57 lines
2.3 KiB
Markdown
57 lines
2.3 KiB
Markdown
# CCS811 Driver Examples
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These examples demonstrate the usage of the CCS811 driver with only one sensors.
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## Hardware setup
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Most examples use only one CCS811 sensor. Following figure shows the hardware configuration if no interrupt is used.
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```
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+------------------------+ +--------+
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| ESP8266 Bus 0 | | CCS811 |
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| GPIO 5 (SCL) >----> SCL |
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| GPIO 4 (SDA) ------ SDA |
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| GND -----> /WAKE |
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+------------------------+ +--------+
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```
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If *nINT* interrupt is used to fetch new data, additionally the interrupt pin has to be connected to a GPIO pin.
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```
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+------------------------+ +--------+
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| ESP8266 Bus 0 | | CCS811 |
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| GPIO 5 (SCL) >----> SCL |
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| GPIO 4 (SDA) ------ SDA |
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| GPIO 2 <----- /nINT |
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| GND -----> /WAKE |
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+------------------------+ +--------+
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```
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In examples where CCS811 sensor is used in conjunction with a SHT3x sensor, the hardware configuration looks like following:
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```
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+------------------------+ +--------+
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| ESP8266 Bus 0 | | CCS811 |
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| GPIO 5 (SCL) >--+----> SCL |
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| GPIO 4 (SDA) ---|-+--- SDA |
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| GND ---|-|--> /WAKE |
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| | | | +--------+
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| | | | | SHT3x |
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| | +----> SCL |
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| | +--- SDA |
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+------------------------+ +--------+
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```
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## Example description
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__*ccs811_one_sensor*__
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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```.
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__*ccs811_plus_sht3x*__
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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.
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__*ccs811_temperature*__
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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.
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