Want your devices to switch on and off automatically based on temperature or humidity—without an expensive smart hub? With the WiFi Smart Temperature Humidity Sensor Monitor Switch (eWeLink app, 7–32V or 85–250V, works with Alexa and Google Home), you get a compact, surprisingly capable module for around €9.39. The price includes VAT; there are no extra customs or administration fees on delivery. That used to be different on AliExpress, but today AliExpress settles VAT and any duties up front. Clear and predictable.
Why it’s useful
Imagine: a heater turns on when the room drops below 19°C, a fan kicks in above 26°C, or a humidifier starts when RH falls under 40%. All of this can be automated. This Scimagic-RC module connects over 2.4GHz Wi-Fi (802.11 b/g/n) to the free eWeLink app (Android/iOS), supports schedules, countdowns, “inching” from 1–3600s, and smart scenes. Voice control via Alexa/Google Home is supported. Indoors, 433MHz RF control is also available (remote not included).
What you get in practice
Two versions: “Temperature Switch” (with stainless-steel DS18B20 probe, −55°C to +125°C) and “Temperature & Humidity Switch” (also reads relative humidity 5–90% RH). Pick the right bundle. Buyer feedback (4.4/5, 18 reviews, 110+ orders) highlights quick setup and “just works”. A few note slow response (sometimes up to ~1 hour) — typically solved by checking the power module, ensuring a stable 2.4GHz connection, and reviewing interval settings in eWeLink.
Key specs in plain English
• Power: AC 85–250V or DC/AC 7–32V, or micro-USB 5V.
• Output: signal output (max input current 10A; use a suitable relay/actuator for 230V loads).
• Enclosure: self-extinguishing ABS V0.
• Environment: 0–40°C, 5–90% RH (non-condensing).
• App: eWeLink with real-time status, timers, scenes, and family sharing.
• Security: WPA/WPA2-PSK.
• Bonus: 433MHz RF (learning code) support, remote not included.
Step-by-step: live in 7 minutes
- Order the right bundle from https://s.click.aliexpress.com/e/_onEVkit and check current stock.
- Choose power: if 230V is nearby, use AC 85–250V; otherwise 7–32V DC or micro-USB 5V works.
- Place the probe where you want to measure (good airflow, away from direct sunlight).
- Pair in eWeLink: connect your phone to 2.4GHz Wi-Fi, add the device, and give it a clear name (“server rack fan”).
- Create a scene: “If temperature > 26°C → turn fan ON.” Add timers or “inching” for fine-tuning.
- Test & refine: observe response time, adjust thresholds, and add hysteresis with a second scene (ON above 26°C, OFF below 24°C).
- Share with family and, if you like, enable voice control (“Alexa, turn on the rack fan”).
Price & benefits
Great value: about €9.39 each (VAT included) and €8.80 each on 10+ units. Coupons are common, e.g., €2 off when spending €15. Everything you pay via https://s.click.aliexpress.com/e/_onEVkit is VAT-inclusive; no hidden import or “admin” fees at delivery. AliExpress pre-settles VAT and any duties, so there’s nothing extra at the doorstep.
Fair comparison — and a warning
You’ll sometimes find this exact product on “unknown” sites or dropship pages at much higher prices. Don’t overpay: always compare against https://s.click.aliexpress.com/e/_onEVkit. Another plus: AliExpress returns are usually free or reasonably priced; dropshippers often charge steep return and “handling” fees. Buy directly and safely via https://s.click.aliexpress.com/e/_onEVkit.
Tips for best results
• Use stable power and quality cables to minimize delays.
• Don’t mount the probe on hot metal or in direct sun; you’ll get more realistic readings.
• For heavy 230V loads, use a proper relay/actuator and respect the 10A limit.
• For humidity-based scenes, choose the “Temp & Humidity” version. The standard DS18B20 reads temperature only. Confirm this on https://s.click.aliexpress.com/e/_onEVkit before ordering.
Support and community
This site grew out of the many questions people asked about AliExpress on the old VraagAlex website. We keep answering and testing. “We zijn geen officiële klantenservice van AliExpress, maar helpen je graag bij vragen over dit product of je bestelling.” Join the conversation below — tell us how you use it and which scenes work best for you.
Need help — including with AliExpress?
Want someone to look over your setup, install it, or build a smart scene for you? Book home (or remote) computer help via AlexandervanDijl.nl: https://alexandervandijl.nl/🧑💻-computerhulp-aan-huis-of-op-afstand-snel-geregeld-vanuit-gouda/. We also troubleshoot AliExpress issues with you.
Support our work
If this guide helped you and you’d like more like it, you can donate at https://alexandervandijl.nl/doneer. Thank you!
Where to buy and learn more
See specs, reviews, and current offers on the product page: https://s.click.aliexpress.com/e/_onEVkit. You pay a VAT-inclusive price, with no extra customs or admin fees. Solid device, low price, big convenience.
FAQ
Is it really plug-and-play?
Yes. Add it in eWeLink, connect to 2.4GHz Wi-Fi, and create your first scene. You get timers, countdowns, and “inching” for advanced logic.
Does the base kit measure humidity?
The “Temperature Switch” measures temperature only (DS18B20). For humidity, choose the “Temperature & Humidity Switch”.
Works with Alexa/Google Home?
Yes — trigger scenes or control devices with your voice.
How about response speed?
Most users report “fast enough”; a few mention delays up to ~1 hour. Our tips: stable power, good Wi-Fi signal, correct scene settings, and—if needed—tweak the polling intervals in eWeLink.
Can I switch 230V loads directly?
The module provides a signal output; for heavier 230V loads, use a proper relay/actuator and respect the 10A limit.
What will I actually pay “at the door”?
Whatever you see in the cart at https://s.click.aliexpress.com/e/_onEVkit is already VAT-inclusive. AliExpress handles VAT and, if applicable, duties in advance; there’s nothing extra to pay to the courier.
Where can I get help if something goes wrong?
Post a comment below or book help via our home/remote computer help. Again: “We zijn geen officiële klantenservice van AliExpress, maar helpen je graag bij vragen over dit product of je bestelling.”