Part 1 covered the introduction and part 2 the mechanics. Here is part 3 that shows the electronics side.

The following block diagram shows the arrangement of the electronics.

For wifi connect a USB wifi interface to the Raspberry Pi (RPi). Connect a USB cable from the RPi to the Maestro. I connect to the RPi via SSH and I have configured my router to always assign the same IP address.

The Maestro requires a separate 5V power supply for the servos.

Connect the servos to the Maestro as follows:

  • Channel 0 = Core servo for pivoting
  • Channel 1 = Y axis servo
  • Channel 2 = Toolhead servo

Use the servo extension cables for the Y axis and toolhead servo.

Wire the microswitches as shown in this diagram. I used servo extension cables and the colors mentioned reflect that. Note that the signal wire could also be white.

The 5V connection to the Maestro is not the one on the servo connectors. There is a separate 5V and GND along the top edge. See this section of the Maestro user’s guide for details.

Solder a two pin header onto the pads for the 5V and GND. Use the two way molex connector and 0.1 inch pins to create a connector to plug onto the header. Note that the ground pin is not used, instead the ground on the servo connectors is used.