https://github.com/phuurl/esp32-greengrass-temperature-sensor

ESP32 project to publish the current temperature and humidity (from a DHT11 sensor) to AWS IoT via Greengrass
https://github.com/phuurl/esp32-greengrass-temperature-sensor

Last synced: 8 days ago
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ESP32 project to publish the current temperature and humidity (from a DHT11 sensor) to AWS IoT via Greengrass

• Host: GitHub
• URL: https://github.com/phuurl/esp32-greengrass-temperature-sensor
• Owner: Phuurl
• License: apache-2.0
• Created: 2020-08-30T14:51:27.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-08-30T14:54:00.000Z (over 4 years ago)
• Last Synced: 2024-12-29T16:46:08.307Z (12 days ago)
• Language: C
• Homepage:
• Size: 8.79 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# esp32-greengrass-temperature-sensor

ESP32 project to publish the current temperature and humidity (from a DHT11 sensor) to AWS IoT via Greengrass.

This can then be streamed to a DynamoDB table via IoT rules, and entries automatically aged off using the `TTL` field in the payload.

## Payload

The ESP32 will send the following payload to Greengrass:

```json

{

  "DeviceID": "ESP32-temperature",

  "timestamp": 1598798739,

  "tempC": 25.6,

  "Humid": 30,

  "TTL": 1599057939

}

```

- `DeviceID` - the device ID as configured in AWS and `config.h`

- `timestamp` - epoch timestamp of the message

- `tempC` - reported temperature (°C) from the DHT11

- `Humid` - reported % humidity from the DHT11

- `TTL` - epoch TTL timestamp for use with DynamoDB TTL

## Usage

1. Clone the repo.

2. Follow the initial setup instructions at https://github.com/aws-samples/arduino-aws-greengrass-iot. You will need to have setup the libraries, created a Greengrass group, deployed a Core that is accessible from the network that the ESP32 will connect to, and created a Device for the ESP32.

3. Copy and modify the example config files to the root of the project.

   ```bash

   cp config-examples/* ./

   mv aws_certificates-example.c aws_certificates.c

   nano aws_certificates.c

   mv config-example.h config.h

   nano config.h

   ```

4. Connect your DHT11 sensor to your ESP32. Note that if you are using pin #12 for data, you will need to disconnect it during program upload to avoid communication errors.

5. Compile and deploy to the ESP32 via the Arduino IDE.

## Acknowledgements

This project is heavily based in the sample ESP32 Greengrass publish example [by AWS](https://github.com/aws-samples/arduino-aws-greengrass-iot/tree/master/examples/gg_temp_humid_pub_sub), and uses the Arduino AWSGreengrassIoT Library. See [NOTICE](./NOTICE) for copyright information.