Beginners • RPi5 and PCA9685 problem

I have RPi5 with 8Gb RAM version, latest OS, PCA9685 and SG90 servo, which I wanted to use. First I tried to connect servo with RPi by GPIO and it was jittering (of course first I didn't know it will be, because it worked perfectly with Arduino Uno), then I check youtube and saw video where one guy told about PCA9685 module, so I bought two (just in case) and wired them as in video. Then I activated I2C through bash command and RPI menu, but when I try to send something to servo - it does nothing. At all. My wiring at the picture below. I tried also to connect VVC pin to pin2 (5V) as I saw in another video and it didn't help as well. External power on the PCA9685 is 5.24V which is ok, and LED is working when connected to RPi, servo is working while connected to the RPi. I also tried seconds PCA and another SG90 servo - they have the same result - works separately and when connected to RPi, it does nothing.
I tried to control servo with adafruit-servokit module and adafruit_pca9685, i2cdetect showing the device connected (0x40). I have no thoughts anymore what else I can do, but videos on youtube shows it works somehow with RPi, so probably there's a small thing can be which I'm not aware. I also check similar topics through the search, but not sure they're helpful for me, because same topics are already closed without links to other topics or help, and other are not quite my case. AI advise to use logical convertor 3,3V <-> 5V, but I'm not sure it is the proper solution.
Can someone help or provide good tutorial with all the possible details how to setup, please? Thank you in advance.

Statistics: Posted by PerfectDay — Sun Feb 08, 2026 5:08 pm — Replies 2 — Views 60

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