Smart - Coffee: ESP32 version - Programmable Espresso Machine Controller

Smart-Coffee related

Last Post by Schematix 11 months ago

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Schematix

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[#10]

Purchase a kit from the Schematix Store: Click here

Programming and wiring guides:

Download the programming guide: click here

Download the wiring guide: click here

Specifications of the Smart Coffee board:

Power in: 100~240VAC

On board DC power supply: 5VDC, 2A

On board 3.3V power supply: 1A

On board, Solid-Sate relays 100~240VAC live outputs:

2x Boiler element (10A)

1x Pump (10A)

2x Programmable relays (usually connected to solenoid valves) (1A)

Total combined output current limit from relays: 20A

Element 1, and Pump combined max current: 10A

Element 2, RLY1, and RL2 combined max current: 10A

7x 5VDC relay control outputs: (used to control external relays for high current loads)

2x Boiler element

1x Pump

4x Programable relays

Fuse:

2x 5x20mm, 10A

ESP32:

Model: 30pin Development Board

Quantity required: 2

Purchasing link: https://s.click.aliexpress.com/e/_DFc08KN

Inputs/Outputs:

4/6 wire Load Cell Input
I2C display screen interface
2x Pressure transducer inputs
2x Boiler water level detection probes
Brew Switch input
Espresso mode selection input
Reservoir water level detection options:

Reservoir touch-sensitive probe (for detecting water)

Reservoir float switch (compatible with NO and NC switches)

Ultrasonic water level detection

Ultrasonic distance sensor (for measuring water level inside a reservoir tank)
2x MAX31865 temperature sensors (compatible with 2, 3, and 4 wire probes. PT100 and PT1000 series compatible)
6x User programable GPIO pins (M1, M2, S1, S2, S3, and PT3) write your own code to make use of these pins to really customize your coffee experience
7x 5VDC relay control outputs: (used to control external relays for high current loads)
2x Boiler element
1x Pump
4x Programable relays

Smart Coffee Software Features:

Single and Dual boiler compatible with a single group head
PID and PWM logic boiler control
Boiler target can be programmed as Temperature or Pressure
Boiler water level probes (used to trigger a refill when required)
Display metric units (kPa, Celsius, grams, mls) or imperial units (PSI, Fahrenheit, Ounces, fluid ounces)
Pre-Infusion cycle for every coffee extraction (3 stages consisting of: Prime the system > Cycle pump on/off > Extract coffee until the programmed amount has been dispensed)
Momentary or latching switch compatible for Brew and Espresso mode switches
Pressure transducer inputs to control/monitor pressure
Programmable pressure safety limits (machines shuts down when safety limits are exceeded)
Thermocouple temperature sensors to monitor any temperature on the machine
Programmable pressure safety limits (machines shuts down when safety limits are exceeded)
Espresso shot output (when espresso mode is activated by the user)

- Espresso shot timer
- Espresso shot by weight target (requires loadcell)
- Espresso shot by volume target (requires flow meter)

Pause boiler refill (pauses a boiler refill if an espresso extraction is currently taking place)
Ultrasonic distance sensor (used for machines with a reservoir tank to measure the water level)
Reservoir empty standby mode (prevents the machine from operating until the reservoir is refilled)