Cheap DIY Temperature & Humidity Sensor that works with ESPHome & Home Assistant

Wemos D1 Mini (AliExpress affiliate) - s.click.aliexpress.com/e/_AFgAIp
Nowadays, DIY wireless smart #Temperature & Humidity #sensor that can be added in #HomeAssistant can be very easy and cheap. Especially, if you have a complete guide like this one that will show you all the steps. I will try my best to show you everything: what parts are needed, how much they cost, from where to buy them, how to connect them, how to configure them, how to install ESPHome and finally how to add your smart DIY Temperature & Humidity sensor to Home Assistant. On top if you have access to a 3D printer I will also show some enclosures that can make the sensor looks better. So, buckle your belts as we are starting with the needed parts for this DIY Temperature & Humidity sensor.
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DHT22 T&H sensor in Amazon (3pcs) - amzn.to/3qzcORi
Jumper (Dupont) wires - s.click.aliexpress.com/e/_A3YiR3
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► TIME TABLE
00:00 Intro
00:15 What will you see in this video?
00:44 What parts are needed?
01:50 How does it all cost?
02:26 How to connect D1 mini and DHT22 sensor?
03:14 How to install ESPHome add-on?
05:31 Edit ESPHome configuration for the DHT22 sensor attached to D1 mini
06:19 How to install ESPHome on the D1 Mini?
08:37 Challenge for you!
09:02 How to add D1 mini and DHT22Temperature & Humidity sensor to Home Assistant?
10:37 Possible 3D Printed enclosures
► IF YOU DON’T HAVE HOME ASSISTANT CHECK THIS GUIDE
peyanski.com/how-to-install-h...
► ESPHOME CONFIG
sensor:
- platform: dht
pin: D2
temperature:
name: "Living Room Temperature"
humidity:
name: "Living Room Humidity"
update_interval: 20s
► LINKS TO THE 3D PRINTED MODELS:
- DHT-22 / DHT22 Wall box with ESP8266 - www.thingiverse.com/thing:261...
- "Öl Broker" Wemos D1 Mini mit Sr04 & AM2301 mqtt - www.thingiverse.com/thing:514...
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► DISCLAIMER
Some of the links above are affiliate links, where I earn a small commission if you click on the link and purchase an item. You are not obligated to do so, but it does help fund these videos in hopes of bringing value to you!

[@jordanyehle8203]

This is great! Just put three together super quick. Thanks for the walk through!

[@randrewright9063]

Thank you very much for this video and information. I used your guide and all 3 sensors worked perfectly.

[@KPeyanski]

You're welcome! Great to hear that and enjoy!

[@JesseG2573]

Great video KP. love the simplicity. I have them in every room of my house, also In the attic, outside under a covered porch, and in the garage too. They work great. I keep the sensor away from the board because the module gets a bit warm and I wanted open-air temp and humidity. Also, don't forget to back up and save each ESPhome device config just in case...

[@KPeyanski]

Great tips & Great comment! Thanks :) Are you using exactly DHT22 sensors?

[@markusdick5534]

Hi KP, now i build up this sensr and all is working verry well and I enjoy your videos by homeassistant as nthing else. Thanks for your good and perfect help, Ys markus

[@tamias82]

Thanks for this, I had a great fun setting it up. Mine was giving me very wrong readings. I had to add this line to the ESPHome config and reflash it to fix the issue: "model: AM2302"

[@cbristow23]

Thanks for the video. I did have some initial difficulties and learned 2 important things: 1) if you are using a raspberry pi with Home automation already, and are using Zigbee, you may need to disconnect the zigbee dongle while first configuring the ESP. The SB ports on my Pi were very noisy. Once configured and running on wifi, no problem. 2) I needed to add a 4.7K pull up resistor (as suggested by some others if I was having difficulties. That helped the reliability of the DHT a lot.

[@EsotericArctos]

I use to make my own sensors., adding light sensors, motion and the temp and humidty all in the one device. Some even had LED's I could use as night lights. I loved it in many ways, but these days a lot of ZigBee sensors, like the little Xiaomi ones, are just as cheap and also local (no cloud needed) so I stopped doing it. Not to mention the fact the ZigBee ones can be battery and last a while between changes. That said, really great to see a new video on how to do all these sort of sensors. Most of the videos on KZbin are not very recent

[@KPeyanski]

Yes, battery sensors that are working with HA locally are no brainers. Thanks for the comment Brendan!

[@gnostyle]

helpful and smart guide: can be awesome a video with more sensors on this board ; - )

[@diederikmaes2367]

Great tutorial for people still scared of ESPHome and boards. FYI, you couldn't do an OTA install because your board wasn't on your Wi-Fi yet. After the first flash you can do all updates OTA.

[@KPeyanski]

Thanks for the comment and for the tip 👍

[@acmateriales6125]

You can't hide your acent speaking, I've noted right away you are from geniusland! Thanks bro

[@KPeyanski]

Haha, nice one ☝️ many thanks 🙏

[@throttlenerd]

Great, thanks!!!!!!!! Will try it )

[@KPeyanski]

Hope you like it!

[@McArty2]

DHT22 is good for temperature readings, the humidity though started to fail on me after a year, reading 99% almost all the time. Probably because i smoke in the room, gonna try some methods to revive it. Nice video as always, Peyanski, thank you very much!

[@KPeyanski]

Thanks Arturo, glad you like the video! Mine Dht22s are working great for over 2years already, but I’m not smoking so this could be the reason in your case indeed.

[@ronm6585]

Thank you sir.

[@KPeyanski]

As usual Ron, you are welcome :)

[@paulocesarsantos1266]

man thanks, seriously thanks, I love U!

[@KPeyanski]

Glad I could help! Did you manage to make some?

[@Kisbalta]

Hi thanks for the video, very usefull. Sometimes you need to add this line: "model: DHT22" too, otherwise you will get strange readings (at least for wemos D1 pro).

[@richardnaish5100]

😀#thowned Thanks, great work! I had to make to make a couple of small changes to the esphome config edits that you showed in the video to get accurate readings from the DHT22. I include the edited version below in case anybody else is having the same problem........ sensor: platform: dht model: DHT22 pin: D2 temperature: name: "My bedroom temperature" humidity: name: "My bedroom humidity" update_interval: 30s

[@KPeyanski]

Thanks, and enjoy your DIT TH Sensor

[@matejduriak1215]

Thanks, you saved my day

[@benoitmuller1726]

#thowned!!! Thanks for this very easy video, I manage to install my d1-mini temperature + humitidy sensor at the first time 🙂

[@KPeyanski]

Nice work! Congratulations and enjoy your T&H sensor :)

[@mattsimmons2448]

Thanks

[@KPeyanski]

Many, many thanks for the support. Please join my Discord server and ping me there! I have a little gift for you as well!

[@davidwentireland]

Great video Kiril! Last week my wife asked if I could make a temperature sensor to put in my daughter's school bag to track how cold the classroom at school was getting. Sure I said... thinking about how best to power a pi or an esp. Gee it grew into a major exercise! If I go esp I need a sd memory module and a clock module on top of figuring out power... This might take me until the summer! I will keep you informed :)

[@tovmax1]

There's no need to use esp for this. You can take plain vanilla arduino Uno or Nano along with SD card module. Plus a battery cell box with 4 AAA to power it all.

[@davidwentireland]

@@tovmax1 Thanks. Won't I also need a clock module? The unit won't be connected to the Internet and I need to log the time that the temp was logged?

[@tovmax1]

@@davidwentireland You are right, the RTC will not be superfluous for your task at all.

[@KPeyanski]

What a great challenge :) Say "Hi" to your Wife and your Kid. Wish you success and don't forget to share the end result with us 👍

[@CubE135]

Just followed your Video Tutorial. This is my first time doing anything with microelectronics and it worked perfectly! :) Thank you very much! #THOwned

[@KPeyanski]

Nice work and welcome to the club. I must warn you that this thing is addictive 😂

[@CubE135]

@@KPeyanski Haha, thank you very much :) I do have one problem. Initially, when connected to my Raspberry Pi, right after installation, the sensor reads pretty accurate data. But as soon as i disconnect it from the Pi and reconnect it to the Pi or use a Power Adapter to plug it into my wall outlet, it reads temperatures at -10°, which is far from correct. So it seems like, disconnecting and reconnecting somehow "destroys" the readings permanently. I have tried different wall outlets and different Power Adapters. But they are all 5V adapters, which should be fine according to the ESP documentation. Any Idea what is wrong here? :P

[@CubE135]

A reinstall of the ESP will fix it, but as soon as i pull out the USB from the Pi, and plug it in anywhere, its broken :(

[@arteunporro]

¡Gracias!

[@KPeyanski]

Many, many thanks :) Feel free to join my Discord and ping me there so I can give you a small reward!

[@davidmack9303]

Just got into Home Assistant, have been using your videos for guides! Thanks for the help! 2 questions. First, the dht11 appear to be slightly cheaper (I'm prefering amazon for now so I don't have to wait so long for shipping). Will these work/is there a draw back to these? Question 2. Instead of powering these with micro usb, can they be spliced into say an led strip that's running off 5volts? Thanks again for all the help!

[@nilleftw]

I couldn't get my temperature readings to go off. I realized you needed to "install" the changes, if you edit the yaml afterwards. Did an update or install, and got the temperature/humidity readings right away.

[@pcampane99]

Might be a dumb question, but I'm learning so maybe others have it as well...I've set up a few ESPresense esp32 devices and those have been fun to play with and add automations for. I've gotten this now thanks to your video (thanks, as usual)...can 1 single esp32 board (or any of them) manage ESPresense and Temperature and Humidiity, or not possible? Just curious, thanks as always for the great videos!

[@085-vaibhavgusain9]

Can I use DHT 11 sensor?

[@jasonstation]

Could not connnect to board through ESP Home with any method. I always run into problems lol. Can use Arduino IDE software with no issues tho. Any way to integrate my device into Home Assistant after setting up with IDE?

[@SayWhatnot]

Hi i don't have raspberry pi. can we use arduino uno instead?

[@MaxGoddur]

Decided to build this and was surprised that in my yaml pin: 2 is entered yet the physical wire is on D4, why is this working thought the data pin was supposed to be D2? Also can't type in D2 under pin it doesn't like that so I have to enter just 2?

[@nebulousJames12345]

I did this same setup. I tried out 6 different dht22’s and 3 different boards. The temperature was consistently lowat about 14 Celsius. And humidity stayed around 5-15%. When in reality temperature was 22 Celsius and humidity was 49%. What could be the problem?

[@vaibhavkarar8858]

I want to add pH and EC sensors in esp8266/home assistant

[@williamrosswhite]

This may be crazy, but what i really want is a body temperature sensor to turn on the air conditioning if I myself get too hot

[@BrianThomas]

What if i wanted to connct more than one temp sensor for accuracy? How do i connect it?

[@marcloehr]

#thowned thanks a lot fot this nice tutorial including every step! 😀👍

[@KPeyanski]

You're very welcome and congrats for the effort :) Enjoy!

[@ericilkwatson5557]

When I place my device in a case, the temperature reading is higher than it actually is. Can I adjust this in any way?

[@harold4113]

#THOwned Great job KPeyanski. Worked the first try.

[@KPeyanski]

Welcome to the club! Enjoy your cheap and pretty useful sensor! And don't forget to check my other DIY smart sensors videos

[@Petr.L]

hi, great tutorial. Is this or a similar simple option for integration into a homebridge? Thanks

[@KPeyanski]

If you add homebridge integration in HA and expose sensors domain it should be visible on your iOS device.

[@Petr.L]

@@KPeyanski the thing is, I don't use a home assistant, only a homebridge ... I want to make a table control with 3-4 switches and a thermometer. This method with ESPHome in HA seems quite simple to me, but if there is a homebridge or homekit device, I am referred to the finished FW on github ... I found something, but not exactly what I want ... only to make each device special and that seems unnecessary to me. 2x ESP, 2x networked devices, and all in one box. One board does it too ... in creating FW for homebridge or homekit, I don't know that at all ... is there a similar guide as for ESPHome in HA? or another option how to make a simple DIY FW? thank you and apologize for the unnecessary questions 😇

[@johankarlsson7484]

When plugged into raspberrys usb, then installed, is it possible to disconnect the D1mini from the raspberry and put it up somewhere else just providing it with power and still get the reedings throuh wifi?

[@KPeyanski]

Yes, of course :) Enjoy!

[@tartine3966]

Nice tutorial, I made 3 sensors like this, they only work after pressing the reset button on the d1 mini once (if not they read completely off values like negative temperature and 20% h). And also they become unresponsive after some time or I think after a certain number of reading. Do someone know why ? (I don't use resistors)

[@tartine3966]

So I found that adding "model: DHT22" after "platform: dht" makes the sensor read correct value right from the start without pressing reset. No more negative values. If the time out issue persists I will be able to toggle the usb power because I plugged them on a smart switch.

[@j.jordens4700]

In ESPHome 2023.3.1 it is not possible to choose "Pick specific board". Only ESP8266 and ESP 32 is available. IS there a work around?

[@KPeyanski]

Just Choose ESP8266 and you should be fine

[@yurkshirelad]

How long does the DHT22 last? I read they can dry out?

[@KPeyanski]

I have 2 DHT22 sensors working non-stop from more than 2-3 years I can't remember exactly when I install them. If they die after some time I will invest $3-4 more to just replace them

[@richardhobbs4995]

My IoT network is hidden so when i install it says it cannot find my network, i guess i should unhide it then install then re hide it again? unless there is a simpilair way?

[@KPeyanski]

I guess you have to try. Good luck

[@Mimbultonia]

Followed instructions - while the mini is online - no entities show up - so no temperature / humidity readings.It's not a Wemos unit (instead an AZ-Delivery) but at a loss as to why the dht22 is not seen. Any ideas? Thanks

[@Mimbultonia]

it appears for my particular D1 mini I need to add "model: DHT22" to the D1 mini as the auto_detect default does not seem to find them!

[@KPeyanski]

Thanks for sharing the answer. Enjoy the DIY Temperature Sensor!

[@printclubflyer]

If anyone else having this issue, restart home assistant after install. This solved it for me.

[@damiandoan3907]

Is it possible to use this sensor without plugging it into the raspberry pi usb? I want it around the house so having it connect via wifi would be ideal

[@KPeyanski]

Yes, of course! You need one USB adapter and you can plug it in any power socket.

[@paulb7990]

#THOwned but the values that I am getting are wrong. Temperature and humidity are way to low. Any idea on how to fix this?

[@KPeyanski]

Hmm not really, is it possible for you to try this with another TH sensor? Yours could be defective.

[@paulb7990]

@@KPeyanski Hi thx for your quick reply. I just tried 5 diffrent sensors on 2 diffrent controllers. The result is still the same... I guess I have to get other sensors. Any recommandations? Maybe those SHT31 that were suggested below in the comments? Anyway thanks for your work and all your great videos.

[@kcusters7559]

#THOwned Nice guide! Except my readings are off. -12 degres, but it is about 20 degre... Is there a way to correct it?

[@KPeyanski]

Hmm, something is not right. Double check your wiring ...

[@kcusters7559]

@@KPeyanski Thanks for the reply. The wiring is OK. In the code I needed to add: model: DHT22_TYPE2 Seems like I have that sensor, after trying all the other. :) Now I got a dT of about 4 degrees. I blame this on the heat coming of the ESP itself? Because I use the D1 mini with the DHT shield close to it. Thanks!

[@muhammadumair9074]

No pull up resister used. According to the document there needs to be a pull up resister between data pin and esp

[@argamartaka3059]

I've successfully made it but with DS18B20 for my koi pond, works great! The best thing is, I only spend $3. Thanks for this!

[@KPeyanski]

Nice work! Then you can freely use the #thowned tag ;) Enjoy!

[@ponciusz]

I am confused as there are people who connect 4.7k resistor and others who not? Whats the correct way?

[@KPeyanski]

For this sensor/approach you don't need resistor!

[@blakadders]

of all the sensors you chose the second worst one and the bulkiest one. Choose an I2C sensor such as SHT31, AHT25 or HTU21 instead

[@KPeyanski]

I'm using several DHT22 sensors for years and I have zero problems with them plus they are cheap. I know there are better T&H sensors out there but I don't need them for now.

[@hippopotamus86]

Spend $16 and get one that does temperature, pressure and humidity and lasts 2 years. Aqara ones are very good and tiny.

[@KPeyanski]

why so much and I guess you had back luck?

[@throttlenerd]

#thowned !!!! )))))

[@KPeyanski]

Congrats 🎉 enjoy your DIY sensor and make some more after a while…

[@grahamroberts776]

#THOwned

[@KPeyanski]

Good Job Graham, congratulations! Here is a challenge for you :) Watch my DIY Smoke Sensor video and try to make it as well. There is another hashtag there...

[@marsomike]

#THOwned

[@KPeyanski]

Oh Yes! Thanks for sharing and enjoy!

[@stephenmorgan3750]

#THOwned

[@KPeyanski]

That is so great! Enjoy your cheap & useful sensor :)

[@ladylodgers]

#THOwned

[@KPeyanski]

Good job 👏 welcome to the club!