esp8266-WROOM-02D optimized version

I refer to Jixiaoxin's board and use it instead. The USB direct download function is removed, mainly because I don't have a chip, so... Then I have a TTL cable on hand. The USB port can only be used to connect power and cannot be used to download programs. After the program is completed, you can use the USB port to power the program. To download the program, you need to equip an additional TTL cable, which is connected to the P6 interface on the upper right. Use the TTL port for GND, TXD, RXD, and 3V3 in the program. After connecting the TTl cable (if it is wrong, you can swap it txd and rxd lines), prepare the appropriate program, you can try the espeasy program, you can download it from github, prepare the program, click download and you will be prompted to power on or something, the TTL port must have been connected to the power, then press and hold The BOOT button enters io0 and is pulled down, which is the download mode (hold it down, not press it once. If the program starts to download, you can release the BOOT button). When the program download is completed, press the rest button to complete the restart. You can connect to the Internet according to the espeasy prompts. About espeasy I will post the URL of the tutorial, [https://oshwhub.com/woniuzaibei/zi-ji-hui-zhi-yuan-qi-jian](https://oshwhub.com/woniuzaibei/zi-ji-hui-zhi- yuan-qi-jian)