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7. Output
PWM output
Take 0~2000ppm for example
CO2 output range
0~2000ppm
Cycle
1004ms±5%
Cycle start high level output
2ms(theoretical value)
The middle cycle
1000ms±5%
cycle end low level output
2ms(theoretical value)
CO2 concentration: Cppm=2000×(TH-2ms)/(TH+TL-4ms)
C
ppm
: CO2 concentration could be calculated by PWM output
TH high level output time during cycle
TL low level output time during cycle
Serial port output (UART)
Hardware connection
Connect module’s Vin-GND-RXD-TXD to users’ 5V-GND-TXD-RXD.
(Users must use TTL level. If RS232 level, it must be converted.)