MPU9250 is one of the most popular IMU (Inertial Measurement Unit) available on the market. It combines not only 3D accelerometer, 3D gyro and 3D compass but also DMP (Digital Motion Processor). Thanks to DMP we can read orientation data in the form of Euler angles or quaternions directly from the chip.
A web page with a 3D cube visualizing orientation of MPU9250 is hosted by ESP32. Real time data from MPU9250 is sent to a web browser through a websocket. That data is then used by Three.js library (https://threejs.org/) to visualize orientation of the cube in a real time. The web page is available both in LAN and through the internet thanks to Husarnet.
To run the example, follow the next steps.
Interface between ESP32 and MPU9250 is as follows:
ESP32 <-> MPU9250 P22 <-> SCL P21 <-> SDA P19 <-> INT GND <-> GND
Remember also to provide appropriate power supply both for ESP32 and MPU9250.
To run the project, at first you need to configure your Arduino IDE:
1. Install Husarnet package for ESP32:
File -> Preferences
- in a field Additional Board Manager URLs add this link:
Tools -> Board: ... -> Boards Manager ...
- Search for
- Click Install button
2. Select ESP32 dev board:
Tools -> Board
- select ESP32 Dev Module under "ESP32 Arduino (Husarnet)" section
3. Install ArduinoJson library:
Tools -> Manage Libraries...
- search for
- select version
- click install button
4. Install arduinoWebSockets library (Husarnet fork):
- download https://github.com/husarnet/arduinoWebSockets as a ZIP file (this is Husarnet compatible fork of arduinoWebSockets by Links2004 (Markus) )
Sketch -> Include Library -> Add .ZIP Library ...choose arduinoWebSockets-master.zip file that you just downloaded and click open button
5. Install SparkFun_MPU-9250-DMP_Arduino_Library :
- download https://github.com/sparkfun/SparkFun_MPU-9250-DMP_Arduino_Library as a ZIP file
Sketch -> Include Library -> Add .ZIP Library ...choose SparkFun_MPU-9250-DMP_Arduino_Library-master.zip file that you just downloaded and click open button
- Open ESP32-MPU9250-web-view.ino project
- modify line 33 with your Husarnet
join code(get on https://app.husarnet.com)
- modify lines 12 - 21 to add your Wi-Fi network credentials
- upload project to your ESP32 board.
There are two options:
- log into your account at https://app.husarnet.com, find
box3desp32device that you just connected and click
web UIbutton. You can also click
box3desp32element to open "Element settings" and select
Make the Web UI publicif you want to have a publically available address. In such a scenerio Husarnet proxy servers are used to provide you a web UI. Works with any web browser: desktop and mobile.
- P2P option - add your laptop to the same Husarnet network as ESP32 board. In that scenerio no proxy servers are used and you connect to ESP32 with a very low latency directly with no port forwarding on your router. Currenly only Linux client is available, so open your Linux terminal and type:
$ curl https://install.husarnet.com/install.sh | sudo bashto install Husarnet.
$ husarnet join XXXXXXXXXXXXXXXXXXXXXXX mylaptopreplace XXX...X with your own
join code, and click enter.
At this stage your ESP32 and your laptop are in the same VLAN network. The best hostname support is in Mozilla Firefox web browser (other browsers also work, but you have to use IPv6 address of your device that you will find at https://app.husarnet.com) and type:
http://box3desp32:8000 You should see a web UI to controll your ESP32 now.
I hope you will like this project :)