ESP-01S 8266 WIFI module

Model: YZQ-S014
Technical parameters:
GND: GND
CPI02: General 10, internally pulled up
CPI00: Working module
Floating: FLASH BOOT
Working mode pull-down: USRT DOWNLOAD
Download mode
RXD: Serial O data receiving end
RXDVCC: 3.3V module power supply
RST: 1, external reset pin, low level reset
2, can be suspended or connected to external MCU
CH PD: chip enable, high level enable, low level enable
TXD: Serial port 0 data transmitter TXD