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Hardware setup
HomeKid edited this page Sep 26, 2019
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15 revisions
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The sensor using I2C bus,
SDA
andSCL
pins must be pulled up via 10K resistors from 3.3V according to iAQ Core C's datasheet! See schematic below! -
I2C bus pins on ESP12E/F boards are
GPIO5 - SCL
andGPIO4 - SDA
. If you are using Wemos D1 mini, I2C pins areSCL - D1
andSDA - D2
! -
This sensor also has an option for resetting to factory default. Long pressing for 10 seconds a button connected to
GPIO0 and GND
will reset the sensor! -
DHT22 sensor's data pin is connected to
GPIO12 (Wemos D6)
via 4.7K pullup resistor from 3.3V!
![](https://github.com/HomeKidd/ESP8266-HomeKit-Air-Quality-Sensor/raw/master/images/IAQ-CORE%20C.jpg)
![](https://github.com/HomeKidd/ESP8266-HomeKit-Air-Quality-Sensor/raw/master/images/IAQ_schematic.png)
![](https://github.com/HomeKidd/ESP8266-HomeKit-Air-Quality-Sensor/raw/master/images/iaq_pcb.png)