IoT Node


You'll need to install a library to make Arduino IDE support the module. This library includes drivers for the MMA8491Q and sample code for you to jumpstart your project.


For ESP32 based systems, we're currently supporting Arduino core. Please make sure you've installed the following:

  • Arduino IDE.

  • ESP32 Hardware libraries for the Arduino IDE.

  • Python for the compilation of Arduino projects.

  • Drivers for your host device, e.g., USB Virtual Serial Port driver.


Please download the library archive from

Then, copy its contents to your Arduino Libraries folder.

You can find the Arduino Libraries folder inside your Arduino sketch directory. It is generally located inside the My Documents folder.


The library comes with included samples. There is no need to download additional files for the examples.

Source Code

The hardware, its drivers and the sample code are open source. You can use them under the terms of the MIT license. Please feel free to customize and prototype them for your projects.

Arduino Library

Turta_AccelTilt_Module library is responsible for reading the accelerometer and tilt data.

To use the library on Arduino IDE, add the following #include statement to the top of your sketch.

#include <Turta_AccelTilt_Module.h>

Then, create an instance of the Turta_AccelTilt_Module class.

Turta_AccelTilt_Module accel

Now you're ready to access the library by calling the accel instance.


To initialize the module, call the begin method.


This method configures the I2C bus and GPIO pins to read sensor data.

Basic Members

Read X-Axis

Returns the G value of the X axis.

double readXAxis()
  • Parameters

    • None.

  • Returns

    • Double: G Value of the X axis.

Read Y-Axis

Returns the G value of the Y axis.

double readYAxis()
  • Parameters

    • None.

  • Returns

    • Double: G Value of the Y axis.

Read Z-Axis

Returns the G value of the Z axis.

double readZAxis()
  • Parameters

    • None.

  • Returns

    • Double: G Value of the Z axis.

Read XYZ Axis

Returns the values of all axes in a single shot.

void readXYZAxis(double x, double y, double z)
  • Parameters

    • Double: x out

    • Double: y out

    • Double: z out

  • Returns

    • None

Read Tilt State

Returns the tilt state of all axes.

void readTiltState(bool xTilt, bool yTilt, bool zTilt)
  • Parameters

    • Bool: xTilt out

    • Bool: yTilt out

    • Bool: zTilt out

  • Returns

    • None


You can open the example from Arduino IDE > File > Examples > Examples from Custom Libraries > Turta Accel & Tilt Module. There are two examples of this sensor.

pageAccel SamplepageTilt Sample


If you're experiencing difficulties while working with your device, please try the following steps.

Problem: When using the single shot reading function, Y-axis returns 0 G. Cause: There is a software communication error on the I2C bus. Solution: It's a known issue, and we're working on to fix this bug. Until then, please use the single reading functions. It's not a malfunction.

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