MrReflow
About the MrReflow PCB
MrReflow is an open source ESP32 PCB design by C3MA, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 55 × 96 mm, with 26 components from 16 distinct parts.
Its main chip is the ESP32-WROOM-32D, from the ESP32 family. Other key parts include the AMS1117-3.3. By type, the board carries 11 capacitors, 5 resistors, 2 ICs, 2 connectors and 1 diode.
From the project
The board was built with manily through hole components for easy build and production with a mill.
Main components on the MrReflow
MrReflow bill of materials (BOM)
26 components, 16 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U1 |
| 1 | ESP32-WROOM-32D | ESP32-WROOM-32 | U4 |
| 1 | Conn_01x02_Male | PhoenixContact_MSTBA_2,5_2-G-5,08_1x02_P5.08mm_Horizontal | J1 |
| 1 | Conn_01x03_Female | PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | Boot | SW_SPST_CK_RS282G05A3 | Boot1 |
| 1 | Conn_01x04_Male | PinHeader_1x04_P2.54mm_Vertical | Display1 |
| 1 | IRM-05-5 | Converter_ACDC_MeanWell_IRM-05-xx_THT | PS1 |
| 1 | SW_Push | SW_SPST_CK_RS282G05A3 | Reset1 |
| 1 | Conn_01x05_Female | PinHeader_1x05_P2.54mm_Vertical | Thermocouple1 |
| 1 | WS2812B | LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1 |
| 3 | 100n | C_0805_2012Metric | C1, C2, C5 |
| 3 | 22uf | C_0805_2012Metric | C3, C4, C6 |
| 1 | 22uF | C_0603_1608Metric | C7 |
| 4 | 47uF | C_0805_2012Metric | C8, C9, C10, C11 |
| 4 | 1k | R_0805_2012Metric | R13, R14, R15, R17 |
| 1 | 10k | R_0805_2012Metric | R16 |
MrReflow design files
The KiCad project lives in the C3MA/MrReflow repository on GitHub; these links point at the commit this page was built from.
- Layoutboard/board/MrReflow.kicad_pcb
- Schematicboard/board/MrReflow.kicad_sch
MrReflow: common questions
What microcontroller does the MrReflow use?
The MrReflow is built around the ESP32-WROOM-32D, from the ESP32 family.
How big is the MrReflow PCB?
The MrReflow measures 55 × 96 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MrReflow?
26 components, from 16 distinct parts. The full bill of materials is listed on this page.
Where can I download the MrReflow design files?
From the C3MA/MrReflow repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the MrReflow design in my own project?
Yes, under the terms of its GPL-3.0 license, which C3MA chose for the repository.
Can I test firmware for the MrReflow 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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