Hi all
I've tried my first Nano every project after several Arduino UNO projects.
I power the NANO and the circuit using a 9V 1A wall wart and the PC usb cable.
In this configuration everything works just fine.
After I've programmed the NANO I've tried to remove the USB cable and the power led on the board turns off.
2 GND pins are connected.
Vin pin is powered by 9V
The rest of the circuit is powered by 5V using a 7805 linear voltage regulator.
I don't know what's going on since it's my first NANO project.
Do I have to connect the 5V pin? I thought it was a power output.
Can anyone help me?
p.s. I've noticed that the circuit is working just fine IF I connect the usb port to a power supply (the PC is not needed: it's needed usb power... is it normal?)
All grounds are connected
I power the NANO and the circuit using a 9V 1A wall wart and the PC usb cable.
The actual voltage (no-load) is probably around 16V. At full load (1A), the voltage would probably be near 9V. What's happening is the Nano's regulator cannot handle the current demand because of the high unregulated voltage at Vin, so it goes into thermal shutdown or current limit mode. I'm guessing that at 16V-12V, the Nano could only supply about 50-100mA max. However, if Vin was 7.5V (regulated), it could probably supply around 400mA max. As you've found, the USB cable as a 5V power source works, because it can supply up to 500mA.
Do I have to connect the 5V pin? I thought it was a power output.
No, you don't have to connect the 5V pin, but it can be used as a power input if you're not using Vin or USB. In this case, it would be recommended to have some sort of fuse protection, like PTC.
I think you need to leave 5V disconnected.
Can you put a simple program, like example led, power with 9V on Vin, no USB.
See if it runs, and if it does not measure the Vin, 5V and 3V3 pins ?
G
Vin on a Nano Every should handle the input voltage ok, it has a more efficient regulator than the classic Nano so heat should not be a problem either. Hard to tell from the picture if you have a common ground from the Nano to the power adapter.
