This is a simple Air Quality Sensor for indoor installation. It uses a BME680 air quality sensor and a PMS5003 particulate matter sensor. The controller is an Wemos D1 mini (ESP8266).
The sensor connects to a local WiFi network and publishes its measurements via MQTT – that's it.
Hardware and software might become more elaborated in future versions (e.g. WiFiManager configuration, display, …).
Wemos D1 mini: D1: I2C_SCL BME680 SCL D2: I2C_SDA BME680 SDA D4: Tx -> PMS5003 Rx (Pin 4) D5: Rx <- PMS5003 Tx (Pin 5) – all others not connected.
BME680: VCC(5V), GND, SCL, SDA, SDO(NC), CS(NC)
PMS5003: pin 1 = Vcc(5V), pin 2 = Gnd, pin 4 = Rx, pin 5 = Tx, other pins NC