I have a project, I won't tell it here. The point is I have to make a communication scenario of WSN nodes, so I bought many pro-mini(s) and nrf24l01 as the wireless module. I just knew that my pro-mini(s) is 5 volts edition, so I can't connect it to nrf's 3.3volts input directly. Then, I tried to connected the pro-mini with LM 317 regulator before facing the nrf's input, to breakdown the voltages to 3.3 volts. I configured it in my bread board, and it worked well! But, the problem is coming when I made the circuit in PCB layout, they can't communicate each others! Even, a node made my windows get blue-screen.
Did I make a wrong layout?? Or anything else?
I attached the layout on the download link,
Here is my hardware config with Mirf library to connected the nrf:
Pins:
Why not use a fixed 3.3 volt regulator, and lose the other two resistors? 3.3v 1117-series regulators are cheap as dirt.
So you've supplied 3.3v to the power of the NRF's - but you have not level-shifted the signals, and the NRF's IO pins are not 5v tolerant, so you've probably trashed the NRF's. I'll betcha the chip is getting hot too.
You need to use a level shifter of some sort. A pair of resistors as a voltage divider can be used. You need to shift all ones that are outputs from the Arduino side (but not the ones in the other direction, eg, MISO)
DrAzzy:
So you've supplied 3.3v to the power of the NRF's - but you have not level-shifted the signals, and the NRF's IO pins are not 5v tolerant, so you've probably trashed the NRF's. I'll betcha the chip is getting hot too.
I wonder if they are not 3.3V tolerant. I was thinking the same but the (preliminary) datasheet (for the plus version) states differently.
