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This is what's said at 14'09" in this video
Same question for the LEDs : should they be protected with resistors ?
The brain v2 takes care of all this for you! If you look near each button header there is a pull down resistor. 1 for each header represents one for each row. Then there are current limiting resistors inline with the transistors for the LEDs.This video was for the Brain v1 which is why some info is outdated for the v2.
Great ! thanks for answering.
Yes absolutely diodes are still needed.
It needs to be one diode per button. :)
Ok ! sorry for being such a skeptical wet blanket.