CN103047997B - Based on the 3D acceleration of bluetooth and angular velocity Real-time Collection with send sensing module - Google Patents

Abstract

The sensing module based on bluetooth-based 3D acceleration and angular velocity real-time acquisition and transmission belongs to the field of sensing data transmission technology, and is characterized in that it is an integrated 3D acceleration sensor, gyroscope, bluetooth module, Atmega328P processor, serial port communication chip, charging control When the serial port USB is connected to the Bluetooth module, it is in the state where the Atmega328P processor modifies the parameters of the Bluetooth module; when the serial port USB is connected to the chipset MCU of the Atmega328P processor, it is in the state of system modification , externally input modification codes to the Atmega328P processor through the serial port USB; when the Bluetooth module is connected to the Atmega328P processor, it is in a working state, and the Atmega328P microprocessor sends out sensing data through the Bluetooth module. The integration of the sensor of the present invention improves the practicability.

Description

Real-time acquisition and transmission sensor module of 3D acceleration and angular velocity based on bluetooth

technical field

The invention belongs to the field of electronic information. It is a wireless sensor module based on Bluetooth technology that can collect and transmit 3D acceleration and angular velocity data in real time.

Background technique

The existing 3D acceleration and angular velocity sensors and gyroscopes can collect real-time and accurate 3D acceleration and angular velocity data during the movement of objects. Although these sensor modules are very small, due to their complex pins and wiring, it is difficult to integrate and reduce the practicality. In addition, mobile terminal devices such as smart phones and notebooks now integrate Bluetooth communication modules. The market needs a sensor module that can collect 3D acceleration and angular velocity data of object activities and send the collected data through Bluetooth.

In view of the above problems, the present invention provides a wireless sensor module based on bluetooth technology that can collect and transmit 3D acceleration and angular velocity data in real time; at the same time, developers can use the Arduino development environment to write programs for this module and set the sampling rate of the sensor , Bluetooth data transmission rate, and download the program to the module to meet the needs of different applications.

Contents of the invention

For the size and pin characteristics of 3D acceleration and angular velocity sensor, bluetooth module and Atmega328P microprocessor, the present invention has designed the arrangement and wiring method of core chipset; Design corresponding PCB circuit board to integrate 3D acceleration sensor, gyroscope, bluetooth module , Atmega328P processor, FT232RQ serial communication chip, LP2992 lithium battery control chip and MAX1555 charge controller. The invention can not only collect the 3D acceleration and angular velocity data of object activities in real time, but also send the data through bluetooth. At the same time, developers can use the Arduino development environment to write programs for this module, set the sampling frequency of the sensor, the rate of Bluetooth data transmission, and download the program to this module through a USB cable to meet the needs of different applications. The module design layout is shown in Figure 1.

The present invention is a PCB circuit board integrated with ADXL3453D acceleration sensor, ITG-3205 gyroscope, BC417143 Bluetooth module, Atmega328P processor, FT232RQ serial port communication chip, LP2992 lithium battery charging control chip and MAX1555 charger, wherein:

The ADXL3453D acceleration sensor is connected to the acceleration signal input end of the Atmega328P processor through pins SDA and SCL,

The ITG-3205 gyroscope is connected to the angular velocity signal input terminal of the Atmega328P processor through pins SDA and SCL,

BC417143 Bluetooth module, FT232RQ serial port chip is connected to the Atmega328P processor through the jumper pin module, wherein:

The jumper pin module is provided with: the TX_BT pin represented by the mark "1", the RX_BT pin represented by the mark "2", the TX_MCU pin represented by the mark "3", and the mark "4" The RX_MCU pin, the TX_USB pin indicated by the identification "5", and the RX_USB pin indicated by the identification "6", where:

When the pin TX_MCU is connected to the pin TX_USB, and the pin RX_MCU is connected to the pin RX_USB, the sensor module is in the system programming state, and the program code is programmed to the Atmega328P processor through the serial port USB of the FT232QR serial port communication chip , or monitor the running program code in the Atmega328P processor,

When the pin TX_MCU is connected with the pin TX_BT, and when the pin RX_MCU is connected with the pin RX_BT, the sensing module is in normal working condition, and the Atmega328P processor collects from the ADXL3453D acceleration sensor and the ITG-3205 gyroscope The data is transmitted to the BC417143 Bluetooth module, and the sensing data obtained by the wireless transmission of the BC417143 Bluetooth module,

When the pin TX_BT is connected with the pin RX_USB, and when the pin RX_BT is connected with the pin TX_USB, the sensor module is in the bluetooth parameter modification state, and the Atmega328P processor checks or modifies the bluetooth through the serial port USB of the FT232RQ serial port communication chip working parameters,

The Atmega328P processor is connected with the external 3V～5V lithium battery through the serial port USB to supply power or charge, and the power supply process is controlled by the MAX1555 charger and the LQ2992 lithium battery charging control chip connected in series during power supply, wherein, the The serial port USB is provided by the FT232RQ serial port communication chip.

The present invention has the advantages of: integrating sensors, processors, power supplies, serial communication, wireless communication and other modules with different functions at one time, with high integration, small size, light weight and low power consumption, so it is very convenient to use; at the same time , The open circuit design makes on-chip programming and code modification very convenient, which not only greatly enhances the usability of the circuit, but also makes the system more powerful.

Description of drawings

Fig. 1 is each module design layout drawing of the present invention.

Fig. 2 schematic diagram of jumper pin module in the present invention.

detailed description

The present invention adopts following technical scheme:

As shown in Figure 1, the present invention adopts the ADXL345 acceleration sensor that AnalogDevices company produces to collect the 3D acceleration of object activity, and this sensor measurement range is ± 6g, and sensing accuracy is 4mg/LSB; 3D angular velocity, the sensing accuracy of the sensor is 14.375LSB/(°/s), and the range is ±2000°/s. These two types of sensors have the characteristics of high measurement accuracy, small size, and low power consumption; Atmega328P of Atmel Company is used As the central processing unit MCU, the main frequency of the chip crystal array is 16MHz; select the BC417143 Bluetooth module of CSR Company, this module works in Class2 mode, the maximum transmission distance is 10m, and the data transmission rate can be 1200~1382400Bits/S; FT232RQ serial The communication chip provides USB interface and serial communication support for this module; the LP2992 lithium battery control chip and MAX1555 charging controller are used, so that the module can be powered not only by 3-5V lithium battery, but also by USB interface circuit, and can be powered by USB The interface charges the lithium battery.

As shown in Figure 1, the 3D acceleration sensor (pins SDA and SCL) is connected to the Atmega328P, and the gyroscope (pins SDA and SCL) is connected to the Atmega328P, thereby realizing the real-time acquisition of 3D acceleration and angular velocity data by the Atmega328P processor. The Atmega328P processor is connected with the Bluetooth module and the FT232 serial port chip through jumper pins. By setting the jumper pins, the module of the present invention is respectively in the bluetooth modification state, the system programming state and the normal working state.

As shown in Figure 2, the jumper pin module has a total of 6 pins. Pins 1 and 2 are connected to the TX and RX pins of the Bluetooth module BT, pins 3 and 4 are connected to the TX and RX pins of the MCU chipset, pins 5 and 6 are connected to the serial port USB TX and RX pins. When pin 3 is connected to pin 5, and pin 4 is connected to pin 6, the microcontroller chipset MCU is connected to the serial port USB. At this time, the program in the microcontroller can be programmed through the serial port, or through the serial port. Monitor the operation of the program in the microcontroller. When pin 3 is connected to pin 1, and pin 4 is connected to pin 2, the microcontroller chipset MCU is connected to the Bluetooth module BT. At this time, the microcontroller can transmit the real-time data collected from the sensor to the Bluetooth module. , the data is transmitted wirelessly by the Bluetooth module. When pin 1 is connected to pin 6, and pin 2 is connected to pin 5, the Bluetooth module BT is connected to the serial port USB. At this time, the command line operation of Bluetooth can be performed through the serial port to detect the Bluetooth module. Working status or change the working parameters such as the transmission baud rate of the Bluetooth module.

The present invention will be further described below in combination with specific embodiments.

The present invention has three states in total, namely bluetooth modification state, system programming state and normal working state, and the connection methods of the jumper pins are different in different states.

When the present invention is in the bluetooth modification state, the serial port USB is connected with the bluetooth BT, and at this time, the bluetooth parameters can be modified and checked through the serial port. The specific operation method is: connect the serial port USB to the computer with a data cable, and write the command line into the serial port through the computer, so as to view or change the Bluetooth parameters.

When the present invention is in the system programming state, the serial port USB is connected with the chip set MCU of the single-chip microcomputer. At this time, program codes can be written to the single-chip microcomputer through the serial port, and the running program codes in the single-chip microcomputer can also be monitored. The specific operation method is: connect the serial port USB to the computer with the data cable, burn the compiled program code into the single-chip microcomputer through the development kit installed on the computer, or monitor the operation of the program in the single-chip microcomputer through the monitoring window that comes with the development kit state.

When the present invention is in a normal state, the bluetooth BT is connected with the chip set MCU of the single-chip microcomputer. At this time, the single-chip microcomputer can transmit the data collected from the sensor to the bluetooth module, and the bluetooth can transmit the data packets wirelessly. The specific working method is as follows: the 3D acceleration sensor and the gyroscope collect the motion data of the object, and the collected data is handed over to the single-chip microcomputer for processing and packaging, and the single-chip microcomputer sends the processed data packet to the Bluetooth module in the form of a string The Bluetooth module sends out the data packet according to the corresponding settings, and the receiving device can obtain the relevant data through software analysis after receiving the data packet. Wherein, the receiving device is a smart device installed with a Bluetooth receiving module, which may be a mobile phone, a computer, and the like.

Claims (1)

1. The sensing module based on Bluetooth-based 3D acceleration and angular velocity real-time acquisition and transmission is characterized in that it is an integrated ADXL3453D acceleration sensor, ITG-3205 gyroscope, BC417143 Bluetooth module, Atmega328P processor, FT232RQ serial communication chip, LP2992 lithium The battery charging control chip and the PCB circuit board of the MAX1555 charger, of which: The ADXL3453D acceleration sensor is connected to the acceleration signal input end of the Atmega328P processor through pins SDA and SCL, The ITG-3205 gyroscope is connected to the angular velocity signal input terminal of the Atmega328P processor through pins SDA and SCL, BC417143 Bluetooth module, FT232RQ serial port communication chip is connected to the Atmega328P processor through the jumper pin module, wherein: The jumper pin module is provided with: the TX_BT pin represented by the mark "1", the RX_BT pin represented by the mark "2", the TX_MCU pin represented by the mark "3", and the mark "4" The RX_MCU pin, the TX_USB pin indicated by the identification "5", and the RX_USB pin indicated by the identification "6", where: When the pin TX_MCU is connected to the pin TX_USB, and the pin RX_MCU is connected to the pin RX_USB, the sensor module is in the system programming state, and the program code is programmed to the Atmega328P processor through the serial port USB of the FT232QR serial port communication chip , or monitor the running program code in the Atmega328P processor, When the pin TX_MCU is connected with the pin TX_BT, and when the pin RX_MCU is connected with the pin RX_BT, the sensing module is in a normal working state, and the Atmega328P processor collects the data from the ADXL3453D acceleration sensor and the ITG3205 gyroscope passing to the BC417143 Bluetooth module, the sensing data obtained by the wireless transmission of the BC417143 Bluetooth module, When the pin TX_BT is connected with the pin RX_USB, and when the pin RX_BT is connected with the pin TX_USB, the sensor module is in the bluetooth parameter modification state, and the Atmega328P processor checks or modifies the bluetooth through the serial port USB of the FT232RQ serial port communication chip working parameters, The Atmega328P processor is connected with the external 3V～5V lithium battery through the serial port USB to supply power or charge, and the power supply process is controlled by the MAX1555 charger and the LQ2992 lithium battery charging control chip connected in series during power supply, wherein, the The serial USB is provided by the FT232RQ serial communication chip.