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Tutorial: Automated Bathroom Fan Control Using TP-Link Motion Switch

System Overview

💡
KS220M
Motion Sensor Switch
(Powder Room Light)
→
📱
Kasa App
Smart Actions
→
🌀
HS200
Fan Switch
(Powder Room Fan)

Overview

This tutorial shows you how to use a TP-Link occupancy smart switch to automatically control a bathroom fan. When motion is detected, the fan turns on. When the room is unoccupied, the fan turns off.

How It Works

🚶
Person Enters Room
→
👁️
Motion Detected
→
💨
Fan Turns ON
🚪
Person Leaves Room
→
⏱️
5-10 Min Timeout
→
⭕
Fan Turns OFF

What You’ll Need

TP-Link KS220M – Motion Sensor Switch with Dimmer & Ambient Light Sensor

TP-Link HS200 – Smart Fan Switch (Standard On/Off)

  • Kasa app installed on your smartphone
  • Both switches added to your Kasa account and connected to Wi-Fi
  • 2.4GHz Wi-Fi network (5GHz not supported)
View KS220M View HS200

Setup Steps

1Install and Configure Your Switches

⚠️ Safety First!
Always turn off power at the circuit breaker before working with electrical wiring. Use a voltage tester to confirm power is off. If you’re unsure about electrical work, hire a licensed electrician.
  1. Install both smart switches according to TP-Link’s installation instructions
    • The KS220M requires a neutral wire and has built-in motion/ambient light sensors
    • The HS200 requires a neutral wire and works as a standard on/off switch
  2. Add both switches to your Kasa app
  3. Name them clearly:
    • Motion switch: “Powder Room Motion” or “Powder Room Light”
    • Fan switch: “Powder Room Fan”

2Configure the Motion Switch Settings

  1. Open the Kasa app and tap on your KS220M motion sensor switch
  2. Tap the settings gear icon ⚙️
  3. Configure motion detection settings:
    Motion Sensitivity: Set to Medium or High depending on room size
    Occupancy Timeout: Set to 5-10 minutes
    Ambient Light Detection: Configure if you want motion activation only when dark
    Light Response: Configure as desired for the connected light

3Create the Fan Automation

Using Kasa Smart Actions:

  1. In the Kasa app, tap the Smart tab at the bottom
  2. Tap the + button to create a new Smart Action
  3. Select When Device Status Changes

Configure the “Turn On” Rule:

  1. Name: “Powder Room Fan On”
  2. Trigger: Select your KS220M → Choose “Motion Detected” or “Switch Turns On”
  3. Action: Select “Powder Room Fan” (HS200) → Set to “Turn On”
  4. Save the automation

Configure the “Turn Off” Rule:

  1. Create another Smart Action
  2. Name: “Powder Room Fan Off”
  3. Trigger: Select your KS220M → Choose “No Motion Detected” or “Switch Turns Off”
  4. Action: Select “Powder Room Fan” (HS200) → Set to “Turn Off”
  5. Save the automation

4Test Your Setup

  1. Walk into the powder room and trigger the motion sensor
  2. Verify the fan turns on within a few seconds
  3. Leave the room and wait for the occupancy timeout period
  4. Verify the fan turns off automatically

Troubleshooting

Fan doesn’t turn on:
  • Verify both switches are online in the Kasa app
  • Check that Smart Actions are enabled
  • Test manual control of the HS200 fan switch
  • Review motion sensor sensitivity settings on the KS220M
Fan turns off too quickly:
  • Increase the occupancy timeout in KS220M motion sensor settings
  • Consider using Home Assistant for custom delay timers
Motion sensor too sensitive or not sensitive enough:
  • Adjust sensitivity setting in the KS220M switch configuration
  • Ensure the sensor isn’t facing windows or heat sources

Tips for Best Results

💡 Pro Tips:
  • Position the KS220M to reliably detect entry to the powder room
  • Set occupancy timeout to 5-10 minutes to account for typical bathroom use
  • Test during actual use and adjust timing as needed
  • Consider manual override capability – users should still be able to control the HS200 fan switch directly if needed
  • The KS220M ambient light sensor can prevent the fan from activating during daytime if desired

✅ Setup Complete!

This setup creates a hands-free bathroom fan experience that helps maintain air quality while saving energy by ensuring the fan only runs when needed.