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PIC Microcontrollers
The document presents an overview of microcontrollers, specifically focusing on PIC microcontrollers, and highlights their differences from microprocessors. It covers the history, applications, limitations, and components required for various projects using PIC microcontrollers, including home security systems and digital persistence of vision displays. The presentation also discusses development tools and includes schematic diagrams for the designed circuits.
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PIC Microcontrollers
- 2. Abstract of thePresentation What is a Microcontroller Difference b/w µprocessor & µcontroller Introduction to PIC Microcontrollers What makes them useful? Limitations of PIC Microcontrollers Past Scenario of PIC Microcontrollers Present and Future Scenario of PIC µC (Apps)
- 3. What is aMicrocontroller? A microcontroller (sometimes abbreviated µC, µC or MCU) is a small computer on a single integrated circuit containing a processor core, memory, and programmable input/output peripherals. Program memory in the form of NOR flash or OTP ROM is also often included on chip, as well as a typically small amount of RAM. Microcontrollers are designed for embedded applications, in contrast to the microprocessors used in personal computers or other general purpose applications.
- 5. The die froman Intel 8742, an 8-bit microcontroller that includes a CPU running at 12 MHz, 128 bytes of RAM, 2048 bytes of EPROM, and I/O in the same chip. A PIC 18F8720 microcontroller in an 80-pin TQFP package.
- 6. Difference b/w µProcessor& µController- Microprocessor Microcontroller Microprocessor is a multipurpose, programmable, register based electronic device which read binary instructions from memory, processes the input data as per instructions and provides output Microcontroller is a device that includes microprocessor, memory and input/output devices on a single chip It does not has inbuilt RAM or ROM and timer It has inbuilt RAM or ROM and timer Boolean operations are not directly possible Boolean operations are directly possible Program and data are stored in same memory Separate memory to store program and data
- 7. • PIC isa family of microcontrollers made by Microchip Technology. • The original PIC1650 was developed by General Instruments. • PIC stands for “Programmable Intelligent Computer” although it is now associated with “Programmable Interface Controller.” • PICs use an instruction set that varies in length from about 35 instructions for the low-end PICs to more than 70 for the high-end devices. Introduction to PIC µC-
- 8. What makes aMicrocontroller Useful? Small Instruction Set to learn Inexpensive RISC architecture Built in oscillator with selectable speeds Programmable Comparators Easy in-circuit programming
- 9. Limitations- One accumulator Operations andregisters are not orthogonal Register-bank switching is required to access the entire RAM of many devices
- 10. PIC µC Baseline PICfamily Mid-range PIC family High performance PIC family
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- 14. Keypad Calculator LED desk lamp POVdisplay Binary Clock Home Appliances Frequency Counter Temperature Sensor Ultrasonic Range Finder Parallel Port Interface Servo Motor Driver Light Sensor Applications
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- 18. Home Security- • Securityis a prime concern in our day-today life. Everyone wants to be as much secure as possible. • An access control for doors forms a vital link in a security chain. • The Microcontroller based Home Security System can be adopted at Home it has various type of Sensors. • For making an easy and effective home security system we can use magnetic sensors, Wire Loop sensors, Fire sensors. • The system is fully controlled by the PIC µ 8951.
- 19. Components Required- ICs • PIC8951 IC • NE 555 (Timer IC) Sensors • LDR • Read Switch • Wire Loops Transistor • BC 547 Resistors • 1- 2.2 KΩ • 3- 10 KΩ • 1- 56 KΩ • 1- 330 Ω Capacitors • 1- 1 F • 2- 33 pF
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- 21. Fire Sensors Read Switches WireLoops LEDs Block Diagram- Buzzer
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- 24. Flowchart- Start All LEDs off Buzzeroff If Door 1 opens LED 1 ON If Door 2 opens LED 2 ON If Wire loop 1 breaks If Wire loop 2 breaks LED 3 ON LED 4 ON If Wire loop 2 breaks If Wire loop 2 breaks LED 6 ON LED 5 ON A A BUZZER ONStop
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- 26. Working- Using Magnetic Switches Whenboth the doors are closed When Door 1 Opens LED 1 glows Buzzer
- 27. When Door 2Opens Buzzer Connection terminated LED 2 glows
- 28. Using Wire Loops Buzzer Whenboth wire loop 1 is closed When loop 1 opens (Short) LED 3 glows
- 29. Using LDR Absence offire Presence of fire LED 5 glows Buzzer
- 30. Persistence Of Vision- Persistenceof vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina.
- 31. This animated cartoonof a galloping horse is displayed at 12 drawings per second, and the fast motion is on the edge of being objectionably jerky.
- 32. Digital POV Display- •The Digital POV Spinning device can write text, draw small icons, and display patterns as you spin it around. • It works by encoding your visual data onto a series of 8 LEDs that are spun on a cord like a fire spinning poi. • In one rotation there are roughly 600 virtual pixel positions. With 8 pixels on the Y axis, and 600 on the X (rotation) axis, there are 4,800 effective pixels in the display. • The Digital Spinning Poi acts like an air display hovering in front of you due to the effect of persistence of vision.
- 33. Components Required- IC • PIC18F2685 IC • 7805 IC Resistors • 8- 75Ω Capacitors • 1- 330 nF • 1- 100 nF LEDs (8) ICSP connector DC power connector
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- 38. Home Appliances- The HomeAppliance application of PIC microcontroller lets you operate your home appliances like lights and water pump from your office or any other remote place. So if you forgot to switch off the lights or other appliances while going out, it helps you to turn off the appliance with your cell phone. Your cell phone works as the remote control for your home appliances. You can control the desired appliance by pressing the corresponding key. The system also gives you voice acknowledgement of the appliance status.
- 39. PIC 8951 µC VoiceRecording & Playback device IC Component Details-Relay Driver DTMF Receiver
- 40. Component layout ofthe PCB-
- 41. Development Tools- MPLAB MIKROC PROTEUSPIC Kit 2 DIPTRACE ARES
- 42. References- >>www.embeddedsystemne ws.com>> www.wikipidea.com >> www.google.com >>www.cnn.com >>www.engineeersgarage.com>> www.infobarrel.com >> www.fadooengineers.com
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