ZyAura ZG09 User manual

ZG09 CO
2
Module
http://www.ZyAura.com REV. 082018
ZG09 CO
2
Module
User Manual

ZG09 CO
2
Module
http://www.ZyAura.com REV. 082018
Contents
1 GENERAL DESCRIPTION ....................................................................................................................................................................... 3
2 FEATURES OF DESIGN .......................................................................................................................................................................... 3
3 SPECIFICATION....................................................................................................................................................................................... 3
4 UART ........................................................................................................................................................................................................ 5
5 RS485 COMMUNICATION....................................................................................................................................................................... 7
6 I2C COMMUNICATION ............................................................................................................................................................................ 7
7 PWM OUTPUT.......................................................................................................................................................................................... 7
8 DAV OUTPUT........................................................................................................................................................................................... 8
9 RELIABILITY ............................................................................................................................................................................................ 8
10 RESPONSE TIME................................................................................................................................................................................... 9
11 CO
2
RMS NOISE .................................................................................................................................................................................... 9

ZG09 CO
2
Module
http://www.ZyAura.com REV. 082018
1. General Description
This document describes the user guide of ZG09.
This is a preliminary specification, any update might without notification.
Copyright:
All rights reserved. Reproduction in any manner, in whole or in part is straightly prohibited without written permission of ZyAura.com.
This information contained in this document is subject to change without notice.
Limited Warranty:
This data sheet contains information specific to products manufactured at the time of its publication.Contents herein do not
constitute a warranty.
Trademark Acknowledgements:
All trademarks are the property of their respective owners.
2. Features of Design
NDIR (non-dispersive infrared) sensor
The diffusion and sampling method are both available.
Measurement range: 0~10,000ppm
Output interface: UART, RS485, I2C, PWM, DAC
3. Specification
Communication:
UART 3.3V level
Modbus RTU protocol
RS485 SCL pin for RS485 R/T control pin shared
I2C Max. clock 400kHz
PWM 3.3V level at 1kHz
DAC Output 0~1V = 800~1,200ppm
CO
2
Measurement range 0~10,000ppm
Measurement Interval 2 sec
CO
2
Accuracy ±50ppm±3% of reading
CO
2
RMS Noise <10ppm @ 400ppm, <20ppm @ 1000ppm
CO
2
Repeatability ±20ppm
Resolution 1ppm
Response Time about 1min for diffusion (90% Rise Time)
Pressure Dependence 0.13% of reading per mm Hg
Warm-Up Time (Cold Start) 30 sec @ 25°C
Power Supply 5.0VDC±0.5 supply
Power Consumption Max. (0.8 ms shot capture) <190mA, avg. <34mA
IR OFF Avg. Current (mA) <10mA
Operating Temperature 0~50°C
Storage Temperature -20~60°C
Operating Humidity 0-95% RH
Storage Humidity 0-95% RH
Dimensions 32.2mm x 20.2mm x 13.7mm

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2
Module
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Pin assignment of ZG09
Figure 1. Module External Drawing
Note: The dimensions in this drawing are for reference only.
Pin Configuration:
Pin Function
PWM CO
2
ppm PWM output
DAO DAC output
G Ground
5V Power input +5V
SDA I2C Data pin
SCL I2C Clock pin (default) or RS485 R/T control pin
TX UART TX
RX UART RX
V 3.3V output

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2
Module
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4. UART
UART default:
BPS: 19200
Data Bit: 8
Parity bit: None
Stop bit: 1
Protocol:
The protocol for ZG09 UART is Modbus RTU, commends are for sending and receiving:
Send
ID
(1 Byte)
Function Code
(1 Byte)
Start
(2 Bytes)
Length
(2 Bytes)
CRC
(2 Bytes)
FEH 03H 0000H (Note 1) 0003H XXXX
Receive
ID
(1 Byte)
Function Code
(1 Byte)
Length
(1 Byte)
data
(N Bytes)
CRC
(2 Bytes)
FEH 03H 06H (Note 2) 6 * 8 bit (Note 3) XXXX
Note 1: Start = Start address for getting data. i.e. CO
2
value = 0x0B
Note 2: The length of Data
Note 3: Data length for Receiving = Length for Sending x 2
ID
The user can define the ID code of the device. The factory default is 0x01, 0xFA and 0xFE reserved for broadcast commands.
Function Code
0x03 Read
0x06 Write
Start
Start Read / Write Description
00(0x00) : SlaveID
R/W ID: The factory default is 0x01.
250 (0xFA) and 254 (0xFE) are reserved for broadcast and
cannot be adjusted.
01(0x01) : BPS R/W Baud rate setting (settings will be applied after reset or repower)
0x00 : 9600
0x01 : 19200 (default)
0x02 : 38400
0x03 : 57600
02(0x02) : Uart Parity Set R/W Uart Parity setting (settings will be applied after reset or repower)
0x00:n82
0x01:n81 (default)
0x02:e81
0x03:o81
11(0x0B) : CO
2
Value R CO
2
concentration reading in units of ppm.
Example for getting CO
2
data:
Send the command, FA03 000B 0001 E043, to 250(0xFA) with the broadcast method.
The sensor is addressed as “Any address” (0xFE or 0xFA).
ID
(1 Byte)
Function Code
(1 Byte)
Start
(2 Bytes)
Length
(2 Bytes)
CRC
(2 Bytes) Note
(1) FAH 03H 000BH 0001H E043H
(2) FEH 04H 0003H 0001H D5C5H

ZG09 CO
2
Module
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Commend for data returning 0103 0201 F8B8 56
ID
(1 Byte)
Function Code
(1 Byte)
Length
(1 Byte)
data
(N Bytes)
CRC
(2 Bytes) Note
(1) FAH 03H 02H 01ACH 5C7DH 428ppm
(2) FEH 04H 02H 0197H ED1AH 407ppm
Data length for Receiving =Length for Sending x 2
CO
2
value is 0x01ACH = 428ppm, 0x0197=407ppm
CRC Code
unsigned int Crc16(unsigned char * data, unsigned char length)
{
int j;
unsigned int reg_crc=0xFFFF;
while(length--)
{
reg_crc ^= *data++;
for(j=0;j<8;j++)
{
if(reg_crc & 0x01) /* LSB(b0)=1 */
reg_crc=reg_crc >>1 ^ 0xA001;
else
reg_crc=reg_crc >>1;
}
}
return reg_crc;
}
CRC Code (Lookup Table)
unsigned int Crc(unsigned char *ucTx, unsigned int Len)
{
if (Len && ucTx)
{
unsigned char *ucPtr=ucTx;
unsigned char ucCRCHi = 0xff;
unsigned char ucCRCLo = 0xff;
unsigned uIndex;
while(Len--)
{
uIndex = ucCRCHi ^ *ucPtr++;
ucCRCHi = ucCRCLo ^ ucCRCHigh[uIndex];
ucCRCLo = ucCRCLow[uIndex];
}
return (unsigned int)(ucCRCLo << 8) | (unsigned int)ucCRCHi;
}
else
return 0;
}
unsigned char ucCRCHigh[] =
{
0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,
0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,
0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,
0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,
0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,
0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,
0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,

ZG09 CO
2
Module
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0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,
0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,
0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,
0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,
0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,
0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,
0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,
0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,
0x40
};
unsigned char ucCRCLow[] =
{
0x00,0xc0,0xc1,0x01,0xc3,0x03,0x02,0xc2,0xc6,0x06,0x07,0xc7,0x05,0xc5,0xc4,
0x04,0xcc,0x0c,0x0d,0xcd,0x0f,0xcf,0xce,0x0e,0x0a,0xca,0xcb,0x0b,0xc9,0x09,
0x08,0xc8,0xd8,0x18,0x19,0xd9,0x1b,0xdb,0xda,0x1a,0x1e,0xde,0xdf,0x1f,0xdd,
0x1d,0x1c,0xdc,0x14,0xd4,0xd5,0x15,0xd7,0x17,0x16,0xd6,0xd2,0x12,0x13,0xd3,
0x11,0xd1,0xd0,0x10,0xf0,0x30,0x31,0xf1,0x33,0xf3,0xf2,0x32,0x36,0xf6,0xf7,
0x37,0xf5,0x35,0x34,0xf4,0x3c,0xfc,0xfd,0x3d,0xff,0x3f,0x3e,0xfe,0xfa,0x3a,
0x3b,0xfb,0x39,0xf9,0xf8,0x38,0x28,0xe8,0xe9,0x29,0xeb,0x2b,0x2a,0xea,0xee,
0x2e,0x2f,0xef,0x2d,0xed,0xec,0x2c,0xe4,0x24,0x25,0xe5,0x27,0xe7,0xe6,0x26,
0x22,0xe2,0xe3,0x23,0xe1,0x21,0x20,0xe0,0xa0,0x60,0x61,0xa1,0x63,0xa3,0xa2,
0x62,0x66,0xa6,0xa7,0x67,0xa5,0x65,0x64,0xa4,0x6c,0xac,0xad,0x6d,0xaf,0x6f,
0x6e,0xae,0xaa,0x6a,0x6b,0xab,0x69,0xa9,0xa8,0x68,0x78,0xb8,0xb9,0x79,0xbb,
0x7b,0x7a,0xba,0xbe,0x7e,0x7f,0xbf,0x7d,0xbd,0xbc,0x7c,0xb4,0x74,0x75,0xb5,
0x77,0xb7,0xb6,0x76,0x72,0xb2,0xb3,0x73,0xb1,0x71,0x70,0xb0,0x50,0x90,0x91,
0x51,0x93,0x53,0x52,0x92,0x96,0x56,0x57,0x97,0x55,0x95,0x94,0x54,0x9c,0x5c,
0x5d,0x9d,0x5f,0x9f,0x9e,0x5e,0x5a,0x9a,0x9b,0x5b,0x99,0x59,0x58,0x98,0x88,
0x48,0x49,0x89,0x4b,0x8b,0x8a,0x4a,0x4e,0x8e,0x8f,0x4f,0x8d,0x4d,0x4c,0x8c,
0x44,0x84,0x85,0x45,0x87,0x47,0x46,0x86,0x82,0x42,0x43,0x83,0x41,0x81,0x80,
0x40
};
5. RS485 Communication
Schematic
Figure 2
Connect with the Chip SP3072 for RS-485/RS422 for long distance monitoring. Shield wire is required for long distance. The chip
SP3072 can be powered by 3V power from ZG09 as Figure 2. Keep the lead as short as possible. Please refer Item 4. UART for
Modbus Protocol.
6. I2C Communication
The speed of I2C is 100KHz to 400KHz.

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2
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7. PWM Output
Adjustable CO
2
measurement range PWM VCC (3.0~3.3V) level at 1 kHz output 0~10,000ppm. Schematic is as Figure 3.
AL1=0~10,000ppm, AL2=0~10,000ppm. The AL1<AL2 setting is for HVAC. AL1>AL2 setting is for agriculture, If the gas
concentration for agriculture is 0-10,000ppm, then the AL1=0ppm, AL2=10,000ppm.
Figure 3
Application AL1 0~10,000ppm AL2 0~10,000ppm Remark
CO
2
monitoring 0ppm (0V) 10,000ppm (VCC)
HVAC 800ppm default (<800ppm=0V) 1200ppm default (>1200ppm=VCC) Note 1
Agriculture Adjustable Adjustable Note 2
Note 1: For HVAC, the ventilation will be activated when the CO
2
concentration is higher than AL2 1200ppm (adjustable). The
ventilation will be inactivated when the CO
2
lower than 800ppm(adjustable).
Note 2: For planting, the alarm setting is AL1>AL2. The CO
2
generator will be activated when the CO
2
concentration is lower than
AL2 400ppm (adjustable). The CO
2
generator will be inactivated when the CO
2
concentration is higher than AL2 1200ppm
(adjustable). The difference between AL1 and AL2 has to be 100ppm at least.
8. DAV Output
DAV output can be controlled by user. For high precise CO
2
monitoring is not recommended. Output 0~1V = default 800~1,200ppm
(210 steps). The range can be controlled by AL1 and AL2. Users can use comparator to control the relay. AL2>AL1 is for HVAC.
AL1>AL2 is for agriculture. When AL1 is 800ppm and the CO
2
reading is also 800ppm, DAV output is 0V. AL1=0 and
AL2=10,000ppm is for full range output.
9. Reliability
9.1 Long term stability
16 samples were on long-term test (25°C, 70% RH, 500 hours) and the average results are shown in Figure 4.
The Y axis is the CO
2
concentration and the X axis is the time.
Figure 4

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2
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9.2 Temperature cycle test
16 samples were on long-term test (-20°C, +65, +60°C, 85% RH, 400 hours) and the average results are shown in Figure 5.
The Y axis is the CO
2
concentration and the X axis is the time.
Figure 5
9.3 High/Low temperature test
The performance of CO
2
, at -20°C~60°C and 5V±0.25V, is displayed on Figure 6. The performance is consistent in 4.75~5.25V.
The accuracy will be affected when the voltage drops to 4.5V.
Figure 6
10. Response Time
It shows how much time is needed for CO
2
monitor to reach the 90% response to step change. Test methods 1: putting the
monitor in the environment at 1,000ppm in 10 minutes, then move it to the environment at 400ppm.
Test method 2: putting the monitor in the environment at 400ppm in 10 minutes, then move it to the environment at 1,000ppm.
Test Method Time
400ppm~1,000ppm ~60sec (90% response to step change)
1,000ppm~400ppm ~120sec (90% response to step change)
11. CO
2
RMS Noise
Measure for 3 hours in conditions: CO
2
concentration of 1000ppm and 25°C±2°C.
The stability and variation are less than ±20ppm.
Figure 7