1. Onboard and stable ESP-12F WIFI module, capacity 4M FLASH; Onboard l2C communication interface 0.96 inch OLED display; 2. Provide reference codes and documents in OLED display 51, STM32 and other environments; The onboard PCF8563T clock circuit can operate normally even if the power is off; 3. Extend the ESP8266UART interface to support secondary development and burn your own firmware; Provide ESP8266 factory firmware, schematic diagram; 4. Power supply mode: Mini USB5V power supply; Double-layer structure design, small size and better appearance, it is the for DIYWIFI clock. 1.0.96 inch OLED screen: the driver IC is ; 2. ESP-12F WIFI module: the flash memory capacity is 4MBYTE; 3. Mini USB 5V power interface; 4. PCF8563T clock chip; 5. CR1220 button battery: power supply for the clock circuit after power off 6. UART program download interface: short-circuit IO0 and GND when downloading, connect 3V3, TXD, RXD, and GND to 3V3, RXD, TXD, GND of the external TTL serial port module (called FT232 module), and insert the download I00 and GND link after completion; 7.0 LED interface: SDA, SCL, GND, 3V3; OLED self-luminous, no backlight Voltage: 3.3V-5V DC Viewing angle: 160 degrees or more Working temperature: -30 degrees Celsius to 70 degrees Celsius I2C interface: GND: Ground wire VCC: 3.3V-5V SCL: I2C serial clock (: A5; : 21) SDA: I2C serial data (: A4; : 20) size:29 x 29mm Material:PCB colour:Blue+black Package Contents: 1 x 0.96 Inch OLED Display Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.