I have looked up multiple forums, double and triple checked my wiring, made sure the physical I2C address doesn't have any solder blobs, tried using 0x41 and etc just in case, used multiple different sketches people say work, but no matter what, I can't even move one servo. The power for the board itself (VCC) is connected to 3.3V on the Arduino (though I've tried 5V), and the servo power (V+) is connected to a DC variable power supply (model STP3005H) set to 5V. SCL and SDA are connected to A4 and A5, and running an I2C scanner sketch detected it on 0x40. I have tried multiple servos, but they all seem to be limp. I'm worried the PCA isn't even taking power and that I might need to get a new one, but I don't want to waste money on a new one if the one I'm using does work. I connected the power supply to the GND/V+ terminal block, but I have also tried the V+ breakout pin on each side, and neither changes anything.
If you mean that literally then they are the wrong way round
Please post a schematic of your project, a photo of a hand drawn circuit is good enough, and your test sketch
When you post the annotated schematic include links to technical information on each hardware device. Also which micro? From that we can probably help you solve your problem.
Lol, no, SDA is in A4 and SCL in A5. And I know that's not the issue since like I said, I2C picks up the board and sees it's connected.
I don't know how to make a schematic and I cannot draw one at the moment, but PCA GND is in Arduino GND, PCA VCC is in Arduino 3.3V, SDA is in A4, SCL is in A5, terminal block GND is connected to my power supply - terminal, terminal block V+ is in my power supply + terminal, and finally my servo is connected brown (GND) side down into my PCA.
Like I said in the first post, I used numerous sketches, two of them ("servo" and "pwmtest") came with the Adafruit PWM library, and a few others came from other forums where people stated it worked. I'm not sure which one you want me to post here.
And to gilshultz, I'm using an Arduino UNO, I believe it's the R3 but I can't tell, I don't know where to find the exact model. All I know is it comes with the SDA and SCL pins on it, I've already tried those however but to no avail.
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