on a TLC5940 (PWM chip) daisy chain
               chip: 2,           // the third chip on the daisy chain (index 0 is the first chip)
               port: 7,           // the device is wired to pin OUT7 on the chip
            },
         },

         // output port #4
         {
            device: {
               type: "pca9685",   // an output on a PCA9685 PWM controller chip
               chip: 1,           // the second chip in the "pca9685:" configuration
                                  // array 