ESP8266Duino

#Introduction to the development board based on ESP8266 and compatible with the Arduino UNO R3 interface. The biggest function is to give the ESP8266 module that is sold for free in the mall a place to stay. # Features * Compatible with Arduino® UNO R3 * Compatible with most ESP8266 modules, such as mall gifts [WT8266-S5 ESP-12F](https://item.szlcsc.com/839416.html) * Type-C interface , with automatic download circuit * DC power supply accepts 7~16V input voltage * Minimize the IO shortage problem of ESP8266 through optimized IO multiplexing layout. * The ADC interface uses an op amp follower circuit to extend the ADC input voltage range of ESP8266 from 0~1V to 0~5V * Independent power supply, communication indicator light and user LED indicator light (connected to GPIO2) * The minimum component package is 0805, Easy to solder* Compatible with [Arduino 1.8'' TFT Shield](https://oshwhub.com/micespring/adafruit-1-8-tft-shield-v1-clone)# Description## ADC selection because the 8266 has only one ADC , while the standard Arduino® UNO R3 has 6 ADC channels, you need to select the channel connected to the ESP8266 through jumpers JP1~JP4. Only one of JP1~JP4 can be shorted at the same time. In addition, the A4A5 channel becomes IIC-specific and no longer has the ADC function. ![image.png] ## IO multiplexing Because the number of IOs of ESP8266 is insufficient, the corresponding D3~D7 channels and D8~D12 channels of Arduino® are multiplexed. But by default, D8~D12 channels are directly connected, and D3~D7 are left floating. If you need to connect the D3~D7 channels, you need to manually short JP5~JP9 on the back. Please refer to the schematic diagram for the mapping relationship. ![image.png] # Actual picture![IMG_1621.JPG]