Magnet Sensor
This project has been developed in association with Lancaster University, England.
The objectives of this project are as follows:
- Detection The magnet sensors are used to detect whether a magnet is present or not. This can be achieved by letting a led light or even a small mono sound when the magnetic presence is detected.
- Left/Right Movement The magnet sensors should be used to detect whether a magnet was moved from left to right or vise versa. A phone application can then be used to show an arrow to represent this movement.
- Compass An improved motion detection based on objective 2.
To this, sensors of type Hall Effect Sensors are used. There are 9 of these sensors on the Magnet Sensor board, which are aligned on a 3x3 grid numbering from 1 to 9.
The output from the magnet sensors are directed to the Opensensor Board via a connector cable, so sensor 1 (s1) is connected to RB0 (pin on the sensor board) and s2 to RB1 and so on.
The application on the Opensensor Board samples those 9 input pin every 200ms each and outputs the following values:
output | interpretation |
000 | East (right) movement |
045 | North east movement |
090 | North movement |
135 | North west movement |
180 | West (left) movement |
225 | South west movement |
270 | South movement |
315 | South east movement |
Each output value is terminated with newline “\n”. The two interfaces of the Opensensor board, Bluetooth and the RS232, can be used to view the output.
Materials