User Manual

Bottom view with dimensions (in inches) of Pololu Micro and Mini Maestro

servo controllers.

The dimensions of the Mini Maestro PCBs are shown in the picture above, along with the Micro

Maestro for comparison. The mounting holes have a diameter of 0.086″and are intended for #2 or M2

screws. The vertical and horizontal distances between the two mounting holes are as follows: 1.2″ and

0.5″ for the Mini Maestro 12, 1.58″ and 0.5″ for the Mini Maestro 18, and 1.5″ and 0.5″ for the Mini

Maestro 24.

1.c. Indicator LEDs

The Maestro has three indicator LEDs:

• The green USB LED indicates the USB status of the device. When the Maestro is not

connected to a computer via the USB cable, the green LED will be off. When you connect

the Maestro to USB, the green LED will start blinking slowly. The blinking continues until the

Maestro receives a particular message from the computer indicating that the Maestro’s USB

drivers are installed correctly. After the Maestro gets this message, the green LED will be on,

but it will flicker briefly when there is USB activity. The control center application constantly

streams data from the Maestro, so when the control center is running and connected to the

Maestro, the green LED will flicker constantly.

• The red error/user LED usually indicates an error. The red LED turns on when an error

occurs, and turns off when the error flags have been cleared. See Section 4.e for more

information about errors. The red LED can also be controlled by the user script; the red LED

will be on if there is an error or if the script command for turning it on was run.

• The yellow status LED indicates the control status. When the Maestro is in auto-baud detect

mode (the default) and has not yet detected the baud rate, the yellow LED will blink slowly.

During this time the Maestro does not transmit any servo pulses. Once the Maestro is ready

to drive servos, the yellow LED will periodically flash briefly. The frequency of the flashes is

1. Overview Page 17 of 99