esp8266-saeco-intelia-mqtt

Control this Philips Saeco Intelia coffee maker with an ESP8266 and MQTT (via openHAB and Google Assistant).

Objective & inspiration

Integrate my Saeco coffee maker into openHAB to control it with MQTT and Google Assistant voice commands.

I wanted to be able to:

• Switch coffee maker on / off
• Read current status (on / off / ready / warning)
• Trigger espresso button
• Trigger large coffee button
• Trigger tea water button
• Communicate via MQTT for easy integration with openHAB

I was inspired by OpHaCo's smart coffee maker project and bntdumas's "Add WiFi to your coffee machine" tutorial but have a slightly different model and wanted to implement it in Arduino code, not LUA.

What you need

• Philips Saeco Intelia coffee maker
• ESP8266 (I use model E12 on the Wemos D1 Mini Lite breakout board)
• 2 x 1 kΩ resistor to read background led color of display
• 4 x 2N2222A transistor (1 for every button we want to trigger)
• 4 x 1 kΩ resistor (1 for every button we want to trigger)
• A prototype board, basic wire etc.

Building the board

Coffee machine control board (before wiring it up)

Prototype board (without ESP8266)

Prototype board inside coffee machine

What the code does

• Read current machine status (off / red / yellow / green)
• Press power, small / large coffee, tea water buttons
• Communicate status info to MQTT server
• Listen to MQTT server for commands

MQTT integration

Topic	Payload	Comment
stat/coffee_maker/STATUS	{"POWER":"ON", "STATUS":"GREEN"}	Published upon changes
stat/coffee_maker/LOG	String, e.g. "switching machine on"	Published upon events
cmnd/coffee_maker/PB4	ON, OFF	Power on/off
cmnd/coffee_maker/PB1	(none)	Make small coffee
cmnd/coffee_maker/PB2	(none)	Make large coffee
cmnd/coffee_maker/PB3	(none)	Make tea water

openHAB integration

I'm using the MQTT binding for openHAB.

Channels & items

When all channels are added and items created, your list of channels should look like this.

Label: Coffee maker status
MQTT state topic: stat/coffee_maker/STATUS
Incoming value transformation: JSONPATH:$.STATUS
Item type: String
Item id: CoffeeMaker_CoffeeMakerStatus

Label: On / Off
MQTT state topic: stat/coffee_maker/STATUS
MQTT command topic: cmnd/coffee_maker/PB4
Incoming value transformation: JSONPATH:$.POWER
Item type: Switch
Item id: CoffeeMaker_OnOff
Item meta data: Google Assistant > Coffee Maker

Label: Small coffee
MQTT state topic: stat/coffee_maker/STATUS
MQTT command topic: cmnd/coffee_maker/PB1
Incoming value transformation: JSONPATH:$.POWER
Item type: Switch
Item id: CoffeeMaker_SmallCoffee

Label: Large coffee
MQTT state topic: stat/coffee_maker/STATUS
MQTT command topic: cmnd/coffee_maker/PB2
Incoming value transformation: JSONPATH:$.POWER
Item type: Switch
Item id: CoffeeMaker_LargeCoffee

Label: Tea water
MQTT state topic: stat/coffee_maker/STATUS
MQTT command topic: cmnd/coffee_maker/PB3
Incoming value transformation: JSONPATH:$.POWER
Item type: Switch
Item id: CoffeeMaker_TeaWater

Label: Last log entry
MQTT state topic: stat/coffee_maker/LOG
Item type: String
Item id: CoffeeMaker_LastLogEntry

Sitemap

Switch item=CoffeeMaker_OnOff label="On / off" icon="switch"
Default item=CoffeeMaker_CoffeeMakerStatus label="Status" icon="rgb"
Default item=CoffeeMaker_LastLogEntry label="Last event" icon="text"
Switch item=CoffeeMaker_SmallCoffee label="Small coffee" icon="kitchen" mappings=[ON="Make"] visibility=[CoffeeMaker_CoffeeMakerStatus=="GREEN"]
Switch item=CoffeeMaker_LargeCoffee label="Large coffee" icon="kitchen" mappings=[ON="Make"] visibility=[CoffeeMaker_CoffeeMakerStatus=="GREEN"]      	
Switch item=CoffeeMaker_TeaWater label="Tea water" icon="kitchen" mappings=[ON="Make"] visibility=[CoffeeMaker_CoffeeMakerStatus=="GREEN"]

Google Assistant integration

• Expose items to openHAB cloud connector (Settings > openHAB cloud > Items to expose)

Option 1: Via IFTTT

• Create IFTTT applet
• If: Google Assistant / Say a simple phrase
• Then: openHAB / Send a command to item (Power [ON, OFF], Small coffee...)
• Your Google Assistant devices will now respond to the defined 'simple phrase'
• Advantage of IFTTT: You can simply add commands other than power on/off.

Option 2: Via OpenHAB

• Make sure the CoffeeMaker_Power item has Google Assistant Coffee_Maker tag assigned in openHAB
• In Google Home app, add openHAB account (say "talk to openHAB")
• (If you had already done the previous step: say "refresh devices")
• You will see a coffee maker icon popup
• Your Google Assistant devices will now understand "turn on/off coffee maker" commands (but nothing else)

What the code does not do / possible extensions

• Read specific display status messages (e.g. out of water, beans etc.)
• Skip decalcification warning
• Push cup under coffee outlet (and only after heat up flushing ;-))
• Coffee consumption statistics