IoT-Pill-Dispenser

Firware for the AVR-IoT WA Development Board based on the original example

Main Features

Custom CLI

The already implemented CLI have been extended including the command "pill" , its corresponding callback pill_command() that parses the message and sends th confirmation JSON by MQTT to the topic "confirmationpill". Also, the message in case of unknown message is customized as well as in the callback in case of incorrect parameter.

CLI USART moved

The original CLI used the USART2, which is connected to the debugger by the PCB but is not accessible. For this version, the CLI structure and the funtionality printf() are now implemented on the USART1, which is avaliable with the pin conectors RX and TX. This alows us to use this CLI with any external device, taking into account the following configuration:

Baud Rate	Data	Parity bit	Stop bit	Flow control	Transmit protocol
9600	8 bits	None	1 bit	None	CR+LF (Carriage Return + Line Feed)

Custom MQTT topics subcription with JSON parser

On the aplication_manager.c could be found the modified version of subscribeToCloud() to subscribe to "dispensepill" custom topic and how it is linked to a custom callback receiveddispenseFromCloud() in which the data from the JSON is extracted.

IoTPill.h

On this header are defined the main structures used to control the data recieved and sended.

Comunication Protocol

AWS → IoT Board → Arduino

The well services will trigger AWS to send by MQTT to IoT Board a JSON formated string that has this parts:

{
    "cmd": "dispensepill",
    "npills": 2,
    "intake": {
        "time": "morning"
    },
    "pills": {
        "1": {
            "pill": "Ibuprofeno",
            "qty": 1,
            "deposit": 1,
            "weight": 200
        },
        "2": {
            "pill": "Paracetamol",
            "qty": 2,
            "deposit": 2,
            "weight": 500
        }
    }
}

and the IoT board will send by USART to the Arduino:

D Ibuprofeno 1 1 200 D Paracetamol 2 2 500 \n

Arduino → IoT Board → AWS

The arduino will send to the command "pill " and if it was incorrect or correct the delivery by adding a "1" if is okey:

pill 1

This message will be processed by the IoT Board taking into acount the intake send and will send the following JSON to AWS

{
   "time":"morning",
   "state": "ok"
}

AWS will send the log with Lambda funtions trigered to the Web service