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High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

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Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of
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GSM based Anti Theft security locker system

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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:
                                         
                                             

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