Smart Humidity Sensor Switch for Bathroom Fan by Martin Jerry | tasmota with ESP8285 2.4G WiFi chip, Fan Control for Home Assistant | Smart Home Devices via MQTT
Product Description
How to use it?
Wiring as a single pole smart switch (need neutral wire);Connect wifi router (tasmota standard method);Setup auto mode (set rules on the tasmota console page by following three commands):
rule1 ON AHT2X#Humidity>80 DO power 1 ENDON ON AHT2X#Humidity<75 DO power 0 ENDONrule1 5rule1 1
Note:
The numbers 80 and 75 in the command are two boundaries of when you want to turn on and off the fan.
It means the switch will turn on when humidity is over 80%, and turn off when it goes down to 75%.
You can change these two number as any number (0-100) you like.
Tasmota Pre-flashed
We already flashed the tasmota firmware inside the product. You don’t need to solder and flash by serial port.
Private Data
All of the data are stored locally, and no need to worry about the data security like other Internet cloud based devices.
MQTT
This switch support MQTT protocol, which is a standard for IoT data transmission. You can link with many different platforms and devices now.
Home Automation
Once you link it in your Home Assistant App. You can control it easily on your phone and create home automation options like sunrise, sunset, and etc.
Specification
WiFi Chip ESP8285 WiFi Band 2.4 GHz MQTT Supported Tasmota Pre-Flashed Input 100-240VAC, 50/60Hz Neutral Wire Required Circuit Type Single Pole Humidity Range 0% – 100%
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Add to Cart
Add to Cart
Add to Cart
Customer Reviews
4.1 out of 5 stars
26
4.6 out of 5 stars
30
2.6 out of 5 stars
9
1.8 out of 5 stars
2
4.2 out of 5 stars
26
Price
— $16.99$16.99 $25.99$25.99 $38.99$38.99 $36.98$36.98
Tamota pre-falshed
✓
✓
✓
✓
✓
MCU based
No MCU
✓
✓
✓
✓
Switch Type
Single Pole 3-way Single Pole 3-way Single Pole
Product Dimensions : 4.22 x 1.53 x 1.53 inches; 2.89 ounces
Item model number : US-SS02
Date First Available : June 9, 2023
Manufacturer : Martin Jerry
ASIN : B0C7L49BXL
Country of Origin : China
Installation : This wifi switch is a single pole (NOT a 3 way smart switch) wifi relay switch (not dimmer). Neutral wire and 2.4G wifi router are required
Auto & Manual Mode: At the auto mode, it can turn on/off the fan according to humidity percentage detected automatically. Users can control it manaully anytime, and this will not affect the performance of Auto mode next time.
TASMOTA : This wifi light switch is TASMOTA pre-flashed, Not Smart Life or Tuya App. ESP8266 inside can support 2.4G WiFi Only
MQTT : smart switches support MQTT to link with other smart home gadgets. Home Assistant, Alexa, and Google Home are also supported
Sercurity : All data is stored locally, and users can completely control these smart home products without worrying about data security
$25.99 $39.99
Price: $39.99 - $25.99
(as of Jan 03, 2025 06:54:44 UTC – Details)
Product Description
How to use it?
Wiring as a single pole smart switch (need neutral wire);Connect wifi router (tasmota standard method);Setup auto mode (set rules on the tasmota console page by following three commands):
rule1 ON AHT2X#Humidity>80 DO power 1 ENDON ON AHT2X#Humidity<75 DO power 0 ENDONrule1 5rule1 1
Note:
The numbers 80 and 75 in the command are two boundaries of when you want to turn on and off the fan.
It means the switch will turn on when humidity is over 80%, and turn off when it goes down to 75%.
You can change these two number as any number (0-100) you like.
Tasmota Pre-flashed
We already flashed the tasmota firmware inside the product. You don’t need to solder and flash by serial port.
Private Data
All of the data are stored locally, and no need to worry about the data security like other Internet cloud based devices.
MQTT
This switch support MQTT protocol, which is a standard for IoT data transmission. You can link with many different platforms and devices now.
Home Automation
Once you link it in your Home Assistant App. You can control it easily on your phone and create home automation options like sunrise, sunset, and etc.
Specification
WiFi Chip ESP8285 WiFi Band 2.4 GHz MQTT Supported Tasmota Pre-Flashed Input 100-240VAC, 50/60Hz Neutral Wire Required Circuit Type Single Pole Humidity Range 0% – 100%
Add to Cart
Add to Cart
Add to Cart
Add to Cart
Customer Reviews
4.1 out of 5 stars
26
4.6 out of 5 stars
30
2.6 out of 5 stars
9
1.8 out of 5 stars
2
4.2 out of 5 stars
26
Price
— $16.99$16.99 $25.99$25.99 $38.99$38.99 $36.98$36.98
Tamota pre-falshed
✓
✓
✓
✓
✓
MCU based
No MCU
✓
✓
✓
✓
Switch Type
Single Pole 3-way Single Pole 3-way Single Pole
Product Dimensions : 4.22 x 1.53 x 1.53 inches; 2.89 ounces
Item model number : US-SS02
Date First Available : June 9, 2023
Manufacturer : Martin Jerry
ASIN : B0C7L49BXL
Country of Origin : China
Installation : This wifi switch is a single pole (NOT a 3 way smart switch) wifi relay switch (not dimmer). Neutral wire and 2.4G wifi router are required
Auto & Manual Mode: At the auto mode, it can turn on/off the fan according to humidity percentage detected automatically. Users can control it manaully anytime, and this will not affect the performance of Auto mode next time.
TASMOTA : This wifi light switch is TASMOTA pre-flashed, Not Smart Life or Tuya App. ESP8266 inside can support 2.4G WiFi Only
MQTT : smart switches support MQTT to link with other smart home gadgets. Home Assistant, Alexa, and Google Home are also supported
Sercurity : All data is stored locally, and users can completely control these smart home products without worrying about data security
Based on 8 reviews
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snova –
new revision with TI HDC1080 humidity and temp sensor
So far so good. Looks like the new unit I received on Dec 18th, 2024 came with a TI HDC1080 sensor instead of the older sensor which other receivers were complaining about. Note, the Tasmota Rule1 is still set to trigger from the old sensor and not the new HDC1080. You will need to change that until Martin Jerry updates the flash builds and fixes this bug.update dec 20th, 2024. I’ve determined that the ESP8285 puts off enough heat to skew the temperature and humidity readings. As a result temperature is about 10+ degrees warmer in the wall box and thus humidity is also lower by 10-15%. Sensor is very reactive. Turn on the shower and humidity readings reacts within 2 seconds. At first I thought about returning the unit, but after further consideration I decided to keep it and adjust my Tasmota rule occurrdingly. Tasmota tempofftet -10 and humoffset 10 commands make it feel a little more closer to the actual room room environment outside the wall box. 🙂 anyhow.. the rule adjustment is good enough at least the values are mostly consistent and that is all the matters when I want to detect a sharp humidity increase as in the case of starting a shower running..
snova –
AndreC –
Great switch, however check your sensor type if rules aren’t working
I bought mine in mid Dec 2024. It came with a TI HDC1080 humidity and temp sensor, which from some quick research is actually better than previous AHT10 version. As long as the sensors are consistent, I’m not too concern if they’re super accurate.As far as sensor change, this means that the code shown on the Amazon, Tasmota, and MJ’s own site needs updated. The AHT2X needs to be changed to HDC1080. This is the updated code to make the new sensor work:rule1 ON HDC1080#Humidity>80 DO power 1 ENDON ON HDC1080#Humidity<75 DO power 0 ENDONrule1 5rule1 1Hope this helps with those who are having trouble getting the switch to work as intended.
AndreC –
KD –
Switch works. Humidity detection is wildly off.
I reflashed the switch with ESPHome, and I can see/use it just fine in Home Assistant. The humidity reported is way off (reporting 32% and the ecobee reports 51%). I believe this switch uses an AHT10 for temperature and humidity detection, and that chip is known to be very inaccurate. Iâll probably get a separate humidity sensor (what I should have done in the first place instead of spending almost 2x what the SS01 switch costs).My other gripe is that the sensor hole is now a big square and not a small hole. Time will tell if that will be an issue with wet hands in the bathroom near the shower.
KD –
D. Shanske –
Nice looking device but hoping for a future revision
Love the look and the idea of this, but have had some issues with the accuracy of the temperature and humidity sensors. Martin Jerry correctly noted that the sensor isn’t so much for accuracy but for activation on higher humidity… but feel like there should be a way to get better readings.. perhaps with a different sensor and design.
D. Shanske –
Mark –
Be careful updating firmware
I bought this for my bathroom so the exhaust fan comes on when there is too much humidity in the bathroom. Been working great so far. My only real complaint is the restart button is too close to the switch, it’s part of the frame around the button.I did run into an issue, my fault in a lot of way. I work in IT and generally keep things up to date. I tent to, out of force of habit, update the software/firmware on just about everything.Well I found when I updated the switch that the sensors no longer worked. The firmware updater for Tasmota has a field for either downloading from a website or uploading your own file. Well the default link is for the base version of Tasmota. It doesn’t include support for sensors in the base package. You have to build your own version to have sensors.To fix I had to update it with the “minimal version” of Tasmota. It didn’t have enough memory to do a direct update. Then I was able to update with the firmware downloadable from the Martin Jerry site. After a settings reset I was able to use without a problem.
Mark –
A K –
Did not work out of the box
Straight out of the box, this did nothing more than the job of a regular physical switch.To get it to actually control the switch based on the humidity, you have to log into a console and enter commands to set the thresholds. Not a job for a regular consumer. I did it but it still does not respond to ambient humidity levels. It’s just a plain switch so far.
A K –
Kanat M. –
Difficult for average user to code
Itâs very difficult for average user to program device. If you are not a person who deals with programming (even simple programming) you should buy something else. Itâs not just matter of changing settings, itâs like coding.
Kanat M. –
worldenemy –
Not for average Joe
I didn’t read that this need to enter the cmd manually before I ordered it. Not my first Tasmota device so I didn’t have any issue setting it up and connect it to Home Assistant. But the humidity sensor is not accurate at all. I will replace it with a regular switch and a separate low cost temp/humidity sensor.
worldenemy –