Hi, im new to arduino but not a complete nood to electronics. Background on my project is that it has a buck converter set to 6.99V and feeding the VIN , while veiwing serial print with my phone i had the USB cable plugged in when i noticed the contrast on my lcd screen go very white, then my arduino stoped functioning , only powers on via the USBC port now....why? I know not to use the usb and the 5v pin in combination, but how is one supposed to power the circuit while looking at lines of code?
I have a set of conflicts that only ocur during certain circumstances and need to see whats up in real life, not just on the bench.
How do i avoid this issue and acomplish my task?
Didnt think the voltage regulator should have failed here.....is it repairable? Or should i just toss the arduino?
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An official classic Nano can be connected to Vin and USB at the same time. The reference to USBC in your post indicates that you have a clone.
Your buck converter might at that time have given a higher voltage than what you expected.
What is the input voltage into the buck converter?
Please provide a schematic of your setup.
I have been under the impression Vin needs "greater than 7.5vdc" and "less than (12 or 20, depending on the arduino.cc document you read)"
How much current were you drawing through the Nano's 5 volt regulator?
Start by disconnecting the buck input power, Arduino and connect the input to something between 12V and 24V, then measure the output, I expect it will be about 15, not sure just a swag. you need to adjust it down to about 8. I also suspect that if you got over 6 volts when connected to the 12 to 24 you fried your Arduino and possibly some of the hardware.
I have a cable I modified, I cut the red wire (+5) so it does not power anything. I can then run the Arduinos of an external power source without worry.
I also have a china USB strip that has on and off switches, when the switch is off the +5 is disconnected but D+, D-, and ground are still connected.
Let us know what you find!