This is Arduino Form factor compatible (The pin mapping is different here when compared to the old D1 product)

You can program this device via the regular Arduino IDE..  Very interesting piece of kit for anyone interesting in

prototyping with Arduino form factor shields while leveraging off the capability of the Wemos ESP8266 Wifi Chip.

You can also treat this board like a nodeMCU and then run Arduino Shields on it. All in all extremely clever and great value for money.

If you are a Maker, an experimenter, a prototyper, I'd highly recommend one.

 

What's new V2.1.0

•  Use BRT (Bias Resistor Transistor), easier entry into flash mode.
•  Optimize the circuit, the system is more stable.

 

About D1 R2 V2.1.0

• based on the ESP-8266EX.
• Arduino Compatible, you can use it on Arduino IDE.
• NodeMcu Compatible
• 11 Digital I/O pins
• 1 Analog Input pin
• OTA -- Wireless Upload(Program)
• On board switching power supply -- Max 24V input, 5V 1A output

 

 

The D1 R2 is a mini wifi board based on the ESP-8266EX.

• 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except for D0)
• 1 analog input(3.2V max input)
• Micro USB connection
• Power jack, 9-24V power input.
• Compatible with Arduino
• Compatible with nodemcu

Getting Started

Arduino

 

• Getting Started in Arduino

NodeMcu

 

• Getting Started in NodeMCU

Technical specs

 

Microcontroller	ESP-8266EX
Operating Voltage	3.3V
Digital I/O Pins	11
Analog Input Pins	1(Max input: 3.2V)
Clock Speed	80MHz/160MHz
Flash	4M bytes
Length	68.6mm
Width	53.4mm
Weight	25g

Documentation

Board size

 

d1_r2_size.png

Schematics

 

d1_r2.pdf

Pin

 

Pin	Function	ESP-8266 Pin
TX	TXD	TXD
RX	RXD	RXD
A0	Analog input, max 3.3V input	A0
D0	IO	GPIO16
D1	IO, SCL	GPIO5
D2	IO, SDA	GPIO4
D3	IO, 10k Pull-up	GPIO0
D4	IO, 10k Pull-up, BUILTIN_LED	GPIO2
D5	IO, SCK	GPIO14
D6	IO, MISO	GPIO12
D7	IO, MOSI	GPIO13
D8	IO, 10k Pull-down, SS	GPIO15
G	Ground	GND
5V	5V	-
3V3	3.3V	3.3V
RST	Reset	RST

All of the IO pins have interrupt/pwm/I2C/one-wire support except D0

Programming

 

The D1 R2 has a micro USB for auto programming.
You can also program it using OTA.

Warnings

 

All of the IO pins run at 3.3V.