In this section, we will focus on EVA configuration which is illustrated by the following example.
There is a room and some equipment:
- Internal ventilation system, powered via SR-201 controlled relay, port 1
- External ventilation system, powered via SR-201 controlled relay, port 2
- Air temperature sensor Dallas DS18S20
- a motion sensor in the hall connected to AKCP SensorProbe
- a light in the hall connected to Denkovi SmartDEN IP-16R, port 2
- and some alarm system installed on a remote server and called by its own API (via GET request). As soon as the alarm is activated, it switches on the alarm siren and sends an SMS to the operator.
Our task is to automate the above:
- To switch on the internal ventilation every night for the period from 9pm till 7am.
- To switch on ventilation in the daytime, if the air temperature is above 25 degrees for more than 5 minutes in a row.
- If the sensor detects a motion, do the following:
- if the alarm is on - send an API request to the alarm system
- if the alarm is off - turn on the light in the hall
- The user should be able to control the ventilation system with web interface, see the temperature, manage alarm and lighting
Let’s do this step by step, from equipment configuration to interface development. Let’s Suppose that EVA has already been installed and everything is located on a single server, including MQTT server with eva:secret access and all the data will be sent into plant1 subject.
EVA bin folder is included in system PATH.
All operations will be done using command line applications.