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Build a device that will check whether your door is locked, using a Raspberry PI, a hall effect sensor and a small but strong (preferably neodymium) magnet. It will store the results in a cloud database of your choice (this specific one uses AWS DynamoDB ). The results can be displayed by a separate web application using the same database.
The module contains the AS5048B integrated circuit, which allows the measurement of the magnetic field perpendicular to the surface of the integrated circuit. The module is suitable for measuring the angular position of a magnet and constructing tachometers. The communication interface is I2C.
An Arduino sketch to calculate distance traveled by a wheelchair, and angle turned (if any) using Hall effect sensors and magnets mounted on the wheelchair.
This code example demonstrates how to interface a bipolar hall sensor to PIC microcontroller through built-in CCP peripheral. Compatible PIC16F152xx family of MCUs are PIC16F15214,PIC16F15223,PIC16F15254,PIC16F15276.
Example for a BLDC Motor Control application, using the new AVR-EB family of devices. Trapezoidal drive-motor synchronisation with sensored or sensorless feedback, start ramp and multiple fault sources.