Under Tools/Boards select “WeMos D1 R1”.Under Boards Manager, install ESP8266 boards.Open Preferences window and enter the following into the ‘Additional Board Manager URLs’ field: “”.There are many instructions for installing and using ESP8266 based boards with the Arduino IDE, but here is a short-hand version. These are clone assemblies with good build quality It can be programmed using the Arduino IDE via the USB port as shown below. The board runs at 3.3V, so keep that in mind when working with I/O. The board can be powered via the USB port or using an external 7-12V power supply via the DC Power Jack. With Arduino, output D3 would be referred to simply as ‘3’, but with the D1 board, you need to refer to the pin as ‘D3’. Note that when programming the board, you need to refer to the I/O using both the letter and number. Per spec, the digital I/O is limited to 3.3V, but the ESP-8266 mfr has made statements that the digital pins are in fact 5V tolerant and there are many installations using the module directly connected to the logic lines of 5V peripherals. That can always be overcome by using an external Analog Mux module like our 16-channel 74HC4067, ADS1115 4-Channel 16-bit ADC or the MCP3008-I/P 8 channel A/D converter IC below if more analog I/O is desired. In addition they can be configured to have pull-up or pull-down resistors On the down-side, it has only 1 analog input which is probably the most significant limitation. The Digital I/O except for D0 all support PWM and interrupts.

PACKAGE INCLUDES:īesides adding WiFi capability, the main claim to fame for the ESP8266 processor over the AVR processor of the standard Arduino is that it has a larger 4MB of Flash memory and runs at clock speeds of 80MHz and can sometimes optionally be overclocked to 160MHz and has a very fast processing speed. One of the images shows the difference in the pin mappings between the two versions.

If working with examples, you may need to reassign some pins depending on which version you are working with. There is also a newer R2 version which uses a different pin-out on some of the I/O.

The board is the original R1 compatible version. This board was originally produced by WeMos.

It will also work with some Uno shields that have compatible I/O pin-outs. It provides a way to work with the ESP8266 in a familiar setup and does not require a breadboard in order to make interconnections since it has the typical on-board female headers. The ESP8266 D1 R1 WiFi board utilizes the ESP8266 WiFi enabled processor, and puts it onto an Arduino Uno board footprint. Check out the newer R2 version of the board.

Arduino uno pin datasheet