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Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface : ID 1411 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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4 Channel Motor 9 Channel Servo Shield Driver Board For Arduino Mega2560 Mecanum Wheel Smart Robot Arm Car Expansion Board - Parts & Accs - AliExpress
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