Environment X6 Sensor

SKU	Product
34169	Environment X6 Sensor

Features

The Environment X6 Sensor is built on EC Sense's (Germany) solid-state polymer electrochemical technology. It uses a multi-electrode integrated structure with a solid-state electrolyte system, generating current signals through electrochemical reactions of gases on the working electrode surface to achieve high-sensitivity detection of target gas concentrations. Compared to conventional gas sensors, the solid-state polymer design offers advantages such as no electrolyte leakage, no poisoning, virtually zero drift, and extended service life.

Application Scenarios

Smart home
Ambient air quality monitoring
In-vehicle air purifiers
Handheld air quality detectors
Factory ventilation systems

Working Principle

The solid-state polymer electrochemical sensor uses a classic three-electrode system (Working Electrode WE, Reference Electrode RE, Counter Electrode CE) with multi-layer printing technology. Through a single-electrode multi-layer catalytic active site design, diffusion control layer structure, and intelligent signal decoupling algorithms, it enables parallel detection and identification of multiple gases.

Specifications

Environment X6 Sensor
Supply Voltage	5V	Logic Voltage	3.3V
Communication Interface	UART	Baud Rate	9600 bps
Measurement Range	HCHO: 0-1 ppm TVOC: 0-5 ppm CO: 0-100 ppm	Resolution	HCHO: 0.001 ppm (Limit of Detection: 0.015 ppm) TVOC: 0.001 ppm (Limit of Detection: 0.050 ppm) CO: 0.001 ppm (Limit of Detection: <8 ppm)
Accuracy	HCHO: 0-0.15 ppm (±0.02 ppm); 0.16 ppm+ (< ±2% FS) TVOC: 0-0.2 ppm (±0.05 ppm); 0.2 ppm+ (< ±2% FS) CO: 0-8 ppm (±2.5 ppm); 8 ppm+ (< ±1% FS)	Response Time	HCHO: T10 <5 s; T90 <90 s TVOC: T10 <3 s; T90 <120 s CO: T10 <3 s; T90 <15 s
Dimensions	23 × 25.5 × 9.5 mm	Mounting Hole Diameter	2.0 mm
Operating Current	6.5 mA	Operating Temperature	-40 ℃ ~ +55 ℃
Operating Humidity	>15％RH	Service Life	10 years

warning

The sensor operates at 3.3V logic levels. If using 5V logic, a level shifter is required; otherwise the sensor may be damaged.

Pin Description

Pin	Label	Description
1	VCC	5V Power Supply
2	GND	Ground
3	RXD	UART Input
4	TXD	UART Output

Protocol Details

Click to expand

UART Communication Flow

Default serial configuration: 8 data bits, 1 stop bit, no parity, no flow control, default baud rate 9600
The protocol consists of a command header, data field, and 0-add8 checksum
Note: Protocol packets follow big-endian byte order (most significant byte first)

Command Reference

General Notes

Checksum algorithm: 0-add8 (sum all bytes in the packet, take the lower 8 bits, bitwise invert, then add 1)
Byte order: Big-endian (most significant byte first)

Reference Information

Gas Concentration Unit Table

Code	Unit	Description
0x00	IAQ	Indoor Air Quality Index
0x02	ppm	Parts per million

IAQ Level Descriptions (based on EPA standards):

Range	Level
0–50	Good
51–100	Moderate
101–150	Unhealthy for Sensitive Groups
151–200	Unhealthy
201–300	Very Unhealthy
301–500	Hazardous

Sensor Type Code Table

Gas Type	Code
IAQ	0x33
TVOC	0x18
HCHO	0x17
CO	0x19

Query Current Concentration (0x70)

Reads the real-time concentration of all gases, along with temperature and humidity.

Send (Tx)

Header	Checksum
Byte0	Byte1
70	0-add8

Response (Rx)

Header	IAQ Data	TVOC Data	HCHO Data	CO Data	Temperature Data	Humidity Data	Checksum
Byte0	Byte1-Byte4	Byte5-Byte8	Byte9-Byte12	Byte13-Byte16	Byte17-Byte18	Byte19-Byte20	Byte21
70	42 30 00 00	3D 35 64 F0	3D 53 D2 5B	3D 08 19 55	0A C8	27 0F	E0

Example Breakdown

Send: 0x70 0x90
      │     └── Checksum
      └── Header

Response: 0x70 0x42300000 0x3D3564F0 0x3D53D25B 0x3D081955 0x0AC8 0x270F 0xE0
          │     │          │          │          │          │      │      └── Checksum
          │     │          │          │          │          │      └── Humidity: 0x270F = 9999 → 99.99% RH (2 decimal places)
          │     │          │          │          │          └── Temperature: 0x0AC8 = 2760 → 27.60 ℃ (2 decimal places)
          │     │          │          │          └── CO:   IEEE 754 float → 0.033 ppm
          │     │          │          └── HCHO: IEEE 754 float → 0.052 ppm
          │     │          └── TVOC: IEEE 754 float → 0.044 ppm
          │     └── IAQ:  IEEE 754 float → 44.000
          └── Header

Read Sensor Parameters (0x72)

Queries the detection range and concentration unit of a specified gas channel.

Send (Tx)

Header	Gas Index	Checksum
Byte0	Byte1	Byte2
72	00	0-add8

Gas index mapping: 0x00 = IAQ, 0x01 = TVOC, 0x02 = HCHO, 0x03 = CO

Response (Rx)

Header	Gas Index	Gas Name	Range	Unit	Checksum
Byte0	Byte1	Byte2	Byte3-Byte4	Byte5	Byte6
72	00	19	03 E8	02	87

Example Breakdown

Send: 0x72 0x00 0x8D
      │     │    └── Checksum
      │     └── Gas index: IAQ
      └── Header

Response: 0x72 0x00 0x19 0x03E8 0x02 0x87
          │     │    │    │      │    └── Checksum
          │     │    │    │      └── Concentration unit: 0x02 = ppm (see Gas Concentration Unit Table)
          │     │    │    └── Range: 0x03E8 = 500
          │     │    └── Gas name: 0x19 = CO (see Sensor Type Code Table)
          │     └── Gas index: IAQ
          └── Header

Read LED Status (0x74)

Queries the current state of the status indicator LED.

Send (Tx)

Header	Checksum
Byte0	Byte1
74	0-add8

Response (Rx)

Header	LED Status	Checksum
Byte0	Byte1	Byte2
74	01	8B

Example Breakdown

Send: 0x74 0x8C
      │     └── Checksum
      └── Header

Response: 0x74 0x01 0x8B
          │     │    └── Checksum
          │     └── LED status: 0x01 = Blinking (0x00 = Off, any other value = Blinking)
          └── Header

Set LED Status (0x56)

Controls the on/off state of the status indicator LED.

Send (Tx)

Header	LED Control	Checksum
Byte0	Byte1	Byte2
56	00	0-add8

LED control values: 0x00 = Off, 0x01 = On

Response (Rx)

Header	Reserved	Return Value	Checksum
Byte0	Byte1	Byte2-Byte3	Byte4
56	00	4F 4B	10

Example Breakdown

Send: 0x56 0x00 0xAA
      │     │    └── Checksum
      │     └── LED control: Turn off the LED
      └── Header

Response: 0x56 0x00 0x4F4B 0x10
          │     │    │      └── Checksum
          │     │    └── Return value: "OK" (setting successful)
          │     └── Reserved
          └── Header

Enter Sleep Mode (0x54)

Puts the sensor into low-power sleep mode.

Send (Tx)

Header	Sleep Command	Checksum
Byte0	Byte1-Byte5	Byte6
54	73 6C 65 65 70 (ASCII: sleep)	0-add8

Response (Rx)

Header	Reserved	Return Value	Checksum
Byte0	Byte1	Byte2-Byte3	Byte4
54	00	4F 4B	12

Example Breakdown

Send: 0x54 0x73 0x6C 0x65 0x65 0x70 0x93
      │     │                        └── Checksum
      │     └── ASCII: "sleep"
      └── Header

Response: 0x54 0x00 0x4F4B 0x12
          │     │    │      └── Checksum
          │     │    └── Return value: "OK" (command executed successfully)
          │     └── Reserved
          └── Header

Exit Sleep Mode (0x55)

Wakes the sensor and resumes normal operation.

Send (Tx)

Header	Wake Command	Checksum
Byte0	Byte1-Byte5	Byte6
55	61 77 61 6B 65 (ASCII: awake)	0-add8

Response (Rx)

Header	Reserved	Return Value	Checksum
Byte0	Byte1	Byte2-Byte3	Byte4
55	00	4F 4B	11

Example Breakdown

Send: 0x55 0x61 0x77 0x61 0x6B 0x65 0xA2
      │     │                        └── Checksum
      │     └── ASCII: "awake"
      └── Header

Response: 0x55 0x00 0x4F4B 0x11
          │     │    │      └── Checksum
          │     │    └── Return value: "OK" (command executed successfully)
          │     └── Reserved
          └── Header

Get Sensor Serial Number (0x71)

Reads the sensor's 6-byte unique serial number.

Send (Tx)

Header	Checksum
Byte0	Byte1
71	0-add8

Response (Rx)

Header	Sensor SN	Checksum
Byte0	Byte1-Byte6	Byte7
71	12 34 56 78 91 23	C7

Example Breakdown

Send: 0x71 0x8F
      │     └── Checksum
      └── Header

Response: 0x71 0x12 0x34 0x56 0x78 0x91 0x23 0xC7
          │     │                              └── Checksum
          │     └── Sensor serial number: 123456789123
          └── Header

Get Firmware Version (0x73)

Reads the sensor's firmware version information.

Send (Tx)

Header	Checksum
Byte0	Byte1
73	0-add8

Response (Rx)

Header	Firmware Version	Checksum
Byte0	Byte1-Byte19	Byte20
73	69 4E 6F 73 65 58 36 32 30 32 35 31 31 31 32 31 34 33 39	A2

Example Breakdown

Send: 0x73 0x8D
      │     └── Checksum
      └── Header

Response: 0x73 0x694E6F736558363230323531313132313433390 0xA2
          │     │                                         └── Checksum
          │     └── ASCII: "iNoseX6202511121439" (firmware version)
          └── Header

API Overview

Click to expand

environment_x6_init(): Initializes the Environment X6 Sensor
environment_x6_get_concentration(): Retrieves real-time concentration values
environment_x6_get_sensor_param(): Retrieves sensor parameters, including detection range and units
environment_x6_get_led(): Gets the current LED status (on or off)
environment_x6_set_led(): Sets the LED status
environment_x6_sleep(): Puts the sensor into sleep mode
environment_x6_wakeup(): Wakes the sensor from sleep mode
environment_x6_get_serial(): Retrieves the serial number
environment_x6_get_version(): Retrieves the firmware version

Quick Test

Testing software: Serial Debugging Assistant paired with a USB-to-TTL adapter for quick verification
Test preparation
- Windows PC
- USB TO TTL (B) × 1
- Environment X6 Sensor × 1
- Connection cables
Hardware connection
- Connect the components as shown below
Testing procedure
- Connect the USB-to-TTL adapter to a USB port on your PC
  - Open the Serial Debugging Assistant (SSCOM), select the correct COM port, set the baud rate to 9600, open the port, and set the checksum mode to 0-add8
  - Send the command in hexadecimal: 70, and the sensor data will be returned:
① Send the query command
② Receive real-time data

Give Feedback

Features​

Application Scenarios​

Working Principle​

Specifications​

Pin Description​

Protocol Details​

UART Communication Flow​

Command Reference​

General Notes​

Reference Information​

Query Current Concentration (0x70)​

Read Sensor Parameters (0x72)​

Read LED Status (0x74)​

Set LED Status (0x56)​

Enter Sleep Mode (0x54)​

Exit Sleep Mode (0x55)​

Get Sensor Serial Number (0x71)​

Get Firmware Version (0x73)​

API Overview​

Quick Test​

Features

Application Scenarios

Working Principle

Specifications

Pin Description

Protocol Details

UART Communication Flow

Command Reference

General Notes

Reference Information

Query Current Concentration (0x70)

Read Sensor Parameters (0x72)

Read LED Status (0x74)

Set LED Status (0x56)

Enter Sleep Mode (0x54)

Exit Sleep Mode (0x55)

Get Sensor Serial Number (0x71)

Get Firmware Version (0x73)

API Overview

Quick Test