Commit 29598ce5 authored by Arash Sattari's avatar Arash Sattari

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<li class="nav-item dropdown">
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<a href="week1.html">W1: Project Management</a>
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<a href="week9.html">W9: Molding and Casting</a>
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<h3 class="mt-4">PCB Design</h3>
<p>
When designing the PCB for the schematics of Fig. 1, I decided to experiment a new feature,
adding a logo to the PCB. I did a bit of research and found this useful video.
adding a logo to the PCB. I did a bit of research and found <a href="https://www.youtube.com/watch?v=z1Ej3nJz43c"><b>this</b></a> useful video.
I followed the suggested steps, and added a FabLab logo to my design (Fig. 2):<br>
1. Make a black and white version of the logo from the colored one (I used gimp for this).<br>
2. Saved the image as a 16-color bitmap format.<br>
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11. If the size does not fit your design, you cannot change it on the PCB layout
and must go all the way back to step 2,
change the image size before saving it and redo all the steps.<br>
I used 0.2-0.5mm V-shape milling and followed a milling process similar to Electronics Design week.
I used 0.2-0.5mm V-shape milling and followed a milling process similar to <a href="week6.html"><b></b>Electronics Design</a> week.
</p>
<div class="img-container"><img style="width: 780px;" src="../img/assignments/w10/2.jpg" alt=""><br> <br><b>Figure 2. </b>The PCB layout and fabricated board.</div>
</div>
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I wrote a simple code in Arduino IDE to test the sensor. The code is fairly simple,
it reads the value from the analog pin, which sensor is connected to. Then, it calculates
the actual temperature according to
the formula was mentioned above and sends it to the computer via serial communication.
the formula was mentioned above and sends it to the computer via serial communication. The programming process is described in details
in the <a href="week8.html"><b>Embedded Programming </b></a>week.
</p>
<div class="img-container"><img style="width: 700px;" src="../img/assignments/w10/4.jpg" alt=""><br><b>Figure 4. </b>Code and result.</div>
</div>
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</p>
<div class="img-container"><img style="width: 600px;" src="../img/assignments/w10/5.jpg" alt=""><br><b>Figure 5. </b>Probing with multimeter.</div>
<p>
The code written for programming the ATTiny44 is shown in Fig. 6 The ADC has a 10-bit dynamic range covering 5V, meaning that the ADC result is Rtx1024/(Rt + R1). My code returns 29 as the analog to digital conversion.
The code written for programming the ATTiny44 is shown in Figure 6. According to the ATTiny datasheet, it has eight 10-bit ADC channels on
the pins 6-13 covering 5V range (I connected the temperature sensor to pin 6 of the microcontroller). It means that the ADC result is Rt×1024/(Rt+R1). My code returns 29 as the analog to digital conversion.
The temperature readings were of course higher than the environment temperature due to the test board heating up during operation.
</p>
<div class="img-container"><img style="width: 400px;" src="../img/assignments/w10/6.jpg" alt=""><br><b>Figure 6. </b>Measurement code.</div>
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• RGB display LEDs for tracking timer’s on/off state and the remaining time.
</p>
<p>
I could not find any similar projects in Fab Academy. This is probably because
I could not find any block heater related project in Fab Academy. This is probably because
the problems that I am trying to solve with this design are very specific
to northern countries like Finland. Having lived most of my life in a much southern
country, I had never heard of block heater either, before moving to Finland a few years ago!
I did all the design and implementation of the smart block heater on my own,
and I did not use any code or design from previous students of Fab Academy.
I did all the design and implementation of the smart block heater on my own.
However, I used a few Arduino libraries for my sensors and outputs,
which I referenced in the explanation of the development process.<br>
The electronic part of the project was not new for me.
The design of the electronic part of the project was not new for me.
I had worked with different temperature sensors before. For example, in my Electrical Engineering Master's Degree project,
I used an LM35 and a PT100 to measure the temperate variation
on each side of a Thermoelectric Generator. I also had driven multiple AC loads (e.g. coil, heater, lamps, etc.) up to 16A using
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<h3 class="mt-4">Materials & Components</h3>
<p>
The material and components that I plan to use mostly come from Fablab Oulu's inventory.
In the following table, a list of the material and their prices is given. Therefore, the prototype is fairly cheap!
In the following table, a list of the material and their prices is given. Therefore, the prototype cost is 57 euro.
More detail about the components' and materials' features in the <a href="http://.../"><b>Project Development page</b></a>.
</p>
<div class="img-container"><img style="width: 700px;" src="../img/assignments/w12/2.JPG" alt=""><br><b>Figure 2. </b>Materials and Components
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