Implementation of an AMR magnetic sensor by means of a microcontroller to achieve more accurate response

Small magnetic sensors are widely used integrated in vehicles, mobile phones, medical devices, etc for navigation, speed, position and angular sensing. Despite the practical advantages that anisotropic magneto resistive (AMR) sensors provide, they are highly temperature dependent. Another factor which extremely affects the measured magnetic field, is the inherent resistive structure of the family. In this work a low-cost, effective micro controller digital solution is proposed to refine the accuracy and reliability of the (AMR) sensor. This approach will not only remove the dissimilarity of the Wheatstone bridge thin-film stripes and temperature drifts, but also corrects inaccuracies caused by the effect of nonlinearity and hysteresis.