Hello.
I want to power an NRF24L01 radio module through the 3.3V output from an Arduino Nano, but I read somewhere that the 3.3 pin isn't really reliable (don't remember the reasons).
Should I make a voltage regulator or am I fine?
The module specifications are pretty clear as to voltage and current. Operating Supply Voltage 1.9 V to 3.6 V and Max. Operating Current 13.5mA. The 3V3 pin of a Nano should easily provide the max current mentioned for your radio module. While powering small motors is not recommended you should have no problem with your radio module. Can you use an external 3V3 source? Certainly but is it needed? Nope. I haven't read anywhere where using the #V# pin out was unreliable as long as you stay within its limits.
Ron
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I read that a while ago and it got me worried.
Thank you.
For the normal modules (no PA+LNA):
You should use at least a capacitor on the 3.3V pins,
better would be a separate power supply.
For the PA+LNA variants, you will need a separate power supply.
While the average current consumption of the modules is rather small,
they demand higher current while transmitting.
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