https://github.com/bschwind/esp32-autoflasher

Auto-flashing circuit based on the CP2102N
https://github.com/bschwind/esp32-autoflasher

Last synced: 8 months ago
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Auto-flashing circuit based on the CP2102N

• Host: GitHub
• URL: https://github.com/bschwind/esp32-autoflasher
• Owner: bschwind
• License: mit
• Created: 2019-05-06T15:28:38.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2020-12-01T10:07:02.000Z (over 5 years ago)
• Last Synced: 2025-03-20T17:51:46.222Z (about 1 year ago)
• Homepage:
• Size: 276 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# esp32-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](https://oshpark.com/shared_projects/q04gDLKl)

## 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

![schematic](images/schematic.png)

### PCB Layout

![pcb](images/pcb.png)

### Assembled

![assembled](images/assembled.jpg)