We Power Connected ThingsHardware development at the speed of software. www.wildernesslabs.co

Bryan Costanich@bryancostanich

- The dream of connected things- Controlling household electricity with a

relay- Exposing control via a web API- Connecting to that Web API from a

Xamarin App

Building a Netduino Powered Connected Coffee Maker

Wilderness Labs

Relaunched Netduino in March.

Added Mac support.

Netduino stock at Amazon.com and Mouser.com (international).

Building a vNext connected things platform.

Actively working on Netduino.

developer.wildernesslabs.co

community.wildernesslabs.co

Connected Coffee Maker Solution

Power ControlHousehold electricity (110V/240V) is

controlled by a relay.

Relays are electromechanical and isolate

circuits.

Controlled by a simple on/off via a digital

I/O pin.

Design @ 3D_Print_Designs repo

Assembly instructions in blog.

OutputPort relay =

new OutputPort(Pins.GPIO_PIN_D2, false);

relay.Write(true);

Web Server

Purpose-built for Netduino.

Modern, RESTful Web API/

Built-in JSON Support.

Maple Web Server Hostpublic class RequestHandler : RequestHandlerBase {

private static bool _isPowerOn;

public void getStatus() { StatusResponse(); }

public void postTurnOn() { TogglePower(true); StatusResponse(); }

public void postTurnOff() { TogglePower(false); StatusResponse(); }

private void TogglePower(bool val) {

_isPowerOn = val;

Ports.ONBOARD_LED.Write(val);

Ports.GPIO_PIN_D1.Write(val);

}

private void StatusResponse() {

this.Context.Response.ContentType = "application/json";

this.Context.Response.StatusCode = 200;

Hashtable result = new Hashtable { { "isPowerOn", _isPowerOn.ToString().ToLower() } };

this.Send(result);

}

}

get:/Statuspost:/TurnOnpost:/TurnOff

Xamarin Mobile App

Xamarin.Forms + HttpClient

async private Task<bool> PowerCommand(string command) {

HttpClient client = new HttpClient();

client.BaseAddress = new Uri("http://" + _hostAddress + "/" + _apiBase);

var response = await client.PostAsync(command, null);

if (response.IsSuccessStatusCode) {

if (command == "turnon") {

App.ApplianceStatus = ApplianceStatus.On;

} else {

App.ApplianceStatus = ApplianceStatus.Off;

}

}

return response.IsSuccessStatusCode;

}

Possible Expansion Projects

On timer.

Feedback loop for heat control w/temp sensor; what temp do

you like your coffee?

Coffee done push notification.

Scheduler.

Thanks.

www.wildernesslabs.co

slideshare.net/bryancostanichCode hereGithub.com/WildernessLabs/Netduino_Samples/Connected_Coffee_Maker