I think they are rated for 5v only. You should be able to use uln2803 or common npn transistors to convert the 5v pwm to 12v pwmWhen I bought the relays I didn't know the differences between trigger voltage. I will just have to supply the extra pca9685s with the 12v to trigger the relays. I am planning to use the excess relays to control a remote auto water change system.