Temperature Pi

Temperature logger platform with Raspberry Pi + Amazon Web Services.

It measures room temperature and CPU core temperature of Raspberry Pi, and sends them to AWS. Saved records can be displayed graphically from your browser.

TEMPer is used to record room temperature. This is a device that can be connected by USB. Please refer to temper/README.md for more details.

Topology

                               +------------------------------------------+
                               |            Amazon Web Services           |
+----------------+             |                                          |            +----------------+
|                |    HTTPS    |   +-------------+                        |   HTTPS    |                |
|  Raspberry Pi  +-----------------> API Gateway +------------------------------------->    Browser     |
|                | (JSON/POST) |   +-----+-+-----+                        | (JSON/XHR) |                |
+-------+--------+             |         | ^                              |            +--------+-------+
        |                      |         v |                              |                     ^
        |                      |   +-----+-+-----+      +-------------+   |                     |   HTTPS
    +---+----+                 |   |   Lambda    |      | CloudFront  +-------------------------+ (HTML/GET)
    | TEMPer |                 |   +-----+-+-----+      +------+------+   |                     |
    +--------+                 |         | ^                   ^          |                     |
                               |         v |                   |          |      or             |
                               |   +-----+-+-----+      +------+------+   |                     |
                               |   |  DynamoDB   |      |     S3      +-------------------------+
                               |   +-------------+      +-------------+   |
                               |                                          |
                               +------------------------------------------+

Note: Currently, API Gateway has a functionality (AWS Service Proxy) to store the record to DynamoDB directly without Lambda.

DynamoDB scheme

Device	Timestamp	Air	Core
String	Number	Number	Number
Primary partition key	Primary sort key
Name of device	Measured time in UNIX timestamp	Temperature of the room	Temperature of CPU core

Files

record.rb

Get temperature and send them to AWS. This script must be run periodically on Raspberry Pi.

You have to set up some variables to use this script:

• API key for API Gateway : L4
• API endpoint : L5
• Table name of DynamoDB : L18
• Device name : L20

debug.rb

Simple front-end tester for API Gateway and Lambda function.

You have to set up some variables to use this script:

• API key for API Gateway : L4
• API endpoint : L5
• Table name of DynamoDB : L10
• Device name : L17

s3/index.html

Draw chart of logged temperature. It gets records by XHR from the endpoint of API Gateway.

You can distribute this file both directly from S3 and through CloudFront.

An endpoint URI must be set on L43 and a device name on L49.

lambda/get.js

Retrieve the records from DynamoDB. To avoid change the data, some operations which cause a side-effect are removed from lambda/post.js.

It intends to allow open access to this Lambda function with API Gateway.

An table name of DynamoDB must be set on L10.

lambda/post.js

Store the data which sent from Raspberry Pi to DynamoDB. This file is the one provided as "blueprint" by AWS. (It is licensed under CC0.)

The API key should be required to call this Lambda function from API Gateway.

conf/*

3G/LTE configuration files for Arch Linux installed on Raspberry Pi.