vài thông tin để tính toán cho hall sensor
http://www.allegromicro.com/en/Desig...ectronics.aspx
http://www.allegromicro.com/en/Desig...ion-Guide.aspx

http://www.akm.com/akm/en/product/detail/0004/
http://www.ti.com/lit/an/sboa136/sboa136.pdf
http://www.gmw.com/magnetic_sensors/...FINAL.2011.pdf
http://www.gmw.com/magnetic_sensors/...FINAL.2011.pdf