====== SUT AVR Assembler Laboratory Node Hardware Reference ======
===== Introduction =====
Each laboratory node is equipped with an Arduino Uno R3 development board, based on the ATmega328P MCU. It also has two extension boards:
  * external, analogue and digital communication board,
  * user interface board presented on the image {{ref>sutavrlabimage1}}.

There are 8 laboratory nodes. They can be used independently, but to present collaboration, nodes are interconnected symmetrically with GPIOs presented in a hardware reference section below

===== Hardware reference =====
The table {{ref>sutavrlabtable1}} lists all hardware components and details. Note that some elements are accessible, but their use is not supported via the remote lab, e.g., buttons and a buzzer.\\ The node is depicted in the figure {{ref>sutavrlabimage1}}.

<figure sutavrlabimage1>
{{ :en:multiasm:exercisesbook:avr:sut_avr_lab_node.png?600 |}}
<caption>AVR (Arduino Uno) SUT Node</caption>
</figure>

<table sutavrlabtable1>
<caption>AVR (Arduino Uno) SUT Node Hardware Details</caption>
^ Component ID  ^ Component  ^ Hardware Details (controller)  ^ Control method  ^ GPIOs (as mapped to the Arduno Uno)  ^ Remarks  ^
|               |            |                                |                 |                                      |          |
|               |            |                                |                 |                                      |          |
|               |            |                                |                 |                                      |          |
</table>

===== Communication =====
Devices (laboratory nodes) are interconnected in pairs, so it is possible to work in groups and implement scenarios involving more than one device:
  * node 1 with node 2,
  * node 3 with node 4,
  * node 5 with node 6,
  * node 7 with node 8.

Interconnections are symmetrical, so that device 1 can send data to device 2 and vice versa (similar to serial communication). Note that analogue inputs are also involved in the interconnection interface.
See image {{ref>sutavrlabimage2}} for details.
<todo @ktokarz>Inject image of interconnection below</todo>
<figure sutavrlabimage2>

<caption>SUT AVR nodes interconnection diagram</caption>
</figure>

<note tip>Nodes are interconnected in pairs: 1-2, 3-4, 5-6, 7-8. Scenarios for data transmission between MCUs require booking and the use of correct nodes for sending and receiving messages.</note>