Temp Monitor 1 2 4

• Temp Monitor 1 2 4 Esv
• Temp Monitor 1 2 4 8
• 2 Monitors 1 Pc

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We live in a world where everything is connected. One day, I wanted to know the temperature of my house when I'm outside to check if the heating regulator is working or not. Already having a bluetooth Xiaomi Mijia lywsd03mmc thermometer, I was looking for something cheap and tiny to do connect to the thermometer and do the job.

I did some research and found a chip called ESP32. This chip has integrated bluetooth and WIFI. It is very tiny (3cmx6cm). Also, very easy to program using some known tools like arduino or esphome. Therefore, I decided to give this a try and I bought it for 4$.

Requirements

• ESP32-DevKitC board : Buy here from aliexpress
• Xiaomi Mijia Thermoemter v2 with battery : Buy here from aliexpress

Amazon:

• ESP32-DevKitC board: Buy here from amazon
• Xiaomi Mijia Thermoemter v2: Buy here from amazon

If you find any problem during this tutorial: Please leave a commment and I will reply very soon!

Your support is precious ! Please give me support by subscribing to my Youtube channel my youtube channel

ESPhome introduction

I am not a big fan of hardware programming and flashing… So I've looked for existing tools that configure easily ESP32 to connect to the Xiaomi mijia. ESPhome was one the easiest tool because it requires no code, but only configuration is need. ESPhome is a tool, with a set of predefined modules and configuration, that can generate the wanted code for esp32 chip. Example:

• Connect to a Xiaomi BLE thermometer
• Measure the temperature using DHT sensor
• Detect the presence of BLE tag
• Turn on/off light

In addition, ESPhome can easily add a webserver to ESP32, configure wifi, update the code Over-The-Air (OTA).

ESPhome configuration

Let's create the configuration for connecting ESP32 to the Xiaomi Mijia lywsd03mmc. ESPhome is based on yaml configuration. livingroom.yaml file:

Temp Monitor 1 2 4 Esv

If you read at the configuration above, you can notice how basic and clear it is. Only 2 fields are to be defined : mac_address and bindkey of the xiaomi_lywsd03mmc.

Temp Monitor 1 2 4 8

Find Xiaomi Mijia information

In order to connect to the thermomter, we should provide its bluetooth mac address. But, the Xiaomi LYWSD03MMC send crypted data, using a bindkey that we should provide too.

Finding Mac Address

Find the MAC address using the bluetoothctl command:

Find the bindkey

There is many ways to get a bindkey.

• The first one is to follow the ESPhome instruction. (I had some problems with Android 11 and didn't work)
• Use a tool that I used and worked perfectly:
  • On your mobile, go to https://atc1441.github.io/TelinkFlasher.html
  • Enable bluetooth
  • Click on connect at the top of page
  • A list of bluetooth nearby devices will apear, click on your LYWSD03MMC device
  • Once connected, click on Do Activation
  • Wait few seconds, and then you should see Mi Token and Mi Bind Key filled.

Now go back to the yaml configuration and fill the mac_address and bindkey.

Flash the ESP32 with the configuration above

Run ESPhome using docker

Now that we have a correct configuration, let's flash the ESP32. Connect the chip to your computer using USB cable. I've used ESPhome using docker compose.Create a directory for your project. In this directory, add the following docker-compose.yaml file. Also create a directory called config inside it.

In this config directory add the livingroom.yaml that we have defined before.

Iridient developer 3 3 6 download free. The files tree should look like this.

Here is the docker-compose.yaml file.

Run the ESPhome using the command docker-compose up -d Rottenwood 1 1 download free.

Flash the configuration

• Connect to a Xiaomi BLE thermometer
• Measure the temperature using DHT sensor
• Detect the presence of BLE tag
• Turn on/off light

In addition, ESPhome can easily add a webserver to ESP32, configure wifi, update the code Over-The-Air (OTA).

ESPhome configuration

Let's create the configuration for connecting ESP32 to the Xiaomi Mijia lywsd03mmc. ESPhome is based on yaml configuration. livingroom.yaml file:

Temp Monitor 1 2 4 Esv

If you read at the configuration above, you can notice how basic and clear it is. Only 2 fields are to be defined : mac_address and bindkey of the xiaomi_lywsd03mmc.

Temp Monitor 1 2 4 8

Find Xiaomi Mijia information

In order to connect to the thermomter, we should provide its bluetooth mac address. But, the Xiaomi LYWSD03MMC send crypted data, using a bindkey that we should provide too.

Finding Mac Address

Find the MAC address using the bluetoothctl command:

Find the bindkey

There is many ways to get a bindkey.

• The first one is to follow the ESPhome instruction. (I had some problems with Android 11 and didn't work)
• Use a tool that I used and worked perfectly:
  • On your mobile, go to https://atc1441.github.io/TelinkFlasher.html
  • Enable bluetooth
  • Click on connect at the top of page
  • A list of bluetooth nearby devices will apear, click on your LYWSD03MMC device
  • Once connected, click on Do Activation
  • Wait few seconds, and then you should see Mi Token and Mi Bind Key filled.

Now go back to the yaml configuration and fill the mac_address and bindkey.

Flash the ESP32 with the configuration above

Run ESPhome using docker

Now that we have a correct configuration, let's flash the ESP32. Connect the chip to your computer using USB cable. I've used ESPhome using docker compose.Create a directory for your project. In this directory, add the following docker-compose.yaml file. Also create a directory called config inside it.

In this config directory add the livingroom.yaml that we have defined before.

Iridient developer 3 3 6 download free. The files tree should look like this.

Here is the docker-compose.yaml file.

Run the ESPhome using the command docker-compose up -d Rottenwood 1 1 download free.

Flash the configuration

Now that your ESPHome is running, go to http://localhost:6052. You should see an interface with livingroom item appearing.

On the top right, click on the select menu and choose USB for the first flash.Then, click on Validate to check that your structure is ok and Upload to run the flash.

If all is successful, you will see a log that looks like the photo above.You can read the logs and wait until you see that humidity and temperature.

2 Monitors 1 Pc

Otherwise, go to http://livingroom.local/ to see a webpage with the requested information.

UPDATE Home asssistant integration

I have wrote a new article on how to install home assistant and how to configure it

Conclusion

If this tutorial was helpful, please leave a comment and tell me your opinion.In the next tutorial I will show you how to access the temperature data when you are outdoor.

I wish you good luck with ESP32!