# 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.

## 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)