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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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Temperature Monitoring using Arduino Uno

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In this project we are going to monitor room Temperature with Arduino Uno board. Connect the temperature sensor LM35 as shown in the figure. Output of the LM35 is connected to the Analog port A0, itreads the temperature variation and it displays the digital data on to the LCD screen. Run the code given below.

#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("Temp monitoring");
}

void loop() {
  float temp;
  temp=analogRead(0);
  lcd.setCursor(0, 1);
  lcd.print("Temperature=");
  lcd.print(temp);
  delay(100);
}

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