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We're going to focus here on embedded systems and more particularly on embedded systems in the world
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of the Internet of Things.
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We usually classify embedded systems according to four characteristics, which are the power consumption,
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their computing power, their size, and finally, the price.
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So, if you try to classify the embedded systems with these four branches diagram, we notice that in terms
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of consumption, we have something that has rather low values, and that's mainly because all these systems
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are battery operated and we'd like to avoid charging them too often.
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And because of this low power consumption, combined with the fact that we need a relatively high autonomy,
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then these devices need to reduce their performances.
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So the computing power is rather low as well. For the size, they are supposed to be small because in most situation
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they will be slipped into the pocket or they will be discreetly placed on a room.
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And then as we're dealing with object produced in thousands.
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So they are relatively inexpensive.
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And when we get closer to the world of the Internet of Things, we see that these four characteristics
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tend to be even smaller.
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So, we will have something which will consume even less, which will probably have even lower computing
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power with potentially smaller size, and finally, probably something cheap.
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So let's go and see what this embedded system looks like.
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And for that, we're going to go on the Lora Alliance website where any member can register the LORAWAN
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Certified device they designed. That can be really important to have a certified product, because when
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you deploy your network, you really want to be sure of the interoperability between the device and the
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server side.
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So here we can, for example, look for a simple temperature sensor and for example, choose this one
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from Adeunis.
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You can then find a lot of information on this product and eventually download the documentation
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or the User Guide.
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That could be interesting to have a look on that one, so I would open it.
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And we can see that it has features that are very representative of what we can expect for an IoT device
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with a LoRaWAN transmission.
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Why?
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Because if we look at what is written in terms of autonomy, so battery life, then we can expect
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an autonomy of over ten years with a transfer every 10 minutes.
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There are also many features on technical specification that we will need to understand here, and that
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we will explain later in this course.
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For example, we'll speak about the spreading factor, the Downlink capability, the class of the end device
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A or C, ABP or OTAA activation mode, transmit power or sensitivity.
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So no worries.
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We'll explain that later.
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But it was just to let you know that after the next chapter, you should feel more comfortable with
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these parameters.