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- General DiscussionHi! I found this project to be really exciting! Curious about the suitability of using the latest smart coffee gear on an espresso machine with a Rotary pump - any thoughts, experiences or recommendations? Contrary to a vibration pump, Rotary pumps require quite some energy to get started, and therefore might not be suitable for any pressure profiling, unless doing it steplessly, regulating rpms, or...? (It's a 10+ years Rocket Cellini Evoluzione R)Like
- How To'sPurchase a kit from the Schematix Store: Click here Index: Specifications Inputs/Outputs Smart Coffee Software Features Programming and Wiring guides Purchase Sensors and Hardware Bug reporting and suggestions Updates for Smart Coffee PCB dimensions 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) Programming and wiring guides: Download the programming guide: click here Download the wiring guide: click here Purchase Sensors and Hardware: ESP32: Model: 30pin Development Board Quantity required: 2 Purchasing link: https://s.click.aliexpress.com/e/_DFc08KN Pressure transducer: Max voltage input from pressure transducer: 5V Recommended signal range: 0.5 to 4.5V Recommended pressure rating: 200 kPa (0.2mPa) (pressure rating should be at minimum 20% higher than your running pressure) Purchasing link: https://s.click.aliexpress.com/e/_DkQsvxd Optional G1/4 to 1/4BSP thread adapter (select type 2): https://s.click.aliexpress.com/e/_DdueKDl Right angle adapter: https://s.click.aliexpress.com/e/_DE8J34X Display screen: Model: OLED SH1107 Interface: I2C Pixels: 128x128 Input power: 5V Purchasing link: https://s.click.aliexpress.com/e/_DlH1C43 Load cell: Weight rating: 1kg Wiring: 4wire Purchasing link: https://s.click.aliexpress.com/e/_DdDwihl 4 Pin pogo connector: Purchasing link: https://s.click.aliexpress.com/e/_DB2fN7N Small size flow meter: Model: USN-HS06P Voltage: 5V Barb Size: 5mm OD Flow range: 30 ~ 150ml/min Purchasing link: https://s.click.aliexpress.com/e/_DCCjQh5 Medium-size flow meter: Model: USN-HS06PS Voltage: 5V Barb size: 7mm OD Flow range: 0.1 ~ 1.5L/min Purchasing link: https://s.click.aliexpress.com/e/_DFVTRbV High-pressure Gicar flow meter: Purchasing link: https://s.click.aliexpress.com/e/_Dlr1vgB Thermocouple: Compatible wiring: 2/3/4 wire Type: PT100 and PT1000 compatible Purchasing link for screw mount type: https://s.click.aliexpress.com/e/_DkV2nuB Purchasing link for threaded mount type: https://s.click.aliexpress.com/e/_DD0nYYx Ultrasonic Distance Sensor: Model: A02YY Output signal: PWM Input: 5V Purchasing link: https://s.click.aliexpress.com/e/_DFYOL3z Switches: Chrome LED lit momentary switch: https://s.click.aliexpress.com/e/_Dd0BleB (can be used for the brew and espresso mode switches) USB panel mount connector: Purchasing link: https://s.click.aliexpress.com/e/_DksmHhh Shielded multi-core cable: 28AWG, 2meter Purchasing link: https://s.click.aliexpress.com/e/_DkdDW87 M3 Brass standoff: These are handy for mounting the PCB Purchasing link: https://s.click.aliexpress.com/e/_Dn3mUKB Bug reporting and suggestions: If you happen to find a bug in the software. Please send an email describing your software configuration, the sensors you are using, and the bug you have encountered to mail@schematix.co.nz Updates for Smart Coffee: Change log and updates: V1.0 Base version published PCB Dimensions: Width: 101mm (3.97") Length: 153mm (6.02") Mounting hole spacing: 145mm (5.7") x 93mm (3.66") Mounting hole size: 3.7mmLike
- General DiscussionHi I'm very excited for the dual boiler version coming out, I'm just curious to when you thi know it will be available? Thanks in advanceLike
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