A servo motor controller board in this category covers two distinct jobs: multi-servo control inside a project and bench testing or centering on the bench. PCA9685 boards provide 16 channels over I²C while using only 2 signal lines, and a servo tester is for centering, checking, and sweeping servos without code or a transmitter. Standard hobby servos do not need an H-bridge motor driver, but they do need a PWM control signal and a properly sized external power supply.
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