week11 chanegs added

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<img src="images/week11/c4.jpg" style="width:35%" />
<center><figcaption>Fig. working of the light sensor</figcaption></center>
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<center><video width="400" controls>
<source src="images/week11/1.mp4" type="video/mp4"> </video></center>
<center><figcaption>Fig. working of the light sensor</figcaption></center>
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<h3>Group work:</h3>
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<p>For the group assignment, I worked with <a href="http://fabacademy.org/2019/labs/oulu/students/alok-sethi/assignments/week11/">Alok</a>, <a href="http://fabacademy.org/2019/labs/oulu/students/jobin-varghese/assignments/week11/">Jobin</a>, <a href="http://fabacademy.org/2019/labs/oulu/students/michael-oduor/assignments/week11/">Micheal</a>, and <a href="http://fabacademy.org/2019/labs/oulu/students/yasir-shafiullah/week%2011.html">Yasir</a> to probe a hall sensor&rsquo;s analog and digital signals. </p>
<p> A Hall effect sensor is a device that is used to measure the magnitude of a magnetic field. Its output voltage is directly proportional to the magnetic field strength through it. Hall Effect sensors are used for proximity sensing, positioning, speed detection, and current sensing applications. The Hall Effect sensor that we used was A3245: Chopper-Stabilized Omnipolar Hall-Effect Switch. The A3245 integrated circuit is an omnipolar, ultrasensitive Hall-effect switch with a digital output. This device has an integrated regulator permitting operation to 24 V, making it the first omnipolar switch available for operation to 24 V. This device is especially suited for operation over extended temperature ranges, up to +150°C.</p>
<img src="images/week11/group/pic1.jpg" style="width:35%" />
<center><figcaption>Fig. A3245: Chopper-Stabilized Omnipolar Hall-Effect</figcaption></center>
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<img src="images/week11/group/pic2.jpg" style="width:35%" />
<center><figcaption>Fig. Sensor on PCB Board</figcaption></center>
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<img src="images/week11/group/pic3.jpg" style="width:35%" />
<center><figcaption>Fig. Providing voltage to the sensor</figcaption></center>
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<p>The sensor board was tested by applying 5V power supply across it and measured the resulting voltage at the output of the sensor. The output voltage with no magnetic field nearby was 2.5V. When the north pole of the Magnet was brought close to the sensor, it gave an output voltage of 5V and when the south pole of the magnet was brought close to the sensor, it gave an output voltage of 0V, This clearly Indicated that the sensoe was working perfectly.</p>
<img src="images/week11/group/pic5.jpg" style="width:35%" />
<center><figcaption>Fig. 5V Supply at the input of the sensor</figcaption></center>
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<img src="images/week11/group/pic6.jpg" style="width:35%" />
<center><figcaption>Fig. Output voltage with no magnetic field around</figcaption></center>
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<img src="images/week11/group/pic7.jpg" style="width:35%" />
<center><figcaption>Fig. Output voltage with the North Pole close by</figcaption></center>
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<img src="images/week11/group/pic8.jpg" style="width:35%" />
<center><figcaption>Fig. Output voltage with the South Pole colse by</figcaption></center>
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<h3>Models files</h3>
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<a href="images/week11/week11.brd" download>Eagle layout file</a><br>
<a href="images/week11/week11.sch" download>Eagle schematic design file</a><br>
<a href="images/week11/atmel" download>atmel studio file</a><br>
<a href="images/week11/hello.light.45.py" download>python code to display the light sensor data</a><br>
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