Application of Hall Effect sensor: A study on the influences of sensor placement

In this study, the influences of the position and direction of Hall Effect sensor and permanent magnet were assessed to evaluate the appropriate placement of the sensor module under the same conditions. The experiment was divided into 4 cases: Single Hall Effect sensor, 5-Array Hall Effect sensors, 4-Array Hall Effect sensors, and 4-Crossing Hall Effect sensors. Moreover, the density of magnetic field from permanent magnet was varied by 135 mT, 292 mT, and 281 mT and magnetic poles were alternated in each experimental case. In case of the sensor module with 4 Hall Effect sensors, the number of magnetic poles was equal to the number of sensors. Output signal from experiment was in electrical analog form and then transmitted to a computer for collecting in the database and analyzing the accuracy of the sensor module via 12-bit and real time ADC processed by ARM7 Microcontroller.