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IR human body infrared thermometer MLX90615 non-contact thermometer module serial output data directly

Note: the module I/O is a TTL level. It can be connected directly with the serial port of the single chip microcomputer. It can be connected directly with the PL2303, CH340, FT232 and other chips, but it can not be directly connected with the serial port of the computer.


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Infrared IR non-contact temperature measurement module MLX90615 module serial output data directly, small size, default no welding pin.

Temperature measurement distance 1-2CM

The computer needs USB to turn TTL serial module:


1. provide computer software to view the data

2. provide Arduino programs

3. provide 51 single chip computer program

4. provide STM32 programs

Power supply: 3-5v

Current: 5mA

Baud rate: 9600 or 115200

Size: 14mm*16mm*5mm (long * width * height)


communication protocol

The serial port sends command bytes:

(1) serial communication parameters (default baud rate 115200 BPs, can be set by software)

Baud rate: 9600 BPS check bit: N data bits: 8 stop bits: 1

Baud rate: 115200 BPS check bit: N data bits: 8 stop bits: 1

(2) module input command, sent from external controller to GY-MCU90615 module (sixteen binary).

1. Frame head: 0xa5

Instruction format: frame header + instruction + check sum (8bit), for example, automatically read temperature instruction =0xA5+0x45+0xEA.

2. Command order:

Continuous output instructions:

0xA5+0x45+0xEA---------------- temperature data (module return data type is 0x45)

Query output instructions:

0xA5+0x15+0xBA - -- temperature data (module return data type is 0x45)

Configuration instruction: (after power off is restarted)

Baud rate configuration:

0xA5+0xAE+0x53 ---------------9600

0xA5+0xAF+0x54 ---------------115200 (default)

Whether the power supply automatically sends the temperature data configuration:

0xA5+0x51+0xF6--------------- automatically output temperature data after power on.

0xA5+0x52+0xF7--------------- does not automatically output temperature data after power on (default).

communication protocol

Serial port reception:

(1) serial communication parameters (default baud rate 115200 BPs, can be set by software)

Baud rate: 9600 BPS check bit: N data bits: 8 stop bits: 1

Baud rate: 115200 BPS check bit: N data bits: 8 stop bits: 1

(2) module output format, each frame contains 9 bytes (sixteen hexadecimal):

.Byte0: 0x5A frame header

.Byte1: 0x5A frame header

(3).Byte2: 0X45 data type of this frame (0X45: temperature data)

(4) data volume of.Byte3: 0x04 (the following 4 data, 2 groups as an example)

5.Byte4: 0x00~0xFF data 1 high 8 bits

.Byte5: 0x00~0xFF data 1 low 8 bits

.Byte6: 0x00~0xFF data 2 high 8 bits

.Byte7: 0x00~0xFF data 2 low 8 bits

Check the.Byte8: 0x00~0xFF checksum (preceding data accumulation and leaving only 8 bits).

(3), data calculation method

Temperature calculation method:

Temperature = high 8 bit <<8| low 8 bits (result from actual angle multiplied by 100).

Example: send instruction: A5 45 EA, receive a frame of data:

<5A- 5A- 45- 04- 0C- 78- 0D- 19- A7 >

Represents TO (signed 16bit, indicating target temperature): TO=0x0C78/100=31.92 C.

TA (signed 16bit, indicating ambient temperature): TO=0x0D19/100=33.53 C

Usage method

The module will output data for the serial port. After the user connects with the serial port, the output instruction is sent, such as 0xA5+0x45+0xEA to the module. The module will output the temperature data continuously. If the module is wanted to send 0xA5+0x15+0xBA to the module through the query output, the module will return a temperature data once, and the query frequency should be lower than 10Hz, such as If you need to be above 10Hz, please use continuous output mode, that is, send 0xA5+0x45+0xEA instructions.

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