ESP32 AWS IoT sensor

This project uses an ESP32 to publish temperature, pressure and humidity to AWS IoT via MQTT.

Hardware

• ESP32 Dev kit
• BME280 sensor
• SDS011 sensor

Wiring

BME280

ESP32 pins	BME280 pins
3V3	VCC
GND	GND
G22 (IC2 SCL)	SCL
G21 (IC2 SDA)	SDA

SDS011

ESP32 pins	SDS011 pins
5V	5V
GND	GND
G16 (RX2)	RX
G17 (TX2)	TX

Setup

1. Create a thing with certificate and policy in AWS IoT
2. Install PlatformIO for VSCode
3. Open device project in VSCode
4. Copy device/include/secrets.h.template to device/include/secrets.h and insert the following:
   • THINGNAME: choose a name for your device
   • WIFI_SSID: name of your Wifi network
   • WIFI_PASSWORD: password for your Wifi network
   • AWS_IOT_ENDPOINT: get it from AWS IoT settings
   • AWS_CERT_CA: get it from https://www.amazontrust.com/repository/AmazonRootCA1.pem
   • AWS_CERT_CRT: device certificate
   • AWS_CERT_PRIVATE: private key from device certificate
5. Build and upload with PlatformIO
6. Verify that messages are published to AWS IoT

Example message

{
  "time": 669776,
  "temperature": 21.83,
  "humidity": 36.62695,
  "pressure": 997.652,
  "altitude": 130.6805,
  "hall": 4,
  "sds_p10": 19.2,
  "sds_p25": 13.8
}