I'm nearly at the stage of permanently installing an Arduino Nano with a 16x2 lcd, a micro sd logger, accelerometer, data and time module. I've just finished a similar project with an Arduino Pro Mini and I used an external voltage regulator as the one on board is tiny. Should I do the same with the Nano or will the onboard regulator be okay as I am running out of space on my pcb board. As far as my external power goes, I will be using x6 AA batteries as I need a fair few hours worth of data logging.
I don't think Nano has onboard 3.3V regulator - just the 50mA the FTDI chip offers. May not be enough for an SD card.
The 5V regulator is only good for 800mA, may get kinda warm if knocking 9V down to 5V and drawing that much current.
Hmm, looks like I'll have to try and make room for the external L7805CV. I'm not sure what the maximum current is as the link for the datasheet is dead. But it says that its good for 35v so it must be more than the onboard module.
Sorry I meant version 3.0 Arduino Nano, not 3v. To note it has got a 3.3v output as well as 5v, but I wont be using that.