Power Issues (Arduino + USB Host Shield)

Other Hardware General Electronics
1

Hi,

I successfully wired an Ardunio Micro (and Nano) up to a USB Host Shield mini (can be found at circuits@home).
Everything works well when running the sketch when connected to USB (using a USB3.0 port on my computer)
But if I use a 12v powersupply on VIN pin or a USB wall charger connected to the USB port the Arduino does not start.

Do I have to "clean" the power source?

Current setup :
Arduino <-> USB host shield (directly connected)
Pin D9 - INT
Pin D10 - SS
Pin D11 - MOSI
Pin D12 - MISO
Pin D13 - SCK
Pin 3v3 - RESET
Pin 3v3 - 3.3v
Pin GND - GND

Does anyone has an idea what could be wrong?
Or what I could try to do?
Shall I try to use a voltage regulator infront of VIN ?

thanks and regards,
Tobi

2

Depends on how much current you are drawing.

If your project is drawing close to 500mA then 12V in is probably too high for Vin and the on-board regulator is shutting down.