【ESP8266】Development board

Anxin is such a good company () A lot of friends must have come to the recent 1 yuan sample collection event~

I built a variety of ESP8266 modules and thought about making a development board for fun, so I came up with this project.

(Happy.jpg

The main function

A simple ESP8266 development board, including WS2812 RGB LED, and SHTC3 temperature and humidity sensor, compatible with ESP12F 12E 12S 07S 01S and other models, TypeC interface, simple and easy to use.

Package drawing

Because ESP12F 12E 12S 07S is pin2pin compatible, it can be used directly, and I put the ESP01S package into the pad frame, so it is also compatible with ESP01S. You can even solder the DuPont header to use it as an ESP01S programmer.

All around are pinouts for normal operation. It is worth noting that the pads of the fourth pins of the left and right rows of pins are shifted downwards by a certain distance, so that the pins can just be stuck and not shake around, making it easier to solder. (Learned from Essence adapter board, but the optimal distance needs to be verified)

Moreover, the spacing between the pins is just right so that the adapter board provided by Essence can be plugged in, so as to avoid the trouble of soldering the adapter board and needing to remove it and re-solder it to the board.

(The LOGO of Lichuang EDA was not added in the first two versions, but was added after the open source. Please see the PCB diagram for details)

Component selection

Recently, the EMZ1 boss got a lot of 2812 LEDs, so he went to rob them () and painted them on the board. The current version uses 8, and they are powered by the same AMS1117-3.3 as the main control. , So far, there has been no problem of insufficient power supply due to excessive power, and I am very satisfied (laughs). You can extend it yourself if necessary. Please refer to the manual for power data to decide whether to upgrade the power supply. (Out of 1.6 million colors, you just stopped at this weird pink)

The Type-C interface can use South Korea’s C393939 , which is cheap and large.

At first, I used the C165948 from Korea Hanrong , which was very expensive, nearly 2 yuan a piece. Later I found out that the domestic C393939 is compatible with its Pin 2 Pin, cheaper and more beautiful, and only costs less than one yuan, so I used this one. .

There is not much to say about LDO, 1117-3.3v can be used as long as the power is enough.

The serial port chip is CH340E. This month (2020.08), I have their coupons, which can be used for free without losing money. But after looking at it, I still should use a 340C or 340G. It has a DTR port and can do automatic download. There is no need to manually press RST to reset every time. The R/D in the upper right corner switches the running/downloading state, the full name is Run/Download. After flipping the switch, you need to press the RST reset once to run in the corresponding mode.

welding video

<iframe src="//player.bilibili.com/player.html?aid=884175909&bvid=BV1rK4y1v7cn&cid=223325685&page=1" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"> </iframe> (The embedded code seems to be broken. Can you explain it after it was developed on an open source platform?)

Finally, thank you to EMZ1 for the heating table and NightFuryX for taking the photos.