I am building a 4 ch. pwm led dimmer. It's predessor used the PWM outputs from the arduino pro mini, but when ever I am filming or taking a picture I can not dim the light's and when I want to use it as a nightlight I realise there are only 256 steps. Which is not enough.
The PCA9685 is capable of 4096 steps and 1600Hz. Which is not perfect but a huge step forward.
I am not using the arduino pro mini board anymore for the first time. I want to use the bare chip. There is a lot of room on the pcb, but I have yet to do a connector or pads for programming. I ask you to check my scematic and advice one icsp & serial programming connections.
The layout is somewhat similer to the previous version. The tracks that are now under the NRFmodule will be replaced somewhere else. It wil be a double layered board so there a no problems routing. This was sort of my quick and dirty routing.