chip board ENC28J60-I/SO. the board 25MHZ crystal. the network interface board HR911105A. 3.3 V power supply pin. PCB size: 63x18x15mm Positioning hole diameter: 3.1mm Weight: about 17g PCB with Ethernet connector: 67x18x17 mm PCB bottom pins: 9.5mm Compatible with Nano Ethernet driver: Microchip ENC28J60 Colour:As Shown Material:PCB Debug reminder: 1, the IP address of the computer to a network segment and module such as IP module 192.168.1.2, IP computer set: 192.168.1.3; 192.168.1 is the 3 section; 2, cross the network cable connected to the mouth of the computer network module and mouth; (that is, the cable network 1 3,2 cross, and then do not understand that there are pictures Baidu); 3, the module and the MCU connection should pay attention to the connection of each line is reliable (the surface is not even connected to the good); 4, and the MCU port IO to confirm that is right; 5, the program recompile, download, confirm whether to download! STM32 and 51 IO Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 * for Arduino Nano board 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.