I bought a Pololu A-Star 32U4 Mini SV, Pololu A-Star 32U4 Micro and a 5V up/down stepper (D24V22F5).
I installed them on a Breadboard and connected VIN of al three items to to12V. On both Pololu the led starts blinking. when I connect usb to programm the Pololus both of them get hot and stop working.
The only additional item I connected was a neo_pixel. Neo_Pixel was connected to 5V output of the 5v downstepper, ground to common ground and the DIN to one Port of the Pololu.
Is there a known Issue with connecting usb and VIN at the same time?
I ordered the Items again but I just would like to know what went wrong? It is not in my mind to destroy the new one again.