aws_iot_smarthome_multinode

AWS IoT Smarthome Application

This application is designed to show how to connect 3 EMSKs and AWS IoT Cloud using embARC. The connection between EMSK and AWS IoT Cloud is secured by TLS.

Hardware and Software Setup

Required Hardware

• 3 DesignWare ARC EM Starter Kit(EMSK)
• 3 Digilent PMOD WiFi(MRF24WG0MA)
• 1 Digilent PMOD TMP2
• 3 SD Card
• WiFi Hotspot(SSID:embARC, Password:qazwsxedc, WPA/WPA2 encypted)

Required Software

• Metaware or ARC GNU Toolset
• Serial port terminal, such as putty, tera-term or minicom

Hardware Connection

1. EMSK 1 simulate frontdoor node, it will publish frontdoor lock status and temperature sensor value to AWS IoT Cloud.
   • Connect PMOD WiFi to J5, connect PMOD TMP2 to J2.
2. EMSK 2 simulate livingroom node, it will publish livingroom lights status to AWS IoT Cloud.
   • Connect PMOD WiFi to J5.
3. EMSK 2 simulate kitchen node, it will publish kitchen lights status to AWS IoT Cloud.
   • Connect PMOD WiFi to J5.
4. Configure your EMSKs with proper core configuration.

User Manual

Before running this application

Similiar to the AWS IoT Smarthome Application - Single Node, you need to create 3 different things for different EMSK nodes and generate the certs for different nodes, and modify specific aws_iot_config.h for different nodes.

EMSK Simulated Node	AWS IoT Thing	Source Folder	Cert Folder
frontdoor	frontdoor	src/frontDoor	src/cert/frontdoor
kitchen	kitchen	src/kitchen	src/cert/kitchen
livingroom	livingRoom	src/livingRoom	src/cert/livingRoom

Copy src/cert/ folder to root folder of the EMSK SD card, in SD card, the cert folder should be cert/.

The hardware resources are allocated as following table.

Hardware Resource	Represent
BUTTON R	Livingroom Lights Control
LED 0-1	Livingroom Lights Status(On or Off)
BUTTON L	Kitchen Lights Control
LED 2-3	Kitchen Lights Status(On or Off)
BUTTON X	Front Door Lock Control
LED 4-5	Front Door Lock Status(On or Off)
LED 7	WiFi connection status(On for connected, Off for not)
LED X	Node working status(toggling in 2s period if working well)
PMOD TMP2	Temperature Sensor
PMOD WiFi	Provide WiFi Connection

EMSK can send the status of the Room Temperature, FrontDoor Lock status, LivingRoom Light status and Kitchen Light status to the AWS IoT and interact with AWS IoT Cloud with using embARC.

Open dashboard website, and load dashboard-smarthome-multithings.json dashboard configuration file in current folder, and then you can control and monitor this multiple nodes.

After loading this configuration file, you also need to click at the setting icon, and then click on the aws datasource, and then change the AWS IOT ENDPOINT, REGION, ACCESS KEY, SECRET KEY to your own aws ones.

Run this application

Here take EMSK2.2 - ARC EM7D with Metaware Toolset for example to show how to run this application.

1. We need to use embARC 2nd bootloader to automatically load application binary for different EMSK and run.

2. Open your serial terminal such as Tera-Term on PC, and configure it to right COM port and 115200bps.

3. Interact using EMSK and Dashboard.

• You can press the button L/R/X on specific board to see the led changes on board and also on dashboard web app.
• You can also click the lights of DESIRED STATUS pane on the dashboard app, and see the led changes on board and dashboard web app.