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Winsen sensors

Warning

This sensors are 3.3V devices. They require 5V power to operate. However, on some sensors the I/O pins are not 5V tolerant and the sensor will be damaged by 5V logic.

Sensor --sensor-model PM1 PM2.5 PM10 CO2
MH-Z19B MHZ19B
ZH03B ZH0xx
ZH06-I ZH0xx
Sensor Datasheet Dimensions Connector
MH-Z19B en 40×20×9 mm³ 7 pin
ZH03B en 50x32x21 mm³ 8 pin
ZH06-I en 47×37×12 mm³ 8 pin

Connector

7 pin Molex 1.25mm "PicoBlade" 51021 compatible, found online as 1.25mm JST.

Pin Name Voltage Function
1/2 reserved
3 GND 0V
4 VCC 5V
5 RX 3.3V TTL serial port
6 TX 3.3V TTL serial port
7 reserved

8 pin Molex 1.25mm "PicoBlade" 51021 compatible, found online as 1.25mm JST.

Pin Name Voltage Function
1 VCC 5V
2 GND 0V
3 reserved
4 RX 3.3V TTL serial port
5 TX 3.3V TTL serial port
6/7 NC reserved
8 PWM 3.3V PWM PM2.5 0-1000 μg/m³

Protocol

Serial protocol is UART 9600 8N1 3.3V TTL.

Note

The MHZ19B datasheet advertized interface as 5V tolerant. However, the this sensor has only been tested with a 3.3V interface.

The datasheet also mentions that this sensor needs to warm up for 180 s. Therefore, no measurements will be requested until the warm up period is completed.

Command --sensor-model Description message
active_mode ZH0xx continuous operation FF 01 78 40 00 00 00 00 47
passive_mode ZH0xx & MHZ19B single-shot operation FF 01 78 41 00 00 00 00 46
passive_read ZH0xx trigger single-shot measurement FF 01 86 00 00 00 00 00 79
sleep ZH0xx sleep mode FF 01 A7 01 00 00 00 00 57
wake ZH0xx wake up from sleep mode FF 01 A7 00 00 00 00 00 58
MHZ19B 400 ppm CO2 (zero point) calibration FF 01 87 00 00 00 00 00 78
MHZ19B 1000 ppm CO2 (span point) calibration FF 01 88 03 E8 00 00 00 8C
MHZ19B 2000 ppm CO2 (span point) calibration FF 01 88 07 D0 00 00 00 A0

Messages containing measurements consist of unsigned short integers. The last bit of the message should contain 0x100 - sum(message[1:-1]) % 0x100.

message MHZ19B ZH0xx
9 bits 9
header 2 bits 2 bits
FF 86 FF 86
body 6 bits 6 bits
1 values, 2 reserved 3 values
checksum 1 bit 1 bit

The message body (message[2:4]) contains 1 value:

  • co2: CO2 concentration [ppm]

The message body (message[2:8]) contains 3 values:

  • pm01, pm25, pm10: PM1.0, PM2.5, PM10 [μg/m³]

MHZ19B

About the MHZ19B sensor (-m MHZ19B)

pms -m MHZ19B info

Winsen MH-Z19B sensor observations

time                                    measurement time [seconds since epoch]
CO2                                     CO2 concentration [ppm]

String formats: co2 (default), csv and header

Read 10 samples (-n 10), one sample every 10 seconds (-i 10)

pms -m MHZ19B -n 10 -i 10 serial

2021-07-04 19:17:36: CO2 636 ppm
2021-07-04 19:17:46: CO2 636 ppm
2021-07-04 19:17:56: CO2 636 ppm
2021-07-04 19:18:06: CO2 636 ppm
2021-07-04 19:18:16: CO2 636 ppm
2021-07-04 19:18:26: CO2 636 ppm
2021-07-04 19:18:36: CO2 636 ppm
2021-07-04 19:18:46: CO2 636 ppm
2021-07-04 19:18:56: CO2 635 ppm
2021-07-04 19:19:06: CO2 633 ppm

Print on CSV format (-f csv)

pms -m MHZ19B -n 10 -i 10 serial -f csv

time, CO2
1625419056, 636
1625419066, 636
1625419076, 636
1625419086, 636
1625419096, 636
1625419106, 636
1625419116, 636
1625419126, 636
1625419136, 635
1625419146, 633

Print on hexdump format (-f hexdump)

pms -m MHZ19B -n 10 -i 10 serial -f hexdump

00000000: ff 86 02 7c 42 00 00 00 ba  ...|B....
00000009: ff 86 02 7c 42 00 00 00 ba  ...|B....
00000012: ff 86 02 7c 42 00 00 00 ba  ...|B....
0000001b: ff 86 02 7c 42 00 00 00 ba  ...|B....
00000024: ff 86 02 7c 42 00 00 00 ba  ...|B....
0000002d: ff 86 02 7c 42 00 00 00 ba  ...|B....
00000036: ff 86 02 7c 42 00 00 00 ba  ...|B....
0000003f: ff 86 02 7c 42 00 00 00 ba  ...|B....
00000048: ff 86 02 7b 42 00 00 00 bb  ...{B....
00000051: ff 86 02 79 42 00 00 00 bd  ...yB....

ZH0xx

About the sensors supported by the ZH0xx protocol (-m ZH0xx)

pms -m ZH0xx info

Winsen ZH03B and ZH06-I sensor observations

time                                    measurement time [seconds since epoch]
pm01, pm25, pm10                        PM1.0, PM2.5, PM10 [μg/m3]

String formats: pm (default), csv and header

Read 10 samples (-n 10), one sample every 10 seconds (-i 10)

pms -m ZH0xx -n 10 -i 10 serial

Print on CSV format (-f csv)

pms -m ZH0xx -n 10 -i 10 serial -f csv

Print on hexdump format (-f hexdump)

pms -m ZH0xx -n 10 -i 10 serial -f hexdump