A METHOD TO IMPROVE SENSOR ACCURACY USING MULTIPLE SHIFT RESISTORS AND A SYSTEM THEREOF

摘要

The invention discloses a method to improve sensor accuracy by using multiple pull-up/pull-down resistors as shift resistors. Generally, it is easy to choose a single value for pull up resistor to achieve sensor accuracy for using one resistor at one input port of microcontroller. This method is used where a single input port of microcontroller has to support measurement of physical variables of many sensors. The method uses multiple resistors to improve the sensor accuracy. Different shift resistance combinations used in the method give different voltage effects to same input voltage under same detection point of physical variable which pulls up or pulls down the input voltage at ADC pin. The method reduces hardware complexity, increases reliability, simple in operation and high in sensor accuracy. Further, the present invention also relates to a system for improving sensor accuracy to measure temperature, pressure and other physical variables by using multiple shift resistors.