Low-cost teslameter based on hall effect sensor MLX90242

Abstract

A low-cost teslameter based on a Hall effect sensor MLX90242 is proposed in this paper. The proposed teslameter is built around a PIC18F4550 microcontroller and it can measure magnetic flux density in the range between -55 mT and 55 mT. Temperature stability of measurements originates from the MLX90242 sensor itself. In order for the proposed transducer to be accurate, it has undergone a calibration procedure using a highly accurate teslameter employed as reference instruments and high-quality variable-field electromagnet. The proposed teslameter can store measurements on a PC via built-in USB communication. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III43014]

Keywords

• calibration
• hall effect sensor
• microcontroller
• teslameter
• variable field electromagnet