4 layers161 × 100 mm
2 layers80 × 80 mm
Espresso controller firmware for an E61-grouphead style espresso machine
- Size
- 80 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 74
- Nets
- 67
- Pads
- 225
- Tracks, vias
- 601, 74
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 May 2023
- Updated
- 27 Jan 2026
Overview
Lupa is an open-source printed circuit board by jorticus, from the jorticus/lupa-espresso repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 80 × 80 mm with 74 parts on 67 nets, routed with 601 tracks and 74 vias.
It is built around the ESP32-WROOM-32U, MAX31865AAP+ and AQH1213A. Its parts include 23 connectors, 21 resistors, 13 capacitors, 4 ICs and 2 inductors. It belongs with the ESP32 boards of this library.
Main components
3
ESP32-WROOM-32U
SMD,19.2x18mm-40℃~+85℃ -97dBm 2.4GHz 20.5dBm 3V~3.6V Bluetooth4.2 ESP32-DOWD UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC、CAN SMD,19.2x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
MAX31865AAP+
SSOP-20-40℃~+125℃ 1 1.5mA 15 1LSB 3V~3.6V Digital filtering SPI Sensor Conditioner Sigma-Delta SSOP-20 ADCs/DACs - Special Purpose ROHSMaxim Integrated (Analog Devices)Temperature Sensors
AQH1213A
SMD-7P-30℃~+85℃ 0.2V/ns 0V~600V 1 Form A (SPST-NO) 1.3V 25mA 50mA 600V 600mA 6A AC Yes SMD-7P Solid State Relays (Triac Output) ROHSPanasonicSolid State Relays (Triac Output)
README
README.mdLUPA ESPRESSO
ESP32 firmware for controlling my modified Vibiemme Domobar Junior, which is an E61-grouphead Heat Exchanger (HX) espresso machine.
The main goal is to add some smarts, but retain the manual control and analog feel.
NOTE: This project is not intended to be re-used on other machines as it is highly specific to the particular modifications I have made.
Features
- PID control of heater boiler
- Automatic brew timer
- Digital pressure / temperature / flow readouts
- Graphing and gauges displayed on two round TFT displays
- Grouphead temperature approximation
- Preheat/sleep states
- Remote control
- HomeAssistant integration
Modifications
- Analog pressure dials replaced with round TFT displays
- Digital pressure transducer
- Water flow sensor
- Platinum PT100 thermocouple probe
- Boiler SSR controlled by ESP32
Parts
74| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R5, R6, R7, R17, R18, R26 |
| 6 | 1k | Resistor_SMD:R_0603_1608Metric | R2, R3, R4, R13, R14, R15 |
| 5 | 100R | Resistor_SMD:R_0603_1608Metric | R8, R9, R10, R11, R12 |
| 5 | 10n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5 |
| 5 | Screw_Terminal_01x01 | Visclib:TAB_TERMINAL | J15, J20, J21, J22, J23 |
| 4 | DrillHoleE | MountingHole:MountingHole_3.2mm_M3_Pad | DRL1, DRL2, DRL3, DRL4 |
| 2 | 10nF | Resistor_SMD:R_0805_2012Metric | C6, C7 |
| 2 | 39 | Resistor_SMD:R_0805_2012Metric | R22, R23 |
| 2 | AQH1213A | Package_SO:SSO-7-8_6.4x9.78mm_P2.54mm | U3, U4 |
| 1 | 100nF X2 | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C12 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C13 |
| 1 | 10R | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 10uF 450V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C14 |
| 1 | 12R 3W | Resistor_THT:R_Axial_DIN0516_L15.5mm_D5.0mm_P5.08mm_Vertical | R16 |
| 1 | 1A 250V | Fuse:Fuse_Schurter_UMZ250 | F1 |
| 1 | 1nF 400V Y | Capacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm | C10 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | 4.7mH | Inductor_THT:L_Radial_D6.0mm_P4.00mm | L1 |
| 1 | 4.7uH 2.2A | Inductor_SMD:L_6.3x6.3_H3 | L2 |
| 1 | 820uF 6.3V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C8 |
| 1 | BOILER_SSR | Connector_JST:JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J14 |
| 1 | ESP32-WROOM-32U | RF_Module:ESP32-WROOM-32U | U1 |
| 1 | FLOW1 | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J4 |
| 1 | FLOW2 | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J5 |
| 1 | Ferrite | Resistor_SMD:R_0603_1608Metric | FB1 |
| 1 | Fill Solenoid | TerminalBlock_Altech:Altech_AK300_1x02_P5.00mm_45-Degree | J17 |
| 1 | LCD_L | Connector_JST:JST_XH_B8B-XH-A_1x08_P2.50mm_Vertical | J8 |
| 1 | LCD_R | Connector_JST:JST_XH_B8B-XH-A_1x08_P2.50mm_Vertical | J9 |
| 1 | LED_PWR | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J10 |
| 1 | LEVER | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J1 |
| 1 | LOW_WATER | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J3 |
| 1 | MAX31865 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J11 |
| 1 | MOV | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | RV1 |
| 1 | Mains | TerminalBlock_Altech:Altech_AK300_1x03_P5.00mm_45-Degree | J16 |
| 1 | NetTie_2 | NetTie:NetTie-2_SMD_Pad2.0mm | NT1 |
| 1 | POWER | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J12 |
| 1 | POWER_BTN | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J2 |
| 1 | PRESSURE1 | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J6 |
| 1 | PRESSURE2 | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J7 |
| 1 | PROG | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical_SMD_Pin1Left | J13 |
| 1 | Pump | TerminalBlock_Altech:Altech_AK300_1x02_P5.00mm_45-Degree | J18 |
| 1 | SMBJ7A | Diode_SMD:D_SMB | D1 |
| 1 | VTX-215-005-003 | Visclib:SMPS-VTX-215-005-003 | U2 |
| 1 | Water Level | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J19 |
| 1 | Wolf | Visclib:wolfpaw-0.3 | LOGO2 |
Questions
How big is the Lupa PCB?
It measures 80 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lupa use?
74 parts, built around the ESP32-WROOM-32U, MAX31865AAP+ and AQH1213A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Lupa KiCad files?
From the jorticus/lupa-espresso repository on GitHub, at the commit this page was made from: the board is hardware/lupa.kicad_pcb and its schematic hardware/lupa.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lupa design in my own project?
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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