ATMEL 89 Series Flash Microcontroller

 

Microcontroller Based Event Counter

The project presented here is based on world’s most powerful micro-controller based on intel’s mcs-51 family , generally known as intel-8051. We have used its derivative atmel-89c2051.

Event Counter Block Diagram Operation: Any type os active or passive switch can be connected to the con1 connected
When ever that switch closes event will be counted inside the microcontroller and would be displayed on the 2×16 lcd. Switch could be capacitive,inductive or any other type which suits to your construction.
Ic3 an optocoupler will receive incoming count pulse at pin3 and output from pin 5 is connected to p3.4 pinof the ic2 microcontroller,
Two line by 16 character on each line (2×16) is used in nibble mode and maximun count can reach upto 65536 there after it will reset to 00000.
SW1 is manual reset switch to make the counter to reset to zero.
Circuit is driven by 9v 1 ampere transformer connected to PCON1
Diode D1-D4 forms bridge circuit C1,c2 and c3 are filter capacitors and are part of power supply section..
Ic1 7805 is 5v regulator ic to give stablised supply to microcontroller. Ld1 is a power indication led. R1 controls the current flowing thrugh led LD1 Crystal X1 along with C5 and C6 gives the necessary clock to microcontroller.
Capacitor C4 and R2 gives the required reset pulse to microcontroller.

8051 Based code Lock With dial up

8051 Based code Lock More and more devices are coming every day to protect your house and property from thiefs .Present project is also one of them. The project presented here is based on world’s most powerful intel’s mcs-51 family of microcontroller atmel at89c51.
8051 Based code Lock With dial up Block Diagram When ever somebody tries to open your latch by entering wrong numbers.
After three wrong retries. The project takes the following action
1) Sounds an siron to attract your or public attention .
2) It will call a telephone number you wanted the device should call you in such case.
3) I will make 5 attempts to call you at the interval of one second and deliver the emergency message stored in speech ic.
4) During this operation the key board will get lock and will not except any key press.
5) Key lock will be indicated by an led LD4 connected on top of kaypad, will glow permanently till the time keypad is lock.
6) Key pad will get unlock only after 5 retries of the phone.
The project comprises of the following blocks:
• Microcontroller
• Password store key
• Telephone store key
• Indication leds
• 4×3 matrix key pad
• serial eprom to store the password and telephone number.
• Speech circuit
• Amplifier circuit
• Off-hook circuit
• Dialer circuit
• Latch relay
• Power supply

8051 Based Electronic Eye

This project is based on high sensitive IR Transmitter & Receiver having range of more than 15 feet. When you are away for your house any if anyone tries to enter the house by any means the device shouts CHOR-CHOR-CHOR-PAKDO-PAKDO-PAKDO Continuously more than 40 seconds, that is enough to chase the thief, he will run away so your house is protected. The device not only shouts but also dials out previously stored telephone number ( which you have stored) and gives you the message CHOR- CHOR- CHOR. So that you understand that something is wrong at your house, you can immediately call up your neighbor to look after your house. 8051 Based Electronic Eye Block Diagram Working Description of Electronic Eye with Dial-Up
1. Keep the transmitter & receiver aligned in a straight position facing each other about a distance more than 2 meter but not less than that.
2. Connect the two 1.5v cells inside the bobbin of transmitter module properly.
3. Connect the telephone line to telephone line input of the circuit.
4. Connect the mains cord to 230v AC of your supply & switch on the supply.
5. When you switch on the supply if the circuit initially plays any alarming message only press the reset switch to make the message off.
6. The message will reset only after completing the total message when you have pressed the reset switch SW1.
7. If the message is continuously playing after the reset switch has been pressed means that the transmitter (TX) & receiver (RX) is not properly aligned or it is being obstructed.
8. Switch on the power supply if no message is played first step is to store the telephone number of the concerned person.
9. To store the telephone number press the off hook switch SW2. Dial the telephone number by the keypad.
10. By doing that the green LED on the PCB will be glowing showing that the telephone number has been dialed.
11. Wait for 5 to 6 seconds after dialing out the telephone number then take off the hand from the off hook switch means that your number has been stored.
12. After that obstruct the beam created between infrared receiver (RX) & transmitter (TX) immediately after that you hear the alarming message (chor chor ….) through the speaker.
13. At the same time it will dial out the telephone number which has been stored.
14. You can hear the same alarming message through telephone line for 30 seconds.
15. The message will be stopped for 30 seconds & again after 30 seconds you can hear the same message through telephone line till no one is resetting the circuit.