GSM based Anti Theft security locker system

Generally in our homes and banks we will put our money ,Gold and other expensive items in the lockers. In case if there is no person in the home/bank, there is a chance that an unauthorized person (stealer) may broke the locker and steal your property. There is no guarantee that you will get back your property. Keeping this point in mind i designed a security system which will alert the owner and Cops when unauthorized person opens your locker. 

Block diagram:                                                                                                

                              

 













Working:
When the locker is closed the controller will not send any message to the owner. When unauthorized person opens the door the controller will send a message "Warning: Unauthorized person opened the lock" to the owner ( and also to the police controller room with address if required).

Schematic Diagram:

unauthorized person opened the lock

to download C-code

 Flow Chart:
                                         

                                             

Pulse Rate monitoring in PC (wireless)

This circuit is used to display the number of pulses occurred per minute on the PC desktop.we can use this to calculate frequency of the signal. 

Working: i will calculate the signal peaks every minute and i will send that information using wireless protocol(Gigbee/GSM). on the other end i will receive by the same wireless device and i will send the same data to RS232 port of a PC. You can monitor the data on Hyper-terminal.

     

                                                                                                             

You have to connect wireless device GSM/Gigbee on both sides. depending the device connected you have modify your code.                                                             

NOTE: i haven't indicated any wireless device. that will be connected to DB9 port.

More information is prohibited here on this topic.

Automatic car parking indicator using 8051

This system will indicate empty and filled car parking slots at the entry. Now a days Car parking at shopping malls and markets is becoming a big issue and is causing to traffic jam. To avoid this  problem we are designing this system to indicate empty slots and filled slots, so that a car driving person can directly take his car to that particular empty slot. we will indicate the slot state by LEDs and also in LCD screen. we will use IR sensors to sense the presence of car in the slot.

Working: when a car enter into a empty slot the photo detector output will become '1', this will change the state of the slot to filled, otherwise it is remained in empty state only. like wise all the slots are detected by IR sensors.

Here is the functional flow chart

  to download C-code
  to see output video 
  to see working video -1

Schematic Diagram:

case'1': when all the slots are empty

all the LEDs are glowing and slot states are displayed in LCD  

here LED ON means slot empty; and LED OFF means slot filled 

case'2': when 1st and 2nd slots are filled

1st and 2nd LEDs are glowing and the same thing is displayed in LCD

NOTE:

pushbuttons are to be replaced by IR sensors and comparators

Coal mine detection robot

It is mandatory to check the coal mine weather conditions prior to workers entry. If the weather conditions are normal then workers can enter , otherwise they will not go inside the mine. To check the weather conditions all over the mine we will send one robot which will monitor CO (carbon monoxide) in the mine, temperature and light intensity in the mine. After reading each parameter it will compare with threshold readings and produces output depending the readings taken. This robot is also an obstacle avoidance robot, it uses IR sensors to control its movement in the mine.

here is the flow chart

to download C-code
  to see video output

Schematic Diagram:
case'1':  when the light intensity is less in the mine
pulse width to the light is 0.1sec. and obstacle detected on left side. robot moving to right side 
                          A Reference book to learn about robots in hazardous environments here

case'2': when light intensity is less, high temperature and CO gas exceeded in the mine
 pulse width to the light is varying 0.1s, 0.25s and 0.5 sec to indicate 3 parameters are not in normal condition. and no obstacle detected

NOTE: 
push button at P1.3 has to be replaced by CO Gas sensor,
push buttons at P1.4 and P1.4 are to be replaced by IR sensors.  
Green LED will be replaced by Buzzer.
Threshold values may vary in practical