Product Introduction TTL WiFi is designed and developed based on E SP M2 WiFi module which is extracted the TTL EN STATE and other pins Importantly the TTL WiFi is already built in the serial transparent transmission firmware and programmed which can realize the transparent transmit the data to the cloud on the real time together with low power control status indictor This board can replace the old wiring serial WiFi device to realize the data collection and control More details please visit this GitHub link to get the manual and tools https github com Smart SZDOITWiKi wiki E SP8266 TTLtoWiFiProduct Features Fully compatible with the original electrical interface and physical interface for the serial transparent bluetooth Built in the industrial transparent transmission firmware V3 0 with stability and reliability by using the Web Configuration Built in the high performance WiFi module E SP M2 with size 34mm 17mm 4mm Working voltage 4 5V 6 0V TTL working voltage 3 3V compatible with 5 0V Provided pins STATE TXD RXD EN Average current 80mA when data sent it is 170mA but it is 20A at deep sleep mode Support serial AT com mand Support re programmable OTA firmware update Seamless transparent transmission between serial and WiFi Built in HTTP Web Server support configure parameters by web page Support re connect automatically at WiFi STA mode and TCP Client Support set baud rate data bit parity check stop bits and or subcontracting time Support b