History

Gunar Schorcht 8325bb87c5 Minor changes in CCS811 driver (#542 )		2018-01-20 17:02:31 +05:00
..
ccs811_one_sensor	Minor changes in CCS811 driver (#542 )	2018-01-20 17:02:31 +05:00
ccs811_plus_sht3x	- small corrections	2017-12-21 19:00:16 +01:00
ccs811_temperature	- small corrections	2017-12-21 19:00:16 +01:00
README.md	- small corrections	2017-12-21 19:00:16 +01:00

README.md

CCS811 Driver Examples

These examples demonstrate the usage of the CCS811 driver with only one sensors.

Hardware setup

Most examples use only one CCS811 sensor. Following figure shows the hardware configuration if no interrupt is used.

  +------------------------+    +--------+
  | ESP8266  Bus 0         |    | CCS811 |
  |          GPIO 5 (SCL)  -----> SCL    |
  |          GPIO 4 (SDA)  <----> SDA    |
  |          GND           -----> /WAKE  |
  +------------------------+    +--------+

If nINT interrupt is used to fetch new data, additionally the interrupt pin has to be connected to a GPIO pin.

  +------------------------+    +--------+
  | ESP8266  Bus 0         |    | CCS811 |
  |          GPIO 5 (SCL)  -----> SCL    |
  |          GPIO 4 (SDA)  <----> SDA    |
  |          GPIO 2        <----- /nINT  |
  |          GND           -----> /WAKE  |
  +------------------------+    +--------+

In examples where CCS811 sensor is used in conjunction with a SHT3x sensor, the hardware configuration looks like following:

  +------------------------+       +--------+
  | ESP8266  Bus 0         |       | CCS811 |
  |          GPIO 5 (SCL)  ---+----> SCL    |
  |          GPIO 4 (SDA)  <--|-+--> SDA    |
  |          GND           ---|-|--> /WAKE  |
  |                        |  | |  +--------+
  |                        |  | |  | SHT3x  |
  |                        |  +----> SCL    |
  |                        |    +--> SDA    |
  +------------------------+       +--------+

Example description

ccs811_one_sensor

Simple example with one CCS811 sensor connected to I2C bus 0. It demonstrates the different approaches to fetch the data. Either the interrupt nINT is used when new data are available or exceed defined thresholds or the new data are fetched periodically. Which approach is used is defined by the constants INT_DATA_RDY_USED and INT_THRESHOLD_USED.

ccs811_plus_sht3x

Simple example with one CCS811 sensor connected to I2C bus 0 and one SHT3x sensor to determine ambient temperature. New data are fetched peridically every 2 seconds.

ccs811_temperature

Simple example with one CCS811 sensor connected to I2C bus 0. It demonstrates how to use CCS811 with an external NTC resistor to determine ambient temperature.