> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 9g Continuous Rotation Servo - FS90R (1.5kg/cm)

**Type:** Product page · **SKU:** CE09377 · **Brand:** [Feetech](https://core-electronics.com.au/brands/feetech)
**Page:** https://core-electronics.com.au/feetech-1-5kg-continuous-rotation-servo-fs90r.html ([markdown](https://core-electronics.com.au/feetech-1-5kg-continuous-rotation-servo-fs90r.html.md))

Continuous rotation servos are perfect for adding small form factor motors and wheels to robots.

## Pricing

- **Price:** $5.15 (inc GST) — $4.68 AUD, exc GST
- **Quantity discounts:** 6+ $4.31 (exc GST) · 50+ $3.98 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 478 today; more stock is typically available with a 10–16 day lead time.

## How to buy

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## Description

Create your own small form-factor robot with these FS90R servo motors.

Adjust the zero or middle point by adjusting the potentiometer underneath with a screwdriver. A middle point is a pulse width where the servo motor isn't moving. Higher pulse widths will start the motor moving in a clockwise direction and lower, counter-clockwise.

Grab a couple of [these sweet wheels ](https://core-electronics.com.au/fs90r-wheeel.html)to add motion or use the included horns to drive gears or push-rods.

If you need a bit more torque for the same size and voltage [check out this version with metal gears](https://core-electronics.com.au/feetech-fs90mr-1-8kg-digital-continuous-servo.html).

### Specifications

- Model: FS90R
- Weight: 9g
- Arm Angle Limit: No Limit
 
- Operating Voltage: 4.8V - 6V
- No load current: 130mA @ 6V
- Rated Continuous torque: 0.5kg/cm @ 6V
- Peak Torque: 1.5kg/cm @ 6V
- Stall Current: 800mA
 
- Gear Type: Plastic Gear
- Size: 22.5mm x 12.1mm x 27.7mm
- Spline: 21T
 
### Includes

- FS90R Continuous Rotation Servo
- Servo Horn and fastener pack
 
### Dimension Drawing

![fs90r dimension drawing](https://core-electronics.com.au/media/wysiwyg/product_images/fs90r-dimension-drawing.jpg)

### Examples

#### Raspberry Pi Pico - Micropython

 ```
import machine
import utime

pwm1 = machine.PWM(machine.Pin(0))
pwm1.freq(50)

min_s = 1300
max_s = 8500

mid_p = int((max_s - min_s)/2)

def map_range(x, in_min, in_max, out_min, out_max):
    mapped = (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min
    return int(max(min(mapped, out_max), out_min))

def servo_wrapper(val):
    return map_range(val, 0, 180, 1500, 8000)

# Useful while attaching servo horns
# or finding the zero-point for continuous servos

# while True: 
#     pwm1.duty_u16(mid_p)

while True:    
    for i in range(0,180,10):
        print('Angle/Speed ', i)
        pwm1.duty_u16(servo_wrapper(i))
        utime.sleep(0.2)
        
    for i in range(180,0,-10):
        print('Angle/Speed ', i)
        pwm1.duty_u16(servo_wrapper(i))
        utime.sleep(0.2)
```

### Check out our other options to make your projects move!

**Maker Favourite Servos** - Add them to all the projects where you need movement!

- [9g micro servo (FS90)](https://core-electronics.com.au/feetech-1-5kg-continuous-rotation-servo-fs90r.html)
- [Standard size servo](https://core-electronics.com.au/feetech-fs5103b-standard-servo-3kg-cm.html)
- [Servo Pack for Robotics and Makers](https://core-electronics.com.au/servo-pack-for-makers.html)

**High Power Servos** - perfect for RC and Mechatronic projects:

- [FT5330M - Aluminium Servo](https://core-electronics.com.au/feetech-ft5320m-aluminium-servo-20kg-cm.html)
- [FT825BL - Large Servo](https://core-electronics.com.au/feetech-ft825bl-large-servo-25kg-cm.html)

**Servo Accessories** - Essentials for any robotics project:

- [1m Servo Extension cable](https://core-electronics.com.au/servo-extension-cable-1m.html)
- [Simple Servo Controller](https://core-electronics.com.au/kitronik-movement-module-simple-servo-controller.html)
- [Wheel for FS90R Servo](https://core-electronics.com.au/fs90r-wheeel.html)
 
**Smart Servos** - Offload some computing and use the latest in Servo Technology!

- [STS3215 - Smart Servo (19kg/cm)](https://core-electronics.com.au/feetech-sts3215-smart-servo.html)
- [STS3045M - Smart Servo (6kg/cm)](https://core-electronics.com.au/feetech-sts3045m-smart-servo.html)
- [Smart Servo Driver board](https://core-electronics.com.au/serial-bus-servo-driver-board.html)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/c/e/ce09377-9g-contnuous-micro-servo.jpg)