Additional instructions:
1. This module is a serial TTL interface, not equal to the RS232 interface. If you want to return data to the computer serial port assistant, you must convert the TTL to RS232. At present, many customers get the module and connect directly to the computer through the RS232 serial cable. This is a wrong approach.
2. If you are not familiar with the hardware, it is recommended to connect the module to the computer with TTL to RS232 module, receive data with the serial port assistant, first understand the data characteristics of the module, and then connect to your own control system.
3. Provide the reference program for this module for secondary development. The module circuit and its running program code are not provided. Do not mind if the customer does not shoot.
First, the characterization
project
Parameter Description
Product number
HH_06.03
Module function
Detecting sound decibels
Communication form
Active type
Operating Voltage
DC 5.0V
Working current
29mA/5.0V
way of communication
Serial TTL/5V
Measuring range
40-130dB
Frequency Range
40Hz-8kHz
Weighting method
A weighting
Resolution
0.1dB
Frame interval
About 500ms
PCB size
47.12*28.00mm
total measurement
54.46*28.00*9.70(H)mm
Second, the module interface description
1. VCC: External 5VDC power supply, which must be powered by 5V, and the higher the accuracy, the better.
2, GND: external GND
3, TX: serial TTL sender
4, RX: serial TTL receiver
Third, the serial parameters and description
3.1 Serial parameters
Serial baud rate: 115200, check digit: no, stop bit: 1 bit
3.2 Serial Packet Protocol
Packet format: start character + command + data + check value. The total length of a frame of data packets is 6 bytes.
1) Start character: BBAA, 2 bytes in length (0xBB, 0xAA),
2) Command: 1 byte length,
00, return module software version number command,
01, return the decibel data command,
3) Data: 2 bytes in length, software version information and decibel value data are stored in these data segments.
4) Check value: 1 byte length, arithmetic and check of start character, command and data, excluding overflow value exceeding 256.
Fourth, the communication command description
4.1 Module Software Version Number Command
Such as: BB AA 00 02 00 67
Start character: BB AA, indicating the beginning of a frame,
The command: 00 indicates that this frame is the frame that returns the software version number of the module.
Data: 02 00, indicating that the module software version number is 2.0,
Check value: 67, which is the arithmetic and check value of BB, AA, 00, 02, 00.
Note: This frame is the first packet returned after the module is powered on, and it returns only once after power-on.
4.2 decibel data command
Such as: BB AA 01 7F 02 E7
Start character: BB AA, indicating the beginning of a frame,
Command: 01, indicating that this frame is the return decibel value data,
Data: 7F 02, indicating that the detected decibel value is 63.9 dB. The low byte is first, the high byte is after, and the unit is 0.1 dB,
Check value: E7, the arithmetic and check values ??of BB, AA, 01, 7F, 02.
Note: This frame returns this frame every 500ms after the module powers up and returns the software version number command frame.