MU Camera

Function introduction

Petoi Intelligent Vision Sensor can recognize many objects with a deep-learning algorithm. For example, it can detect color blocks, balls, the human body, and cards. Its detection result can be transmitted through the UART or I2C interface. MU is compact, has low power consumption, processes all algorithms locally, and can be widely used in intelligent toys, AI+STEAM lessons, creators, and other products or fields.

Hardware setup

After uploading the firmware, switch the dial switches on the MU Vision Sensor and connect to the mainboard with wire as shown in the following picture:



Note: The position of the left and right switches (left: down and up; right: down and down) must be dialed to the position shown in the figure.

Fix the end connected to the camera to the robot's head (included in Bittle's / Bittle X's mouth).

Software setup


  1. First, download and install the MU camera library into your Arduino IDE.

2. Use the latest OpenCat/OpenCatEsp32 code to finish the setup.

If you have already uploaded the latest OpenCat code to make Bittle / Bittle X walk, you only need to uncomment #define CAMERA at the beginning of OpenCat.ino, then upload the code.

If unsure, you need to finish the upload process for the standard mode (Step 1 to Step 10) to ensure everything is configured correctly, then upload the code in the camera mode.


If the camera code is uploaded correctly, Bittle / Bittle X maintains the rest position. Success messages are printed on the serial monitor of Arduino IDE. When the MU Vision Sensor recognizes a target, the two LEDs will turn blue, and Bittle's / Bittle X's head can follow the target and swing left and right. The demo code will auto-switch the target between a yellow tennis ball and a human body if it fails to find any object.


The demo video is as follows:


If the MU Vision Sensor cannot identify the target object, please press the reset button on the camera and then the reset button on the main board.

While the MU Vision Sensor connects with BiBoard if the white LED on the back of the MU Vision Sensor isn't lit up.

Please plug the battery into the BiBoard and long-press the button on the battery to power the BiBoard. Then, click the camera's reset button and the main board's reset button in order.

For more details, please refer to the Technical Support Document.

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