-chip ROM, two timers, one serial port, and 4 ports (8-bit wide), all integrated onto a single chip.

Key Features


– 8-bit architecture
– 40 DIP pins
– 128 bytes of RAM
– 4K bytes of on-chip ROM
– Two timers
– One serial port
– Four parallel 8-bit ports
– Onboard 12 MHz crystal oscillator

 8051 Pin Diagram

Pin Configuration
The 8051 microcontroller utilizes a 40-pin PDIP (Plastic Dual Inline Package) configuration to facilitate various I/O operations. Among these pins, 32 are dedicated to I/O operations, while the remaining 8 serve specific functions.

Pin Functions
1. **Vcc:** Power supply voltage pin
2. **GND:** Ground pin
3. **XTAL1:** Crystal oscillator input
4. **XTAL2:** Crystal oscillator output
5. **RST:** Reset pin
6. **EA:** External Access pin
7. **ALE/PROG:** Address Latch Enable/Program pin
8. **PSEN:** Program Store Enable pin

All 8051 Projects List

  • Motion Controlled Pick & Place Obstacle Avoider Robotic Vehicle
  • Remote Control Plant Watering System Using 8051
  • Auto Billing Mall Shopping Cart 8051
  • Plant Soil Moisture & Ph Sensing Alarm Using 8051
  • DTMF & RF Dual Controller Based Robot
  • Automatic Whiteboard Eraser Robot
  • RFID Attendance System With SMS Notification
  • Motion Based Door Opener With Metal Detector
  • Automatic BMI Calculator Using Load Cell & Height Sensing
  • Human Speed Detection Project
  • Accurate Room Temperature Controller Project
  • Automated Elevator With Overload Alert
  • Machine Overheat Detection With Alert
  • Home Automation Using Android
  • PC Based Home Automation
  • BLDC Motor Speed Control Using Fuzzy Logic
  • Voice Controlled Robotic Vehicle
  • Automatic Light Intensity Controller By External Light Sensing
  • Rf Controlled Spy Robot With Night Vision Camera
  • Hand Motion Controlled Robotic Arm
  • Hand Motion Controlled Robotic Vehicle
  • Industry Power Consumption Penalty Minimization Using AFPC Unit Project
  • Advanced Military Spying & Bomb Disposal Robot
  • Circuit Breaker Based On Password
  • Multi Microcontroller Networking System
  • Device Load Monitor With Programmable Meter For Energy Audit
  • Ultrasonic Radar Project
  • Power Grid Failure Detection Based on Voltage and Frequency Variance Detection
  • Thyristors Based Dual Converters
  • Voice Based Notice Board Using Android
  • Flexible Ac Transmitter System Using TSR
  • SVC Based Flexible AC Transmission System(FACTS)
  • Microcontroller based 4 Quadrant speed control system
  • Controlling Pc By TV Remote as Mouse
  • Lamp Illumination Control With Precision
  • Remote Controlled Pick & Place Robotic Vehicle
  • Load Shedding Time Management With Programmable Interface
  • Ultrasonic Object Detection Project
  • Solar Street Lights With Auto Intensity Controller
  • Industry Automation Using Programmable Switching in Repetitive Nature Of Work
  • AC Power Controller With Programmable Interface
  • Postage Stamp Value Calculator
  • Android Controlled Wildlife Observation Robot
  • Vehicle Movement Based Street Lights With External Light Sensing
  • Controlling Pc By TV Remote as Mouse
  • Electrical Load Controlled By PC
  • Displaying Moving Message On Notice Board Using PC
  • Precise Digital Temperature Controller
  • Motion Based Automatic Door Opener
  • Wildlife Observation Robot Using Rf
  • Industry Temperature Control System
  • TV Remote Controlled Home Appliances Project
  • Vehicle Sensing Street Lights Project
  • Efficient Power Manager Project
  • IR Based Obstacle Detection For Load Switching Project
  • IR Based Traffic Density Detection And Signal Adjustment
  • Ultrasonic Distance Measurement Project
  • IR Based Dish Position Controller
  • Dynamic Signal Light Timings On Traffic Density
  • Liquid Level Controller System Without Contact
  • Closed Loop DC Motor Control To Run It At Exact Speed
  • RPM Display For BLDC Motor With Speed Controller
  • Visitor Sensor Light With Seven Segment Display
  • Display Object Counter On 7 Segment Display
  • Home Automation Using Touch Screen
  • Android Controlled Pick And Place Robotic Arm Vehicle Project
  • SMS Controlled Railway Level Gate Control With Programmable Numbers
  • Vehicle Theft Detection/Notification With Remote Engine Locking
  • Patient Health Check Using Wireless Health Monitor
  • Car Overspeeding Detection Project
  • MC Based Line Follower Robot
  • Robotic Vehicle With Metal Detection Project
  • Smart Floor Cleaner Robot Using Android
  • Automatic Vacuum Cleaner Robot Project
  • IR Wireless Underwater Communication System
  • Long Range Spy Robot With Night Vision
  • Long Range Spy Robot With Obstacle Detection
  • Long Range Spy Robot With Metal Detection
  • Fire Fighter Robot With Night Vision Camera
  • AC Power Strength Controller System
  • Android Antenna Positioning System
  • Traffic Signals With Synchronization System
  • Multi Motors With Synchronized Speed
  • Single Phase Induction Motor With Smooth Start
  • Configurable Password Security System
  • Displaying message Using Led Propeller
  • Thyristor Based Cyclo Converter
  • Remote Controlled Induction Motor Controller
  • Induction Motor Timer Using Auto Delta Star Starter
  • Multi-Power Supply Using 4 Different Sources
  • IR Remote Thyristor Power Controller
  • Controlling Induction Motor Power Through Thyristor
  • ZVS Based 3 Stage Solid State Relay
  • DC Motor Speed Controller
  • Cycle Switching Without Harmonics For Industrial Power Control
  • Thyristor Firing Angle Control For Battery Charging
  • Street light automatic intensity controller
  • Security Access Control Using RFID Project
  • Attendance System Based On RFID Project
  • RFID Based Passport Project
  • Android Military Spying & Bomb Disposal Robot
  • Automating Homes Using RF
  • RF Based Secure Door Opener System
  • RF Secure Coded Communication System
  • Load Control System Using DTMF
  • Voice Controlled Home Automation
  • DTMF Cell Phone Based Door Opener
  • Remote Vehicle Control Through Cell Phone
  • Dialled Telephone Number Display On 7 Segment
  • Digitally Controlled Home Automation Project
  • Android Controlled Induction Motor with 7 segment display
  • Android Controlled Notice Board Project
  • Density based traffic controller with android overriding ability
  • Hovercraft Controlled By Android
  • Android Controlled Automobile
  • Remote Controlled Robotic Arm Using Rf
  • Android Controlled Robotic Arm
  • Programmable Sequential Load Operation Controlled By Android Application Project
  • Android Password Based Remote Door Opener System Project
  • Android Controlled Remote Password Security
  • Android Controlled Railway Level Gate Control
  • Android Controlled Remote AC Power Control
  • Robot Controlled By Android Application
  • Home Appliance Control Using Android Application Project
  • Android Controlled Fire Fighter Robot
  • Android Controlled Based Spy Robot With Night Vision Camera
  • Android Controlled Pick And Place Robotic Arm Vehicle Project
  • Wireless Surveillance Robot Controlled by PC
  • Shuttling Metro Train Between Stations Project
  • Solar Panel With Sun Position Tracking
  • Android Circuit Breaker
  • System To Measure Solar Power
  • Controlling Solar Energy Charge
  • Obstacle Avoider Robotic Vehicle
  • Robotic Arm Vehicle Controlled By Touch Screen Display
  • TV Remote Controlled Robotic Vehicle Project
  • Robot Controlled By Android Application
  • Android Controlled Fire Fighter Robot
  • Android Controlled Based Spy Robot With Night Vision Camera

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