Is it possible to somehow connect a cooler to the RBM33G? If possible, how to do it?

Could you specify what "cooler" means for you as M33G has heatsink installed.
What and where do you want to add this "cooler"?

He said "connect", so, I'm assuming that you want to connect a fan. The question is what voltage can support the board and where you can connect it if is supported.

Regards.

Of course you can.
Something like this:
https://www.amazon.com/Dorhea-Raspberry ... ef=sr_1_3#

Could you specify what "cooler" means for you as M33G has heatsink installed.
What and where do you want to add this "cooler"?

The radiator is not enough. Hot weather and a heavy load on the modem that is inserted into the router. Therefore, I would like a "fan".

Of course you can.
Something like this:
https://www.amazon.com/Dorhea-Raspberry ... ef=sr_1_3#

Yes, I would like to connect something like such a fan. But where? What pins?

There is a description of GPIO's pinout.

You need some voltage + GND depending of the fan you will install.

Probably you can use Pin 4 to positive and Pin 6 to negative using a 5v fan.

Regards.

There is a description of GPIO's pinout.

You need some voltage + GND depending of the fan you will install.

Probably you can use Pin 4 to positive and Pin 6 to negative using a 5v fan.

Unfortunately, I can’t visit the forum often now, but I’m still interested in this topic. Thanks for your tips. Unfortunately, I haven’t had time to try your advice yet, but I intend to do so in the near future. Today I found the following information: https://help.mikrotik.com/docs/display/UM/RBM33G
It describes working with pins 12,13,15,16. And it is written that they can be switched to work from the IoT menu. But what about the rest of the pins? In your drawing there are reserved ones: 7,8,10,11,18,19,21,22,23,24,25. These pins interest me because I would like to configure how to turn the cooler on/off and perhaps even adjust the speed. If, of course, this can be done. Perhaps you need to use other pins than the ones I indicated. As option 3 and 5.
In addition, I am interested in the possibility of connecting a beeper.

I'm interested in this too, it would be especially interesting to use GPIO to control an external relay. But no one says anything here...

GPIO pinout
M33 pinout is shown below:



All output pins are open drain.

Digital input voltage is 0 to 3.63 V max.

To receive a logical "0" on the pin, the voltage should be between 0 to 1.4 V.

To receive a logical "1" on the pin, the voltage should be between 1.41 to 3.63 V.



By default pins 12,13,15,16 are configured for the second "serial1" port usage:
They can be resigned for GPIO usage in /iot/gpio/digital menu with following commands: