Revision as of 10:14, 9 April 2018

In the earlier tutorial we discussed how to setup AWS IOT for an Amazon user account. Now lets see how to use the Arduino esp32 AWS IOT library to communicate with AWS server.

AWS IOT for ESP32

Download the AWS IOT library for Arduino ESP32 from this link.
Now open the first example pubSubTest.ino as shown below. .

Wifi SSID and Host Address Configuration

Configure the below parameters at the beginning of the sketch as shown in the image.
WIFI_SSID
WIFI_PASSWORD
HOST_ADDRESS
CLIENT_ID
TOPIC_NAME

AWS Certificate Configuration

The below certificate and private key needs to be copied to aws_iot_certificate.c file in the form of array.

aws-root-ca.pem
certificate.pem.crt
private.pem.key 

Upload the sketch and verify the output

Publish and subscribe(received) messages printed on terminal.

Published message viewed on MQTT Fx client software:

Publish a message from MQTT Fx Client and verify the received message on terminal.

Logging Temperature and Humidity using DHT11 sensor

After setting the AWS client and AWS IOT lib, lets log the real time temperature and humidity using DHT11 sensor.
Install the Adafruit DHT11 sensor library using Arduino Library Manager or download it from this link.

Do the connection as shown below.

Now copy paste the below code and configure the Wifi SSID, Host Address and upload the sketch.

Temp and Humidity logged to AWS IOT server.

Download

Download the Arduino ESP32 AWS IOT lib and examples form this link.

Have an opinion, suggestion , question or feedback about the article let it out here!