4Pcs ESP8266 Serial Wifi Module ESP-01 Updated Wireless Transceiver Board 3.3V for Arduino

Description

ESP8266 is a highly integrated chip designed for the needs of a new connectedworld. It offers a complete and self-contained Wi-Fi networking solution,allowing it to either host the application or to offload all Wi-Fi networkingfunctions from another application processor.Specifications:Serial/UART baudrate: 115200 bpsInput power: 3.3VI/O voltage tolerance: 3.6V MaxFlash MemorySize: 1MB (8Mbit)WiFi security modes: WPA, WPA2Package Including4 ESP8266Wifi Transceiver Module Version II—How to use??Version II(All IO serial portversion) Note:The power supply should be 3.3v!!about this version II,if youwant to enter into AT command by FLASH boot,just need connect CH-PD pin withVCC pin or pull up resistor to keep high-level.(Sometimes without pulling upthe resistor,there’s no data on the serial port)The other three pins don’tneed to connect anything,if you connect them with VCC pin and failedrestart,you shouldn’t connect them.When GPIO0 is high-level,it means FLASHbooting.When GPIO0 is low-level,it means upgrading the system.At thismoment,you can upgrade the internal firmware by serial port. AndRST(GPIO16)can be used to reset the external hardware.P.S.Different testsystems may use different connecting ways,so you need choose the bestconnecting ways by yourself.Hereby we recommend one connecting way to connectesp01 module with serial port TTL tools.:After welding a 4.7k resistancebetween CH-PD pin and VCC pin. it needs connect UTXD,GND,VCC and URXD pin withUSB-TTL(TXD and RXD need keep cross-linking)to test.

Features:

• Note: The item only supports 3.3V, please don’t use 5V!
• Model: Esp-01.Compatible with Arduino. Support 3 modes: AP, STA, AP + STA
• ESP8266 is a WiFi enabled Microcontroller Arduino ready
• Updated version ESP-01,with stronger signal
• Complete and self-contained Wi-Fi networking solution