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

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

GSM Interfacing with Arduino Uno board/ Temperature monitoring using LM35

Abstract: In this project we are going to develop a system, which will monitor temperature in the surroundings and sends a message to the corresponding person. We used GSM SIM300 Modem, Arduino Uno board and LM35 sensor. This system can be installed in Forests, Industries and even in homes to monitor the fire accidents and intimates the person to take immediate action.

Figure below shows the circuit connections.

LM35 is a temperature sensor,who's output varies according to the temperature variations. Every 1 degree C temperature variation changes its output voltage by 10mv. If the current room temperature is 25 degree C then the output voltage will be 0.30 volts. Vcc of LM35 is connected to 5v supply of Arduino Uno , Analog output and GND pin to A0 pin ,GND of Arduino pin respectively.

GSM interfacing to Arduino Uno board:

Connect Receiver pin of GSM modem to the Transmitter pin of Arduino Uno, Transmitter pin of GSM modem to Receiver pin of Arduino Uno and connect both the grounds. Insert SIM and plug the modem. Wait for the GSM modem to get network, indicated by LED blinking. 

Flow chart: 



Resources:

1.  to download the Arduino Uno Code
2.  to see LM35 datasheet

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