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)
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.
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.
- 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
- Add both switches to your Kasa app
- Name them clearly:
- Motion switch: “Powder Room Motion” or “Powder Room Light”
- Fan switch: “Powder Room Fan”
2Configure the Motion Switch Settings
- Open the Kasa app and tap on your KS220M motion sensor switch
- Tap the settings gear icon ⚙️
- 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:
- In the Kasa app, tap the Smart tab at the bottom
- Tap the + button to create a new Smart Action
- Select When Device Status Changes
Configure the “Turn On” Rule:
- Name: “Powder Room Fan On”
- Trigger: Select your KS220M → Choose “Motion Detected” or “Switch Turns On”
- Action: Select “Powder Room Fan” (HS200) → Set to “Turn On”
- Save the automation
Configure the “Turn Off” Rule:
- Create another Smart Action
- Name: “Powder Room Fan Off”
- Trigger: Select your KS220M → Choose “No Motion Detected” or “Switch Turns Off”
- Action: Select “Powder Room Fan” (HS200) → Set to “Turn Off”
- Save the automation
4Test Your Setup
- Walk into the powder room and trigger the motion sensor
- Verify the fan turns on within a few seconds
- Leave the room and wait for the occupancy timeout period
- 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.