MH-Z16 Intelligent Infrared Gas Module Manual

Zhengzhou Winsen Electronics Technology CO.,LTD

1 Profile

Main functions and features：  High sensitivity,High resolution  Low power consumption  Output method:UART,analog voltage signal,PWM wave  Quick responce  Temperature compensation,excellent linear output  Good stability  Long lifespan  Anti water vapor interference  No poisoning

2 Main technical paremeters Working voltage

4.5 V ~ 5.5V DC

Average current

< 85 mA

Interface level

3.3 V

Measuring range

0~5%VOL optional

Output signal

PWM UART

Preheat time

3min

Reponse Time

T90

Working temperature

0℃ ~ 50℃

Working humidity

0~95%RH

Weight

21 g

Lifespan

>5 year

< 30s

Target Gas

Measuring Range

Accuracy

0~2000ppm 0~5000ppm Carbon Dioxide (CO2)

0~1%VOL 0~3%VOL 0~5%VOL

3.Structure

Definition for pins

±(50ppm +5%readin g value)

Mark Temperature compensation Temperature compensation Temperature compensation Temperature compensation Temperature compensation

4.Pin

PIN

Description

Pad4

Vin(input voltage 4.5V～5.5V）

Pad3

GND

Pad2

5.Circuit

Vout

(0.4～2V,custom made)

Pad7

PWM

Pad1

HD

Pad5

UART（RXD）

0～3.3V input digital

Pad6

UART（TXD）

0～3.3V output digital

6. Operating instruction 6.1 Analog output connections The output value of Vout is 0.4-2.0V, which stands for 0 to full range Vin –5V GND- Power Ground Vout-ADC input

6.2PWM output (taking PWM output from 2000ppm as example): CO2 output range: 0ppm-2000ppm Cycle: 1004ms±5% High level output for beginning: 2ms (in name) Middle of cycle: 1000ms±5% Low level output for ending: 2ms（in name） Account formula for CO2 concentration which gets through PWM:

C ppm  2000  (TH  2ms) /(TH  TL  4ms) Among:

C ppm

is calculated CO2 concentration, unit is ppm;

TH is time for high level during an output cycle; TL is time for low level during an output cycle.

6.3 Digital connects: Vin-5V power GND- Power Ground RXD connect sensor TXD TXD connect sensor RXD You can read gas concentration via Uart, no need to calculate. 6.3.1communication protocol 1.General Settings Baud rate Date byte

9600 8 byte

Stop byte

1byte

Calibrate byte

no

2.Command Each command or return： Contains 9 bytes (byte 0 ~ 8) starting byte fixed 0 XFF

command contains sensor number (factory default to 0 x01) to check and end Command List: 0x86

Gas concentration

0x87

Calibrate zero point（ZERO）

0x88

Calibrate span point（SPAN）

Read gas concentration Send command Byte0

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Start

Sensor

command

-

-

-

-

-

Check

ing

No.

value

byte 0XFF

0x01

0x86

0x00

0x00

0x00

0x00

0x00

0x79

Return value Return Byte0

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte 8

Start

command

High

Low

ing

level

level

k

byte

concentr

concentr

valu

ation

e

ation 0XFF

0x86

0x02

0x60

-

0x47

-

0x00

-

0x00

-

0x00

Chec

0xD1

Gas concentration= high level *256+low level Calibrate zero point Send command Byte0

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Start

Sensor

command

-

-

-

-

-

Check

ing

No.

value

byte 0XFF

0x01

0x87

0x00

0x00

0x00

0x00

0x00

0x78

No return value Calibrate span point Send command Byte0

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Start

Sensor

command

High

Low

-

-

-

Check

ing

No.

level

level

span

span

point

point

byte

0XFF

0x01

No return value

0x88

0x07

0xD0

value

0x00

0x00

0x00

0xA0

3.Calibrate and calculate The checksum = (invert (byte 1 +... + 7)) + 1 Reading gas concentration: Send command Byte0

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Start

Sensor

command

-

-

-

-

-

Check

ing

No.

value

byte 0XFF

0x01

0x86

0x00

0x00

0x00

0x00

0x00

0x79

Except byte 0 ,add the other bytes together 0x1 + 0x86 + 0 + 0 + 0 + 0 + 0 = 0x87

Get the value from the first step, then invert it. 0xff – 0x87 = 0x78

The second value plus one 0x78 + 0x01 = 0x79

Program :C language char getCheckSum(char *packet) { char i, checksum; for( i = 1; i < 8; i++) { checksum += packet[i]; } checksum = 0xff – checksum; checksum += 1; return checksum; }

7. Notes for maintenance 7.1 The sensor should be calibrated regularly. The cycle time is better to be no more than 6 months. 7.2 Do not use the sensor in the high dusty environment for long time. 7.3 Please use the sensor with correct power supply. 7.4 Forbidden to cut the sensor pin. Zhengzhou Winsen Electronics Technology Co., Ltd Add.: NO.299 Jin Suo Road, National Hi-Tech Zone, Zhengzhou, 450001 China Tel.: 0086-371-67169097 67169670 Fax:0371-60932988 E-mail:[email protected]

MH-Z16 Datasheet - Sandbox Electronics

6.2PWM output (taking PWM output from 2000ppm as example):. CO2 output range: 0ppm-2000ppm. Cycle: 1004ms±5%. High level output for beginning:.
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