Hello.. I have a problem displaying the values on the Serial Monitor. I connected the NeuroSky device with Bluetooth type HC-05 and when displaying the values on the Serial Monitor it shows values and symbols that are not understood... Use the Uno Ardrino, Bluetooth HC-05, NeuroSky MindWave... I linked the RX and TX to 10.11 respectively.... And I did not connect EN and state... Thanks to all
Hello,
The proverbial crystal ball is still in the dishwasher...
do yourself a favour and please read How to get the best out of this forum and post accordingly (including code with code tags and necessary documentation for your ask like your exact circuit and power supply, links to components etc).
That being said, very often when garbage is shown on the Serial monitor, it's often due to a mismatch between the baud rate used in Serial.begin() and the settings of the Serial monitor ➜ ensure they match.
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Verify:
You paired the devices.
You connected 10 and 11 to the correct pins.
Possibilities:
"NeuorSky MindWave" is a hoax.
Your brain produces nothing.
Hi,
Welcome to the forum.
Have you got the IDE monitor baud rate the same as the Serial.begin baud rate.
Tom.. 
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