USB servo controllerUSB servo controllerThis device was designed to control standard hobby radio control servos via a PCs USB port.Standard RC servos need a power supply of between 4.8 and 6 volts. They also have a Pulse Width Modulation (PWM) signal input which controls the angle of the servo. This device supplies up to 6 such servos with a 5V supply and the PWM signal to control the servo. The combined load of your servos should not exceed 3 amps.

USB servo controller
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USB servo controller