I have an Arduino Nano v3 that's not showing up on my serial com ports of the PC, and it doesn't seem to be PC-related. This happened after I had been testing a BLDC motor using a 4 in 1 ESC and a potentiometer. My setup included a RaceStar BR4108 380kv BLDC, an Arduino Nano V3, 2-6s 4 In1 40A BLHeli_S ESC Dshot 300-600, a 10k potentiometer, and some jumpers. The esc receives power from a regulated benchtop power supply set to 22.2V and 4.7A. am using a 2200uF cap on the ESC BAT terminals. The pot is connected to pins A1, gnd, and 5V on the Arduino. Since I am testing one motor, the M1 signal cable from the esc is hooked up to D3, while gnd is connected to gnd on Arduino. The Arduino is getting powered via VIN from the ESC VBAT pin on the header. When I powered on the esc, everything turned up well, and I tested the motor the previous night; however, trying that in the morning, there seemed to be a small event when I tried to turn the pot. There were some crackling sounds inside the pot with some slightly visible light, while the nano lit up all its on-board LEDs (TX, RX, PWR, and L). I immediately powered off everything and unhooked the nano from the harness and plugged it in my PC, but I can't seem to detect the serial port being active as the com ports are blank on device manager. The other thing I notice is that all LEDs on the nano are lighting up immediately when it's plugged in and remain on while plugged into the PC. i need some technical evaluation and some possible repair recommendations
Read the pinned post re 'How to get the most from the forum'
Did you turn off its cloaking device? If not that makes it hard to see. What color is that red wire on the purple thingamajig?
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Hi, @Orions_Mptherland
Welcome to the forum.
Sorry but had to spread your post out.
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Can you please post images of your project/harness?
So we can see your component layout.
Thanks.. Tom... 
Somehow you fried the Nano. There is nothing to repair you just throw them away and buy a new one.
The Arduino is getting powered via VIN from the ESC VBAT pin on the header.
Vin requires a voltage between 7v and 12V inclusive, it will not work on 5V
I might check tomorrow to see if the schematic is posted. I have an idea of what it might be but I am not in to the game of guess guess.
No. It is more like toasted (note that no oil was used)
Much healthier
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