Esp32 Led won't stop blinking if external power are used

[paulohz2]

Hi, I'm new here and also with the esp32.
I acquired two pieces not long ago and started playing with them. And now I'm having a problem with them, when I use an external power supply that's not usb, the led starts blinking and won't stop, and the program also won't run. If I use the usb, it works flawless. Anyone could help me with that?

Thanks!!!

[ESP_Sprite]

What type of external power supply do you use and how is it connected? The ESP32 needs a power source that can source at least 500mA to function well.

[paulohz2]

What type of external power supply do you use and how is it connected? The ESP32 needs a power source that can source at least 500mA to function well.

I tried some like 9v battery (with voltage regulator), 4 batteries (1,5v each) and 5v 700mah phone charger. None worked, only usb supply. BUT now I've tried the blink code on them, and it worked with those supplies, but the last code won't work. It's a bluetooth communication to control a robot car with a smartphone (l298n, esp32, 2 dc motors).

[jackdew22]

To anyone having problems like this with the DevkitC board make sure to use another GND pin besides the one next to 5V and the reset button. I wasted hours debugging this issue using the wrong GND.. simply switching to the one 5 pins down fixed everything!

[kennycoder]

To anyone having problems like this with the DevkitC board make sure to use another GND pin besides the one next to 5V and the reset button. I wasted hours debugging this issue using the wrong GND.. simply switching to the one 5 pins down fixed everything!

Thanks a lot mate. You saved me quite some time! Indeed its a stupid missprint on some boards. Should be CMD and not GND.. who knows how this passed QC.
Anyway thanks again, owe you a beer.