<p>Brick-to-brick communication is not possible using the EV3 Classroom software. You will need to use a different programming environment.</p>
<p>The broadcast blocks in EV3 Classroom (and other Scratch-based programming languages) only send messages between stacks of blocks within the Scratch program. They do not send messages to other connected EV3s.</p>
<p><a href="https://i.sstatic.net/Vu131.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Vu131.png" alt="screenshot of scratch broadcast blocks" /></a></p>

CC BY-SA 4.0
2022-03-05T18:27:33.140Z
2022-03-06T21:35:20.747Z
2022-03-06T21:35:20.747Z
David Lechner
<p>I have a big robot that needs four big motors to drive it and two small motors for other functions -&gt; I need two bricks to communicate with each other because they need to use the same sensors.</p>
<p>I get the bricks connected via Bluethooth, but when I send messages with the &quot;send message&quot; and &quot;when I receive message&quot; block, the other brick does not respond.
What could be the reason for this?</p>
<p>I use:</p>
<ul>
<li>Both bricks with 1.09H</li>
<li>EV3 Classroom (1.5.3)</li>
<li>The bricks have different names</li>
</ul>

<ev3><bluetooth><connections>
Connected EV3 bricks don't react (EV3 Classroom)
Thomas
# Connected EV3 bricks don't react (EV3 Classroom)

(Asked by: username_0 on 2022-03-05)

I have a big robot that needs four big motors to drive it and two small motors for other functions -> I need two bricks to communicate with each other because they need to use the same sensors.

I get the bricks connected via Bluethooth, but when I send messages with the "send message" and "when I receive message" block, the other brick does not respond.
What could be the reason for this?

I use:

* Both bricks with 1.09H
* EV3 Classroom (1.5.3)
* The bricks have different names

**Tags:** ev3, bluetooth, connections


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## 1 answers

### Answer by username_1 on 2022-03-05. Score: 2

Brick-to-brick communication is not possible using the EV3 Classroom software. You will need to use a different programming environment.

The broadcast blocks in EV3 Classroom (and other Scratch-based programming languages) only send messages between stacks of blocks within the Scratch program. They do not send messages to other connected EV3s.

[![screenshot of scratch broadcast blocks](https://i.sstatic.net/Vu131.png)](https://i.sstatic.net/Vu131.png)


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