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Small rectangular servo with black plastic casing and white output horn

Adafruit

Adafruit ADA-154 Continuous Rotation Servo Futaba S148 OEM

SKU CH-T354-5V4V0

Continuous rotation servo drives wheels or mechanisms at 60 rpm with 3.40 kg-cm torque and includes a single horn

  • TypeOther
  • Continuous rotation for simple robot drive systems
  • Arduino Servo library compatible on pins 9 or 10
  • 60 rpm no-load speed at 5 V supply
  • 40 kg-cm torque for light mechanical loads
  • Recessed potentiometer allows quick stop-point calibration

Continuous Rotation Servo ADA-154

The Adafruit ADA-154 is a continuous rotation servo based on the Futaba S148 design. It rotates fully forward or backward instead of moving to a fixed position. Hobbyists building simple moving robots can control it with any standard servo code, hardware or library. It arrives new with a single horn included.

Installation uses standard three-wire connection

Connect the white control wire to a digital pin such as 9 or 10 on an Arduino and use the included Servo library. The servo may require calibration; adjust the recessed potentiometer with a small screwdriver while sending a stop command until movement ceases. Position 0 at 1.5 ms pulse stops the motor, while 90 and -90 at 2 ms and 1 ms pulses drive full speed forward and backward respectively.

Practical limits of the servo interface

Operation at 5 VDC is recommended with a 6 VDC maximum. At 5 VDC with no load the output reaches 60 rpm and delivers 3.40 kg-cm of torque. The unit weighs 45.0 grams and measures 40.5 x 20.0 x 38.0 mm. Builders needing positional feedback or higher torque for heavy loads should consider a different actuator type.

Highlights

  • Continuous rotation for simple robot drive systems
  • Arduino Servo library compatible on pins 9 or 10
  • 60 rpm no-load speed at 5 V supply
  • 40 kg-cm torque for light mechanical loads
  • Recessed potentiometer allows quick stop-point calibration

Specifications

BrandAdafruit Industries
ModelADAID-154
Part NumberADA-154
TypeOther

Questions about this item

How do I verify the servo stops at the 1.5 ms pulse after wiring it to an Arduino?

Send position 0 (1.5 ms pulse) and adjust the recessed potentiometer with a small screwdriver until the output shaft stops rotating.

What accessories are included and which common items are not supplied?

One servo horn is included; mounting screws, wiring, a screwdriver for calibration and a 5 V power source are not included.

Which model should I choose for a lightweight robot needing about 60 rpm and 3.40 kg-cm torque?

The ADA-154 continuous rotation servo matches those specifications at 5 V.

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