jbiams77 / biot_savart Goto Github PK
View Code? Open in Web Editor NEWThis project was to explore Biot Savart's law that relates the magnetic field along an axis through a solenoid. I built a test probe using a hall effect sensor that moves along the axis with exact precision using a stepper motor. The stepper motor is controlled by a circuit I built on a custom PCB. I chemically etched the PCB using negative photoresist, developer, and chemical etchant. The Hall effect sensor is amplified with an opamp and connect to an analog to digital converter(ADC). The ADC sends magnetic field strengh data to a raspberry pi. The sensor is driven along the axis and samples measurements at timed interval. The variable in the system is a change in current applied to the coil. It is observed that the magnetic field is non-linear at a certain point due to the inheritant resistance of the copper wire and the max. densitity of magnetic lines of flux in an air core.