Is it possible to turn on pins 4 to 13 all at once?

[J-M-L]

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To your question

@09tut

once? I have connected a single LED to each pin

Do you have a current limiting resistor per led? You do need that

@09tut

tell me whether is it possible to turn on pins 4 to 13 all at once

At once as at the very same nano second or just that visually they appear to turn on at the same time ? (Just issue multiple digitalWrite() in a row in the latter case)

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If you want non blocking code look at

• Using millis() for timing. A beginners guide
• Several things at the same time
• Flashing multiple LEDs at the same time