TuyaOS Embedded Bluetooth Low Energy MPU6050 Driver

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Overview

This demo shows you how to use the MPU6050 driver component and view the data acquired by this sensor via a serial communication tool. This demo application is developed based on Tuya's low power Bluetooth module and the Bluetooth Low energy SDK. You can create a prototype of a smart product on the Tuya IoT Development Platform and control it by using the Smart Life app.

Get started

Set up IDE

• Install the integrated development environment (IDE) as per your chip platform.
• To download the SDK, you need to create a product on the Tuya IoT Development Platform. Then, go to the Hardware Development step, select a connection method and a network module, and then download the SDK in the Download Documents area.

Compilation and flashing

• Edit code

  1. In tuya_ble_sdk_demo.h, populate the PID, MAC address, UUID, and authKey with the value you obtained from the Tuya IoT Development Platform.

     #define TY_DEVICE_NAME        "demo"
     #define TY_DEVICE_PID         "xxxxxxxx" /* PID */
     #define TY_DEVICE_MAC         "xxxxxxxx" /* mac */
     #define TY_DEVICE_DID         "xxxxxxxx" /* uuid */
     #define TY_DEVICE_AUTH_KEY    "xxxxxxxx" /* authkey */

     Replace xxxxxxxx with the value you obtained.

  2. In tuya_ble_sdk_demo.c, change the values of use_ext_license_key and device_id_len to 1 and 16 respectively to make the license effective.

     static tuya_ble_device_param_t tuya_ble_device_param = {
           .use_ext_license_key = 1,	// 1-info in tuya_ble_sdk_demo.h, 0-auth info
           .device_id_len       = 16,	// DEVICE_ID_LEN,
           .p_type              = TUYA_BLE_PRODUCT_ID_TYPE_PID,
           .product_id_len      = 8,
           .adv_local_name_len  = 4,
           .firmware_version    = TY_DEVICE_FVER_NUM,
           .hardware_version    = TY_DEVICE_HVER_NUM,
     };

• Compile code

  Compile the edited code, download the code to the hardware, and run it. You may need to download the stack and bootloader depending on your chip models. Check the logs and use the third-party Bluetooth debugging app (such as LightBlue for iOS) to verify the Bluetooth broadcast.

File introduction

├── include
|    ├── common
|    |    └── tuya_common.h                /* Common types and macros */
|    ├── driver
|    |    └── tuya_mpu6050.h               /* MPU6050 driver */
|    ├── platform
|    |    └── tuya_gpio.h                  /* GPIO driver */
|    ├── sdk
|    |    ├── tuya_ble_bulk_data_demo.h    /* Bulk data transmission */
|    |    ├── tuya_ble_product_test_demo.h /* Routine for end product testing */
|    |    └── tuya_ble_sdk_test.h          /* UART commands for testing */
|    ├── tuya_ble_sdk_demo.h               /* Entry to the main application. SDK initialization. */
|    └── tuya_mpu_daq.h                    /* MPU6050 acquires data */
└── src
     ├── driver
     |    └── tuya_mpu6050.c               /* MPU6050 driver */
     ├── platform
     |    └── tuya_gpio_nRF52832.c         /* nRF52832 GPIO driver */
     ├── sdk
     |    ├── tuya_ble_bulk_data_demo.c    /* Bulk data transmission */
     |    ├── tuya_ble_product_test_demo.c /* Routine for end product testing */
     |    └── tuya_ble_sdk_test.c          /* Program for testing SDK */
     ├── tuya_ble_sdk_demo.c               /* Entry to the main application. SDK initialization. */
     └── tuya_mpu_daq.c                    /* MPU6050 acquires data */

Entry to application

Entry file: tuya_ble_sdk_demo.c

• tuya_ble_sdk_demo_init() is run to initialize the SDK. This function is run only once.
• tuya_mpu_daq_init() is run to initialize the data acquisition application.

Data point (DP)

Function	tuya_ble_dp_data_send
Function prototype	tuya_ble_status_t tuya_ble_dp_data_send( uint32_t sn, tuya_ble_dp_data_send_type_t type, tuya_ble_dp_data_send_mode_t mode, tuya_ble_dp_data_send_ack_t ack, uint8_t *p_dp_data, uint32_t dp_data_len ) ;
Feature overview	Send data point (DP) data to the cloud.
Parameters	sn[in]: the serial number. type[in]: the type of data sending, which can be a proactive notification or a follow-up response. mode[in]: the delivery mode. ack[in]: whether an ACK message is required. p_dp_data [in]: the DP data. dp_data_len[in]: the length of data, no more than TUYA_BLE_SEND_MAX_DATA_LEN-7. TUYA_BLE_SEND_MAX_DATA_LEN is configurable.
Return value	TUYA_BLE_SUCCESS: sent successfully. TUYA_BLE_ERR_INVALID_PARAM: invalid parameter. TUYA_BLE_ERR_INVALID_STATE: failed to send data due to the current Bluetooth connection, such as Bluetooth disconnected. TUYA_BLE_ERR_NO_MEM: failed to request memory allocation. TUYA_BLE_ERR_INVALID_LENGTH: data length error. TUYA_BLE_ERR_NO_EVENT: other errors.
Notes	The application calls this function to send DP data to the mobile app.

p_dp_data parameter description:

The Tuya IoT Development Platform manages data through DPs. Each product feature defined on the platform is described as a DP. The DP data consists of four parts. For more information, see Custom Functions.

• Dp_id: The 1-byte parameter indicates the ID of a DP defined on the Tuya IoT Development Platform.

• Dp_type: The 1-byte parameter indicates the data type.

  • #define DT_RAW 0: raw type.
  • #define DT_BOOL 1: Boolean type.
  • #define DT_VALUE 2: value type. The value range is specified when a DP of value type is created on the Tuya IoT Development Platform.
  • #define DT_STRING 3: string type.
  • #define DT_ENUM 4: enum type.
  • #define DT_BITMAP 5: bitmap type.

• Dp_len: The 2-byte parameter indicates the length of a DP. The maximum length of a DP is specified when you define a DP on the Tuya IoT Development Platform.

  • If Dp_type is 1, Dp_len must be 1.
  • If Dp_type is 2, Dp_len can be 1, 2, or 4.
  • If Dp_type is 4, Dp_len must be 1.
  • If Dp_type is 5, Dp_len can be 1, 2, and 4.
  • If Dp_type is 0 or 3, Dp_len can be customized but must not exceed the maximum length defined on the Tuya IoT Development Platform.

• Dp_data: the DP data with the length of dp_len.

The data that the parameter Dp_data points to must be packaged in the following format for reporting.

DP 1 data				—	DP n data
1	2	3 to 4	5 and greater	—	n	n+1	n+2 to n+3	n+4 and greater
Dp_id	Dp_type	Dp_len	Dp_data	—	Dp_id	Dp_type	Dp_len	Dp_data

You can send the data of multiple DPs at a time. Make sure the total length does not exceed TUYA_BLE_SEND_MAX_DATA_LEN-7. The parameter TUYA_BLE_SEND_MAX_DATA_LEN is configurable.

Pin configuration

Peripherals	I/O
Digital I/O power supply of MPU6050 (VLOGIC)	IO16_D
Interrupt output of MPU6050 (INT)	IO2_A
SCL of the MPU6050's I2C	IO14_D
SDA of the MPU6050's I2C	I/O11
TXD/RXD for UART communication	IO18_D/IO20_D

Reference

• Bluetooth Low Energy SDK Guide
• Tuya Project Hub

Technical support

You can get support from Tuya with the following methods:

• Tuya Developer Platform
• Help Center
• Service & Support