This module is composed of OLED IIC interface module and EC11 rotary encoder combined module, two It is not associated, just placed on a board, made into an integrated module, with additional return and Confirm the key, the key interface is also , you can choose to use according to the actual use. Integrated design, more simple and beautiful, convenient DIY. 1.3Inch OLED+EC11 rotary encoder OLED driver chip: SH1106 OLED interface: IC EC11: Plum handle, handle length 15mm,20 Pulse 20 positioning, 5 pin strap switch CON(KEY1): Confirms the key interface SDA: Data interface for OLED screen IIC communication SCL: Clock interface for OLED screen IIC communication : key interface of EC11 TRA, : phases A and B of EC11 (KEY0): Returns the key GND: Power source VCC:3.3V power supply positive Colour:P o Color Material:plastic Package Contents: 1 x display 1 x pin header Only the above package content, other products are not included. Note: Light reflection 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.