Have fun with workflows

Soil moisture

To measure to soil moisture, the Sensor delivers an electrical voltage representing the moisture. This value is calibrated for water and air and a value for the dryness is calculated.

Dryness d	Description
0 <= d <= 9	saturated
9 < d <= 19	adequately wet
19 < d <= 59	irrigation advice
59 < d <= 99	irrigation
99 < d <= 100	dangerously dry

Mailbox

The mailbox is based on this Adafruit project.

Pump

A 5V pump is used for irrigation.

Workflow

The three devices are connected and controlled by a business workflow.

Read soil moisture

var httpConnector = org.camunda.connect.Connectors.http(); 
var system = java.lang.System;

var resp = httpConnector.createRequest()
                                        .get()
                                        .url("http://192.168.0.40/soilmoisture")
                                        .execute();

var result = JSON.parse(resp.getResponse());
resp.close();

system.err.print("dryness: ");
system.err.println(parseInt(result.value, 10));

system.err.print("description: ");
system.err.println(result.description);

execution.setVariable('dryness', parseInt(result.value, 10));
execution.setVariable('description', result.description);

Flag up

var payload = { status : true };

var httpConnector = org.camunda.connect.Connectors.http(); 
var resp = httpConnector.createRequest()
                                        .put()
                                        .url("http://192.168.0.95/flag")
                                        .contentType("application/json")
                                        .payload(JSON.stringify(payload ))
                                        .execute();

var result = resp.getResponse();
resp.close();

Flag down

var payload = { status : false };

var httpConnector = org.camunda.connect.Connectors.http(); 
var resp = httpConnector.createRequest()
                                        .put()
                                        .url("http://192.168.0.95/flag")
                                        .contentType("application/json")
                                        .payload(JSON.stringify(payload ))
                                        .execute();

var result = resp.getResponse();
resp.close();

Pump

var payload = { duration : 1500 };

var httpConnector = org.camunda.connect.Connectors.http(); 
var resp = httpConnector.createRequest()
                                        .put()
                                        .url("http://192.168.0.40/pump")
                                        .contentType("application/json")
                                        .payload(JSON.stringify(payload ))
                                        .execute();

var result = resp.getResponse();
resp.close();