week18

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......@@ -11,17 +11,35 @@ This was the machine this last Thursday, just cleaned and connected. Ready to be
[Here is the link of what they made](https://gitlab.com/fablabbcn-projects/learning/the-cnc-by-the-sea/-/tree/master#the-cnc-by-the-sea)
![Interface](../images/week18/Captura01.JPG)
![guailcargüik](../images/week18/Captura01.JPG)
_just ready to draw in the sand_
### The Setup
So, the schema it's like this. They are using the Kraken. A custom CNC multipurpose machine that's connected to an Arduino Mega.
So, the schema it's like this. They are using the Kraken. A custom CNC multipurpose machine that's connected to an Arduino Mega. That CNC has a screwdriver attatched and a servomotor with a plate to perform some cleaning in the sand (or different kind of drawings)
![guailcargüik](../images/week18/Captura04.JPG)
_Ready to screw sand and your h34rt_
![guailcargüik](../images/week18/Captura07.JPG)
_Clean plate DEPLOYED_
But unless as we wanted to, the laser cannon wasn't attatched to this CNC so we couldn't play as James Bond Villains this week (_for now_)-
That machine (the arduino mega that controls it, that is) is connected to a rasberry pi.
That machine is connected to a rasberry pi.
#### Raspberry pi and microcontrollers. Similar in shape. Different in concept and purpose
![guailcargüik](../images/week18/Captura03.JPG)
_Small but powerful_
At this point I think it's important to understand the difference between a rasberry pi and a arduino (or any microcontroller). The raspberry pi it's a [micro computer](https://www.raspberrypi.org/products/raspberry-pi-4-model-b/specifications/). It has OS and it's more powerful but also it's more high level. Usually you don't need a rasberry pi to make easy programs as we can do with a microcontroller. But also that extra power can be handy for other situations. This one is a case for that.
The idea it's that rasberry pi runs several servers. Once for the CNC.js (the program that controls the CNC) and two more for each webcamera (to record what's happening)
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