ESP8266 development board & download board

I made an ESP8266 development board while studying Lichuang's ESP8266 Internet of Things course during the winter vacation. I checked the development board of the Jixiaoxin team and found that there were some areas that could be improved, so I made this board. The original project address: https:/ /oshwhub.com/jixin003/iot\_board\_esp12

Compared to newer boards:

1. Change the USB port to Type-C port

2. Added automatic download circuit!

The serial port chip used in the original circuit is CH340C. Why not just add an automatic download circuit?

In fact, there is a problem with the soldering iron tip of my electric soldering iron at home, and the board is a mess, so I did not solder the two S8050s Q1 and Q2 and the two 10K resistors R4 and R5 on my own board.

3. Changed the packaging of ESP-12F module

This package is the package of Essence's ESP-12E&F. I found that the holes in this package happened to correspond to the holes on the ESP-12F, and the 2.0 pin header could just fit in, so I thought about changing it into a download board.

The installation effect is like this

overall effect:

No ESP-12F, DHT11, OLED added

After adding these devices

in addition:

There seems to be something wrong with the peripheral circuit of this DHT11. I plugged in the DHT11, but I can't read the data. It seems to be because the pins of the DHT11 are too thin and do not match the pin header. You can add some tin to the DHT11 pins. Bold pins. This was originally an AD project and was imported directly into Lichuang EDA. There is a small problem, that is, there are some missing annotations in the schematic diagram. I will put the AD project below.

You can directly use Lichuang EDA to export Gerber files for pattern making, just ignore the DRC.