Beginners • Pico 2, all 3v3 pins should be the same.. right?

Hello.
I connected a PCA9685 board to my RPi Pico 2 and I'm trying to configure it using Thonny and microPython. When I connected SCC to GP15 the Pico disconnects abruptly and the power led on the PCA shuts off. Tried to look up guides, compiled different scripts, even switched to another PCA9685(I bought 3 for my project), and whatever my noob self was able to do . Eventually I see a youtuber that has another pinout.
My top right pinout was as following:
VBUS: unconnected
VSYS: unconnected
GND: connected to PCA9685 GND
3v3: connected to PCA9685 VCC
3v3: unconnected.
The youtuber wired the VCC to the 3v3 below mine and behold, it is now properly connected with all 4 pins while Thonny is open. The script to detect the PCA9685 now works :

from machine import Pin, I2C

i2c = I2C(1, scl=Pin(15), sda=Pin(14), freq=400000)

devices = i2c.scan()
if devices:
print("I2C devices found:", devices)
else:
print("No I2C devices found")

>> correctly prints "I2C devices found: [64, 112]"
I switched back to the other 3v3 and nope, disconnects and the power led on the PCA shuts down

Is my Pico 2 defective?
When the next package arrives I'll have to connect a HC-12 433MHz radio for the rest of my project (I'm trying to motorize my windows stutters) and I plan to use the 3v3 pin. Should I be worried it won't work or worse, it will fry the HC-12? Or is there a known issue caused by using GND and 3v3 close to one another?

Thank you

Statistics: Posted by konsotre — Sun Dec 15, 2024 12:33 am

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