https://senseair.com/products/size-counts/s8-residential/
ABC Period: 8 days. The default “tuning speed” is limited to about 30-50ppm/ABC period.
Measurement interval: 4 sec.
Power supply: 4.5 —5.25V unprotected against surges and reverse connection
Power consumption: 300mA peak
AliExpress: 23$
4.5 V to 5.25 V DC
| PIN | ||
|---|---|---|
| G0 | Power supply minus terminal Sensor’s reference (ground) terminal | |
| G+ | VCC | 4.5—5.25V |
| Alarm_OC | Open Collector output for alarm indication | |
| PWM 1 kHz | PWM output. Configured as digital output Used for direct reading by customer’s microcontroller or to provide analog output. | 0%, output Low 100%, output High |
| DVCC_out | from sensor’s voltage regulator Output may be usedto logical level converter if master processor runs at 5V | 3.3VDC 6mA max |
| UART_TxD | UART data receive line, digital output | |
| UART_RxD | UART data receive line, digital input | |
| UART_R/T | Direction control line for half duplex RS485 transceiver like MAX485 | |
| bCAL_in/ CAL | background calibration, which requires that the sensor is exposed to fresh air 400ppm CO2 (4-8 sec) CAL (zero calibration), cell to be completely evacuated from CO2 (>16 sec), closed to G0 |
