Update README.md

diyruz · Jan 15, 2021 · ce8dca5 · ce8dca5
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 Use [external converters](https://www.zigbee2mqtt.io/information/configuration.html#external-converters-configuration) feature
 
 Converter file located [here](./converters/DIYRuZ_AirSense.js)
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+# User interface
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+LED1 blinks when accessing the CO2 sensor.
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+LED2 blinks if the CO2 value is higher than the first set point, while LED3 is off.
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+LED3 blinks if the CO2 value is higher than the second set point, while LED2 is on.
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+SW2 reset and join E18
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+SW1 CO2 calibration