DIY SCADA / smart home

I never wanted to control the door lock via my smart-home system. 
It always seemed too risky. 

So I added the capability to only monitor the state of the front door (open/closed) and the lock of the door (locked/unlocked). 

The door state is monitored with a magnet and reed switch combination, the lock via an inductive proximity switch on the frame.

The states are captured with my Arduino remote I/O 

(https://hackaday.io/project/167904-diy-scada-wireless-remote-io)
and sent to the software PLC. 

The inductive proximity switch can sense the latch through the wood of the door frame.  

A 3d-printed part and hot glue hold it in place.(no drilling required)

Level 0: field devices
Sensors: DHT11, DHT22, BH1750, HC-SR501, DS18B20
Actors: stepper and DC motors, solenoid valves, radio controlled plugs and relays (433Mhz), IR-remote controlled devices

Level 1: I/O modules
Remote input/output (RIO) modules made from Arduino's which sends the sensor data to the CodeSys software PLC and directly controls critical functions (as feeding the cats, positioning roller blinds).
Additionally a Pixtend I/O Board is connected to a Raspberry PI.

Level 2: supervisory 
A Raspberry PI with CodeSys software PLC and graphical HMI which controls 

Level 3/4: coordinating
A Raspberry PI With Node-RED and Grafana to collect and store all my data. And Alexa voice control.

(What I mean with Remote I/Os: https://en.wikipedia.org/wiki/Remote_terminal_unit)

(Remote I/Os in my Projekt: hackaday.io/.../167904-diy-scada-wireless-remote-io)

The simplest function of the system is also one of my favorites. It automatically refills the water tank of my coffee maker. All it needs is a float switch and a solenoid valve that lets fresh tap water flow in the tank.

Thanks to the SCADA like the design of my smart home system it is easy to derive the water usage from the time the valve was open (@ Level 3/4: A Raspberry PI With Node-RED and Grafana). 

Every step up on the following graph represents a refill of the tank.

Don't worry there are some safety functions implemented in Level 2: (A Raspberry PI with CodeSys software PLC ) of the system. Such as maximum filling time or only refill when someone is at home.

And it is possible to trace all actions within Grafana:

Finally, after 3 years I installed the last 433MHz receiver / remote switch.

Since I recently got a 3D-printer I made a simple case for it.