EasyLoader (beta)

Current Product Don't Have Test Firmware

Note: pls, use PC chrome/edge browser, if can't connect, refresh the webpage.

1. Click connect button

2. After connected successfully, pick a firmware

3. Click the burn button

4. After burning successfully, Unplug the device and restart.





PbHub Expander unit is a single-bus board which is controlled using GROVE PortB connector (The black port on the M5Go Base). The expander unit contains 6 ports all in 1 unit. PortB can be used as GPIO and Analog in (the two data lines are connected to GPIO36 and GPIO26 on the ESP32 module).

Similar to the PaHub Unit, the PbHub provides solution for multiple devices control using a single port - PortB. With PbHub each of the IO can be configured as input and output, it has a built-in MEGA328 MCU with a simple driver firmware installed.

Product Features

  • Single-Bus GROVE PORTB Expander
  • Two Lego-compatible holes
  • 1-To-6


  • 1x PbHUB Unit
  • 1x Grove Cable


Resources Parameter
Communication protocol I2C: 0x61(can be modified by resistance A0, A1, A2)
Net weight 7g
Gross weight 19g
Product Size 48*24*12mm
Package Size 67*53*12mm

Notice: Please pay attention to the order of the channels while programing the PbHub

Note 1: The default range of the ADC input voltage of the built-in MCU is 0-5V, and the corresponding ADC resolution is 10bit (1024), so when using an analog signal input with an input range less than 5V, it will not reach the maximum The value is 1024.
Note 2: Not all Units with a black interface (PortB) support expansion through PbHUB. PbHUB can only be applied to basic single-bus communication, through the I2C protocol (built-in MEGA328) to achieve basic digital read and write, analog Read and write. But for units such as Weight (built-in HX711) that not only need to read analog, but also depend on the timing of the Unit, PbHUB cannot be expanded.


download EasyLoader

EasyLoader is a precise and fast program writer which has a built-in functionalities related to the 4-Relay unit. The Easyloader program can burn the firmware to the main controller board by simple easy to follow steps.

  1. After downloading the software, double-click to run the application, connect the M5 device to the computer through the data cable, select the port parameters, click "Burn" to start burning. (For M5StickC burning, please Set the baud rate to 750000 or 115200)
  1. Currently EasyLoader is only suitable for Windows operating system, Please install the corresponding driver according to the device type. Please click here to view the CP210X driver installation tutorial , M5StickC/V/T/ATOM series can be used without driver)


Mega328 ISP footprint definition


Change I2C Address

The Default I2C address of the unit is 0x61 (which can be changed by using solder resistors A0 ~ A2, the address range is 0x61 ~ 0x68).

A0 A1 A2 I2C Address
/ / / 0x61
Resistors / / 0x62
/ Resistors / 0x63
Resistors Resistors / 0x64
/ / Resistors 0x65
Resistors / Resistors 0x66
/ Resistors Resistors 0x67
Resistors Resistors Resistors 0x68



For the complete Arduino code please click here


Feature Introduction

Extended IO interface

  • pos digitalRead Read pin digital value

  • pos digitalWrite value Write a digital value to the pin

  • analogRead Read analog value

  • Set pos RGB number to Set the number of specified pins RGB

  • Set pos num RGB pos color Set the color of the specified serial number RGB

  • Set pos num RGB begin count color Set the RGB color within the specified range

  • Set pos RGB brightness Set the specified pin RGB brightness


For the Complete UIFlow example code please click here

  • protocol type - I2C
  • address - 0x61
  • Set oneLED Color : LED address(2bytes) + RGB value(3bytes)
  • Set moreLED Color : LED start address(2bytes) + LED end address(2bytes) + RGB value(3bytes)
state IO0 Digital Write IO1 Digital Write IO0 Analog Write IO1 Analog Write IO0 Digital Read IO1 Digital Read IO0 Analog Read reserve Set RGB LED Num Set oneLED Color* Set moreLED Color* Set Brightness
r/w w w w w r r r r w w w w
data length (Byte) 1 1 1 1 1 1 2 / 2 5 7 1
ch0 cmd 40 41 42 43 44 45 46 47 48 49 4A 4B
ch1 cmd 50 51 52 53 54 55 56 57 58 59 5A 5B
ch2 cmd 60 61 62 63 64 65 66 67 68 69 6A 6B
ch3 cmd 70 71 72 73 74 75 76 77 78 79 7A 7B
ch4 cmd 80 81 82 83 84 85 86 87 88 89 8A 8B
ch5 cmd A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB


Q1: How do I remove the speaker floor noise when the M5Core is on or running?

Execute the following statement in Setup() of the Arduino program

Q2: How does M5Core2 stack modules?

When M5Core2 is stacked with other M5 modules, you need to remove the battery base of Core2, which does not support module stacking.

Q3: A timeout error is displayed when uploading the program to the device

Reason and solution: The power supply current of the port is insufficient, which can cause the device to not enter the download mode normally. You can try to connect a capacitor (>0.1uF) between the RST pin and the GND pin, or when uploading the program, set the G0 Short-circuit to GND, so that G0 can be set to a low level state normally

Q4: How to solve the phenomenon of automatic signal triggering of M5Core button A

Add the header file #include <driver/adc.h> and the function adc_power_acquire(); in the Arduino program

Q5: M5 device battery life

The battery life of the controller is affected by various factors such as battery capacity, operating status, and load, so there is no fixed value. Reducing the load and adopting a sleep strategy can effectively increase the battery life.

Q6: Can multiple modules with batteries be stacked at the same time?

Support multiple stacks, the total capacity of the batteries in parallel increases, and the voltage remains unchanged. However, since the discharge of each battery is not balanced during use, there is a voltage difference between the batteries, which may cause the battery to charge backwards. .(will lose part of the battery capacity)

Q7: M5 master supports WiFi connection to 5G frequency band

ESP32 module currently does not support WiFi in 5G band, only 2.4G.

Q8: The RS485 device cannot communicate normally/data is garbled. Packet loss, etc.

Confirm whether the TX/RX pin on the TTL side of the pin is correct, try to add two 120Ω terminal resistors at the beginning and end of the device line to reduce signal reflection interference

Q9: The difference between different masters and camera products

Click the link below to view the product comparison table

Q10: M5 camera image blur, how to adjust the focal length

Rotate the lens to adjust the focal length within a certain range

Q11: The control RGB LED pin of FACE II BOTTOM conflicts with the I2S DOUT pin of CORE2


Q1: How to read the programmed firmware?

Use esptool to read the flash content of esp32 and export the bin file. Refer to the detailed operation

Q2: Several solutions for esp32 board download failure in Arduino IDE board management

Restart the Arduino IDE, the computer uses the mobile AP mobile network to download.

Method 3: Download the resource package provided by M5Stack for direct installation, and extract the contents to the board management path of Arduino, such as (C:\Users\Sean\AppData\Local\Arduino15\packages), https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/arduino/packages/m5stack_v2.0.0.zip
Q3: Arduino SPIFFS file upload operation

Refer to the Github link below, use arduino-esp32fs-plugin for file upload

Q4: When M5Burner burns firmware, an error pop-up window or exception occurs

Check if the COM of the corresponding device is selected and if the M5Burner is the latest version

Q5: Does the M5 master device support multi-language display (Chinese, English, Japanese, Russian, etc.)?

UIFlow users can switch the Label font to Unicode, Arduino users can use the Chinese font library provided in the M5GFX driver library

Q6: The program cannot load the SD card normally

Confirm whether the SD card format is FAT32, and no partitions exist.

Q7: How to use Bluetooth, HTTP, SD, WebServer, FreeRTOS and other features in Arduino IDE

You can refer to the following link for other ESP32 users to share the case program

Q8: How to download programs for STAMP C3U

STAMP C3U enters program download mode operation: 1. Long press the center button (G9) of STAMP C3U when the power is off. 2. Connect to the computer, after the port is successfully identified, program burning.

Q9: How STAMP C3U defines UART0 output mode

By default, USB CDC is not enabled, the serial port output started by C3U will be output through the default pins (G20, G21) of UART0. If you want to output through USB, please use the IDE to output Its USB CDC option is enabled. (Arduino users can enable it through Tools->USB CDC on Boot-Enabled. For IDF users, please refer to the ESP IDF official documentation.)

Q10: Unable to connect to UIFlow Desktop IDE

Refer to the UIFlow documentation of the corresponding device to check whether the device has entered the USB programming mode.

Q11: NBIoT devices cannot connect to the network normally

Make sure that the NBIoT used is not locked. Frequent device replacement or after activating the IoT card, using traffic in different places may cause the card to be locked. If the above situation occurs, please contact the IoT card supplier. If you are using the IoT card matching M5, please contact M5 after-sales through e-commerce or email. (provide the ICCID of the IoT card)


Q1: Consultation for after-sales problems of products

Describe the problems encountered in detail. Screenshots of the programs involved or files can be added as attachments and sent to M5Stack's official after-sales email

Q2: Code Resources, Cases, User Communication