In this tutorial, we will measure different temperature and humidity data using Temp and humidity sensor. You will also learn how to send this data to AWS.
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- Arduino IDE
- AWS IoT
- PubSubClient Library
- Download and include the PubSubClient Library and Wire.h Library.
- Download the Zip file of AWS_IoT, from the given link and after extracting, paste the library in your Arduino library folder.
- You can get the Arduino code here.
- You must assign your unique AWS MQTT_TOPIC, AWS_HOST, SSID (WiFi Name) and Password of the available network.
- MQTT topic and AWS HOST can get inside Things-Interact at AWS-IoT console.
- Compile and upload the ESP32_AWS.ino code.
- Before uploading the code add certificate inside AWS_IOT folder to aws_iot_certficates.c, which is done in further steps.
- To verify the connectivity of the device and the data sent, open the serial monitor. If no response is seen, try unplugging your ESP32 and then plugging it again. Make sure the baud rate of the Serial monitor is set to the same one specified in your code 115200.
Create Thing and Certificate
- THING: It is virtual representation od your device.
- CERTIFICATE: Authenticates the identity of a THING.
- Open AWS-IoT
- Click on manage -THING -Register THING.
- Click on create a single thing.
- Give the Thing name and type.
- Click on next.
- Now your certificate page will open, click on Create Certificate.
- Download these Certificates, mainly private key, a certificate for this thing and root_ca and keep them in a separate folder.
- Inside root_ca certificate click on Amazon root CA1-Copy it-Paste it to notepad and save it as a root_ca.txt file in your certificate folder.
It defines which operation a device or user can access.
- Go to AWS-IoT interface, Click on Secure-Policies.
- Click on Create.
- Fill all the necessary details such as policy name, Click Create.
- Now go back to AWS-IoT interface, Click on Secure-Certificates and attach the policy created just now to it.
Add Private key, Certificate and root_CA to Code
- Open your downloaded certificate in your text editor(Notepad++), mainly private key, root_CA and certificate of thing and edit them as the format of aws_iot_certficates.c inside AWS_IOT folder.
- Now open your AWS_IoT folder in your Arduino library -My Document. Go to C:\Users \xyz\Documents\Arduino\libraries\AWS_IOT\src, click on aws_iot_certficates.c, open it on an editor and paste all the edited certificate their at the required place, save it.
- Go to test in AWS_IoT console.
- Fill your MQTT topic to Subscription topic in your test credential.
- Now you can view your temp and humidity data.
You set up Amazon Simple Notification Service (Amazon SNS) for creating mail alert to receivers address for different temperature and humidity readings.
- Go to AWS IoT console -Click on Act.
- Don't have any rule -Click on create a rule.
- On this page Name the rule i.e AlertTempEsp32, also provide the description(Creating mail alert of Temp and Humidity sensors data).
- Now create Rule Query Statement(SQL statement for processing data from source).In this the statement used is
- $aws/things/Temp_Humidity_esp32/shadow/update, Go to AWS IoT Console -Manage-Thing-Click on your created Thing -Interact.
- To choose an action Click on ADD Action.
- Select send a message as an SNS push notification.
- Now Configure Action selected.for SNS target-choose Create. Enter a name for the SNS topic, such as Temp_Humidity_Esp32Topic.Message Format -Raw. Create role -Temp_Humidity_Esp32TopicRole.
- Add Action.
- Create a rule.
- Create Amazon SNS to send the messages through your Amazon SNS topic to your email inbox. Click on Services.
- Search SNS. Click on SNS.
- In Amazon SNS -Click on Subscription. Select topic ARN.Protocol-Email -Give your email Address on which alert to be sent.
- Now click on Create Subscription.
- After clicking the Create Subscription. You have to confirm Subscription by clicking on the mail, that is sent to your registered mail ID.
- Confirm Subscription link.