Introduction to application design scheme of intelligent garbage can voice chip, wt588f02b-8s

WT588F02B The application design scheme of voice chip in intelligent garbage can

Intelligence has become a trend of the times , Nowadays, people's demand makes intelligent home an indispensable part . And garbage cans are indispensable furniture in people's daily life , There are even garbage collection stations on the streets . But the function of the existing garbage can is too single , It has been unable to meet people's daily requirements for smart furniture .

About the traditional flip trash can , Most people will open the lid of the garbage can with disgust , After all, it's garbage , Bacteria will inevitably grow , Nowadays, garbage classification is advocated everywhere , Standing in front of the garbage bin , Are you confused about how to classify your investment .WT588F02B The application of voice chip gives the garbage can a warm “ Voice cues ”.

WT588F02B Voice chip is a very excellent voice chip , This series of chips integrates voice broadcasting 、 Nixie tube display driver and other functions , And rich expansion resources , A single chip can complete voice interaction 、 Display drive 、MCU function .WT588F Series chips have 3 Kind of package ：SOP8、SOP16、SSOP24.

WT588F02B Design example of intelligent trash can

1. Program Overview

The design meets the following functional requirements ：

1. When someone is near the trash can , The trash can will automatically flip over , And send out the prompt sound of garbage classification ;

2. When away from the trash can 5 Automatically close the cover after seconds , Make a voice of thanks ;

3. Key function ： Select normally open mode or inductive mode ;

4. Standard voice playback function .

2. Application framework diagram

The system structure diagram is shown in the figure below .

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3. Serial communication description ：

3.1. Protocol command format :

WT588F02B-8S Built in standard UART Asynchronous serial interface , Belong to 3.3V TTL Level interface . The communication data format is ： Start bit ：1 position ; Data bits ：8 position ; Odd and even bits ： nothing ; Stop bit ：1 position . Use the computer serial port debugging assistant , You need to set the parameters of the serial port correctly , The setting is as shown in the figure ：

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Voice serial port instruction ： Only the instruction length and check are correct , Will judge the order ; When the command does not exist , no return value , Too many parameters and no return value , Parameter error returns 01

Clock class serial port instructions ： According to its table description, the return is consistent , Only the length sum check is correct , Will judge the order ; The order does not exist , no return value , Too many parameters and no return value , Parameter error returns 01;

Be careful ：“ length ” It means the length （1 byte ）+ Command code （ Several bytes ）+ Parameters （ Several bytes ）+ The checksum （1 Bytes ） The length of （ Number of bytes ）;

“ Add up and check ” It means the length + Command code + The low byte of the cumulative sum of parameters ;

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3.1.1. Pin instructions ：

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3.2. Voice play command ：

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Command format

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3.2.1. Play the voice of the corresponding address （A0）

Be careful ：1. It can play 32,767 Paragraph voice ;

3.2.2. Volume adjustment command （AE）

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Be careful ：1. Volume adjustment has 32 level (00～1F), among 00 Minimum volume ,1F The volume is maximum ;

2. At the end of voice playback 、 Send this command to adjust the volume during playback or in standby mode ;

3.2.3. Cycle through the current voice （AF）

Be careful ：1. Address ---- Express 01 perhaps 00;01： Single tune circulation ;00: Cancel single loop ;

2. Execute this command to cycle the current segment of voice , Can be sent during voice playback . During the execution of circular instructions , Can be AB command 、 Normal address instruction 、B0 Combined instruction interrupt , Failure , You need to send the play command first , Then issue the circular play instruction ;

3.2.4. Stop the current voice playback （AB）

3.2.5. Code play （B0）

Be careful ：1.FF/NN---- Fixed code , reserve , It doesn't work for the time being , It can be used directly 00 00 replace ( It's indispensable );

2. Example ： If we want the chips to play in turn 01/01/02 Voice content of the address , That is, even code instruction playback ;

Instruction is ：00 7E 0B B0 00 00 00 01 00 01 00 02 BF EF.

3.3. PWM Output

Returns the format

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Be careful ：

（1） The command represents setting PWM Pulse width ,XX The range is 00~B4, Express 0~180 Degrees of rotation ;

（2） The function of this command is to set the rotation angle of the steering gear

4. Hardware design overview

This scheme is optional MUC control , And receive infrared ranging signal , Pass the standard after treatment UART Serial port communicates with voice chip , Realize cover opening setting and voice broadcasting function .

4.1. Introduction to voice chip

WT588F02A-16S It is the latest product developed by Shenzhen Weichuang Zhiyin Electronics Co., Ltd 16 position DSP Voice chip 、 Internal oscillation 32Mhz,16 Bit PWM decode . Powerful functions make WT588F02A-16S Become a leader in the voice chip industry . at present WT588F02A-16S, Maximum hanging capacity 128Mbit Of flash, The chip has built-in hardware SPI、UART、IIC、 Comparator and other resources , It can customize various personalized function products for customers .

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4.1.1. Basic functions and characteristics of the chip

1.16 position DSP Voice chip 、32Mhz Internal oscillation ;

2. Working voltage 2.0~5.5V; Recommended voltage ：2.2~4.0V（ Due to the use of serial port TTL Level communication ）

3.16bit Of PWM Output , Can drive directly 8R 0.5W horn ;

4. Support 6K~32Khz Of WAV file ;

5. Customers can download the test board to replace the internal voice content of the chip online ;

6. With voice prompt function ;

7. Inside the chip is 183K byte Storage space （ Excluding the main control program ）.

8. The chip master program and the built-in stored data can be erased and then burned .

4.2. Red sensor interface

The human body has a constant body temperature , Generally in 37 Centigrade , So it emits a specific wavelength （10um Left and right infrared ）, Passive infrared probe is used to detect the emission of human body 10um The left and right infrared two work . The infrared emitted by the human body is enhanced by the Fresnel filter and gathered on the infrared sensing source , Pyroelectric elements are usually used as infrared induction sources , This element will lose its charge balance when it receives the infrared radiation from the human body and the temperature changes , Release charge outward , The output signal can be received by the main control chip , And communicate with voice chip , Control the state of the cover .

4.3. SG90 The steering gear

The control of the steering gear generally needs a 20ms Time base pulse , The high level of the pulse is generally 0.5ms~2.5ms Angle control pulse in range . When the infrared sensing module senses that an object is approaching , Controlled by voice chip PWM The pulse width output controls the steering gear to turn and jack up the garbage can cover .

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The following figure shows the pulse width corresponding to different rotation angles .

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4.4. General schematic diagram

About us

As a high-tech enterprise focusing on voice technology research , Always adhere to “ Good service engineers ” Target , Take the standardization of voice interaction devices in the industry as the direction , Committed to making complexity simple , Provide fast voice 、 Intelligent Internet of things application solutions .WT588F series 、WT2003H series 、WTN6 Application design scheme of series voice chip , On the smart alarm clock 、 Smart water cup 、 There are mature application cases in the field of consumer electronics such as atomizer . The application of consumer electronic products is an important development field of the company , future , Weichuang Zhiyin will launch standardized voice chips in more industries , Further enhance the design experience of Engineers , Enabling standardization in the consumer electronics industry .