It uses a PWN/Servo shield soldered onto an Arduino Uno connected to 8 servo motors (TowerPro SG90s) to control each of the spray bottles. A table converts every character into 5×8 bit fonts to ...

SB Servo motors have been created to offer affordable, powerful and open-source digital servo motors with Torque, Speed, Position Feedback and full 360-degree rotation mode.

That’s where the servo motor comes in. ... You can drive them directly from an Arduino or similar microcontroller using a library that converts an angle into a PWM signal on one of the output pins.