COFFEE MAKER
About the COFFEE MAKER PCB
COFFEE MAKER is an open source ESP32 PCB design by liammchugh, published on GitHub. It is a 2-layer board measuring 131.4 × 99.7 mm, with 55 components from 35 distinct parts.
Its main chip is the ESP32-S2-SOLO-N4R2, from the ESP32 family. Other key parts include the OKI-78SR-3.3/1.5-W36H-C, OKI-78SR-5/1.5-W36-C, PCF8574ADWR, MAX31855KASA+T and LD1117S33CTR. By type, the board carries 14 capacitors, 12 resistors, 7 connectors, 6 ICs, 4 jumpers and 3 diodes.
Main components on the COFFEE MAKER
COFFEE MAKER bill of materials (BOM)
55 components, 35 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OKI-78SR-3.3/1.5-W36H-C OKI-78SR-3.3_1.5-W36H-C | Converter_DCDC_Murata_OKI-78SR_Horizontal | U1 |
| 1 | OKI-78SR-5/1.5-W36-C OKI-78SR-5_1.5-W36-C | Converter_DCDC_Murata_OKI-78SR_Horizontal | U2 |
| 1 | PCF8574ADWR PCF8574 | SOIC16R | U4 |
| 1 | MAX31855KASA+T MAX31855KASA | SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | LD1117S33CTR LD1117S33TR_SOT223 | SOT-223-3_TabPin2 | U7 |
| 1 | ESP32-S2-SOLO-N4R2 ESP32-S2-SOLO | ESP32-S2-SOLO | U8 |
| 1 | BC850BLT1G BC850 | SOT-23 | Q1 |
| 2 | 61300311121 Conn_01x03_Pin | PinHeader_1x03_P2.54mm_Horizontal | J1, J3 |
| 1 | 61300611121 Conn_01x06 | PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | 691137710002 Screw_Terminal_01x02 | TerminalBlock_MetzConnect_Type094_RT03502HBLU_1x02_P5.00mm_Horizontal | J4 |
| 1 | USB4125-GF-A USB_C_Receptacle_USB2.0_16P | USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J5 |
| 1 | PJ-102A Barrel_Jack | BarrelJack_CUI_PJ-102AH_Horizontal | J6 |
| 1 | B04B-PASK Conn_01x04 | PinHeader_1x04_P2.00mm_Vertical | J7 |
| 1 | WYTP26-2004YG HY1602E | HY1602E | DS1 |
| 2 | 507-1089-2 500mA Fuse | Fuse_0603_1608Metric | F1, F2 |
| 1 | A0 | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | A1 | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | A2 | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | Jumper_2_Open | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP4 |
| 1 | TC33X-2-103E potentiometer | Potentiometer_Bourns_TC33X_Vertical | RV1 |
Show 15 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TL3305AF260QG Reset | SW_SPST_TL3305A | SW5 |
| 1 | TL3305AF260QG Boot | SW_SPST_TL3305A | SW6 |
| 1 | 150080RS75000 LED | LED_0805_2012Metric | D1 |
| 2 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D7, D8 |
| 2 | BLM18KG121TN1D FerriteBead_Small | R_0603_1608Metric | FB1, FB2 |
| 5 | CL21A106KOQNNNE 10uF | C_0805_2012Metric | C1, C2, C13, C14, C17 |
| 2 | GRM188R60J226MEA0D 22uF | C_0603_1608Metric | C3, C4 |
| 1 | CC0805KRX7R9BB103 0.01uF | C_0805_2012Metric | C5 |
| 5 | CL21B104KCFNNNE 0.1uF | C_0805_2012Metric | C10, C16, C18, C20, C21 |
| 1 | CL21B105KAFNNNE 1uF | C_0805_2012Metric | C19 |
| 5 | 10k | R_0603_1608Metric | R1, R2, R3, R4, R5 |
| 3 | RK73H2ATTD4701F 4.7k | R_0805_2012Metric | R6, R7, R9 |
| 1 | RR1220P-102-D 1k | R_0805_2012Metric | R8 |
| 1 | RMCF0603JT10K0 10k | R_0603_1608Metric | R10 |
| 2 | RC0805JR-075K1L 5.1k | R_0805_2012Metric | R11, R12 |
COFFEE MAKER design files
The KiCad project lives in the liammchugh/HOPE_CoffeeRoaster repository on GitHub; these links point at the commit this page was built from.
COFFEE MAKER: common questions
What microcontroller does the COFFEE MAKER use?
The COFFEE MAKER is built around the ESP32-S2-SOLO-N4R2, from the ESP32 family.
How big is the COFFEE MAKER PCB?
The COFFEE MAKER measures 131.4 × 99.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the COFFEE MAKER?
55 components, from 35 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the COFFEE MAKER design files?
From the liammchugh/HOPE_CoffeeRoaster repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the COFFEE MAKER design in my own project?
The repository has no license, so all rights stay with liammchugh. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the COFFEE MAKER without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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