Hello,
I have simple wireless system - one AP and 3 Station bridge
I want to press on one button at the AP and to light a led on the first station.
this why , every time I will press on a different button a different router will light
can I do this - even if it's mean to connect a device to the RS232 or even to the Ethernet
?

Thanks ,

Hello I dont know if there is a rs232 mikrotik workaround to do this, but I have done that using ethernet arduino uno, you need one of them on every mikrotik, 5 in total.

it's too expensive for what I need
Do you know this part? - http://www.pjrc.com/teensy/?
It's can connect to the router with USB
is there any why I can know if it's working with Mikrotik devices?

Please look at this http://www.ledon.pl/en/gsm/2460-lan-kontroler.html
English manual (for an older version of firmware) http://www.tinycontrol.pl/forum/downloa ... n_v210.pdf
For example I use it at home for temp. control via MT scripts (fetch http command can read and set I/O ports, 1-wire etc).

I have a few teensy over there, I have successfully communicate from PC to Teensy using USB and linux, but dont know about Mikrotik.

By the way Arduino for what you need: http://www.ebay.com/itm/UNO-ATMEGA-328- ... 4ac0b78baa
28 usd each shipped.

dbdom solution seems similar to arduino but it costs around 31 usd + shipping.