09-11-2021, 11:26 AM
Hi Igorvin, sorry you are having trouble, it's looking like the PCA9685 might be defective but it seems odd it has the correct I2C address. Because the pH is working we know the I2C is sending and receiving data and all the DC ports are independent components so it's not likely them.
The +12v pins on DC ports are always live, the Ground pin is switched.
I circled a few pads on the board, the red is DC 4, pin 12, see if you have any voltage there, that point is coming out of the PCA9685. I circled some ground pins in black that you can use. The blue circles are DC 5, 6 and 7, pins 11, 10 and 9, check those as well.
It's very unlikely, but you could try going to the "admin" tab in reef-pi and press the "reload" button.
Maybe check a few LED ports as well as those are controlled via the PCA9685 as well.
![[Image: DC-ports.jpg]](https://www.robo-tank.ca/pictures/Troubleshooting/DC-ports.jpg)
The +12v pins on DC ports are always live, the Ground pin is switched.
I circled a few pads on the board, the red is DC 4, pin 12, see if you have any voltage there, that point is coming out of the PCA9685. I circled some ground pins in black that you can use. The blue circles are DC 5, 6 and 7, pins 11, 10 and 9, check those as well.
It's very unlikely, but you could try going to the "admin" tab in reef-pi and press the "reload" button.
Maybe check a few LED ports as well as those are controlled via the PCA9685 as well.
