4 layers48.9 × 57.2 mm
2 layers17.8 × 27.9 mm
Auto-flashing circuit based on the CP2102N
- Size
- 17.8 × 27.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 28
- Pads
- 70
- Tracks, vias
- 137, 16
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 6 May 2019
- Updated
- 1 Dec 2020
Overview
Flash is an open-source printed circuit board by bschwind, from the bschwind/esp32-autoflasher repository on GitHub, published under the MIT licence. It is a 2-layer board of 17.8 × 27.9 mm with 14 parts on 28 nets, routed with 137 tracks and 16 vias.
It is built around the CP2102N-A01-GQFN24 and MMBT2222ALT1G-CN. Its parts include 5 resistors, 4 capacitors, 2 transistors, 2 connectors and 1 IC.
Main components
2README
README.mdesp32-autoflasher
KiCad PCB based on the CP2102N USB-UART serial converter. This implements the "auto reset" circuits of most ESP32 dev boards. You can run things like esp-idf's make flash or flash code from the Arduino IDE without having to hold down any buttons.
Connect EN, RX, TX, IO0, and GND to their respective pins on the ESP32 (don't forget to swap the RX and TX pins!) and make sure you have the Silicon Labs CP210x driver installed on your OS.
You can order this PCB on OshPark
Required Parts
(All resistors and capacitors are size 1608 metric)
| Label | Description |
|---|---|
| U1 | CP2102N |
| R1 | 1 kOhm |
| R2 | 10 kOhm |
| R3 | 22.1 kOhm |
| R4 | 10 kOhm |
| R5 | 47.5 kOhm |
| C1 | 4.7 uF |
| C2 | 0.1 uF |
| C3 | 4.7 uF |
| C4 | 0.1 uF |
| Q1 | MMBT2222L transistor (SOT-23 package) |
| Q2 | MMBT2222L transistor (SOT-23 package) |
Images
Schematic
PCB Layout
Assembled
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 0.1uF | Capacitors_SMD:C_0603_HandSoldering | C2, C4 |
| 2 | 10 kΩ | Resistors_SMD:R_0603_HandSoldering | R2, R4 |
| 2 | 4.7uF | Capacitors_SMD:C_0603_HandSoldering | C1, C3 |
| 2 | MMBT2222ALT1G | mmbt2222alt1g:mmbt2222alt1g | Q1, Q2 |
| 1 | 1 kΩ | Resistors_SMD:R_0603_HandSoldering | R1 |
| 1 | 22.1 kΩ | Resistors_SMD:R_0603_HandSoldering | R3 |
| 1 | 47.5 kΩ | Resistors_SMD:R_0603_HandSoldering | R5 |
| 1 | CP2102N-A01-GQFN24 | Housings_DFN_QFN:QFN-24-1EP_4x4mm_Pitch0.5mm | U1 |
| 1 | Conn_01x05 | Pin_Headers:Pin_Header_Straight_1x05_Pitch2.54mm | J2 |
| 1 | USB_B_Micro | 10118194-0001lf-circle:10118194-0001lf-circle | J1 |
Questions
How big is the Flash PCB?
It measures 17.8 × 27.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Flash use?
14 parts, built around the CP2102N-A01-GQFN24 and MMBT2222ALT1G-CN. 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 Flash KiCad files?
From the bschwind/esp32-autoflasher repository on GitHub, at the commit this page was made from: the board is flash.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flash design in my own project?
Its repository publishes it under the MIT 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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