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The ES-103 CO2 module
is designed to measure
CO2 level in the air. This
product is maintenance-
free, low cost and integrated
into other equipments
especially. It’s main application
area is Indoor Air Quality,
HVAC, CO2 transmitter, Agriculture.
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Measurement Range>? 0三?5000ppm>?selection of range>?
Resolution>? 5ppm>?0三?2000ppm>?
10ppm>?2000三?5000ppm>?
Precision>? f50ppm
Repeatability>? f30ppm
Step Response Time(90%)>? 30 Sec
warm-upTime>? >?3 Min
Operating Temperature>? 0三?60、?
Operating Humidity>? 0%三?90%RH>?Non-condensing>?
Storage Temperature: -20三?60、?
Power Input>? 4三?6V
Current consumption>?Max�>?100mA, Average>?50mA
Work life>? >?5Years
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Signal>?Simulation Voltage Output>?PWM Output and UART Output
Pad1、? Pad15>?Vin>?Power Input 4~6 V>?
Pad2、?Pad3、? Pad12>?GND
Pad4>?DAC2
Pad5>?DAC1
Pad6>?PWM output
Pad7、? Pad8、? Pad9>?NC
Pad10、?Pad13>?UART>?RXD>? 0三?3.3V Date Input
Pad11、?Pad14>?UART>?TXD>? 0三?3.3V Date Input
三?、?Simulation Voltage Output
DAC1 Voltage Output Range>?0三?2.5V>?>?parallelism CO2 concentration>?0三?
full range>?
DAC2 Voltage Output Range>?0.4三?2V>?>?parallelism CO2 concentration>?0三?
full range>?
二?、?PWM Output
CO2 concentration Output range 0ppm三?2000ppm
OC Allow Max Current 5mA maximum
period 1004mVf���
period began part high YROW�RXWSXW������PV>?QRPLQDO>?�
PLGGOH�SDUW�SHULRG��������������������PVf���
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3:0�JHW�QRZ�&2��concentration date>?�
)4/()2(2000 msTTmsTC LHHppm −+−×=
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among>?�
ppmC
���calculate and receive the CO2 concentration Date>?XQLW�LV�SSP>?�
HT �RQH�RXWSXW�SHULRG三?V�KLJK�YROW�WLPH>?�
LT �RQH�RXWSXW�SHULRG三?V�ORZ�YROW�WLPH>?�
Figure3>?PWM Output sketch map
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三?、?UART communicate agreement
Date get of proceeding and hardware of RS232 communication
Baud rate>?9600; Number of Bits:8 Bits; Stop Bit:1 Bit>?None verify Bit
Each date 9 bits>?0xff Began>?verify number over
Verify number = >?Get negative>?DATA1+DATA2+、>、>+DATA7>?>?+1
1、?Read sensoU�concentration date and temperature date>?
lead computer send sensor concentration date: as follows is send order>?
0 1 2 3 4 5 6 7 8
Began
0XFF
Monitor
Serial number
Instruct
0x86
00 00 00 00 00 verify
number
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Second computer return date pattern>?
0 1 2 3 4 5 6 7 8
Began
0XFF
Monitor
Serial number
Passage
high
Passage
low
temperature
passage
Verify
date
Gas concentration date = high *256+ low, Sensor Serial number>?0x01
Environment T Date = T Passage
2. Zero verify: 0xff, 0x87,0x87,0x00,0x00,0x00,0x00,0x00,0xf2
First bit(0xff) is began bit>?Second (0x87)is repeat order>?Third(0x87)is order, after
five bit is random date, last bit(0xf2)is verify and none return message、?
CO2 sensor zero verify need giving five minute N2、?
3. SPAN dot verify>?0xff,0x88,0x88,0x00,0x00,0x00,0x00,0x00,0xf0
First bit(0xff) is began bit>?Second (0x88)is repeat order>?Third(0x88)is order, fourth
bit is span high date>?Fifth bit is span low date>?After three bits is random date, last
bit (0xf0) is verify and none return message、?
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