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The D1 R2 is a mini wifi board based on ESP-8266EX.
11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0)
1 analog input(3.3V max input)
A Micro USB connection
A power jack, 9-24V power input.
Compatible with
Compatible with nodemcu
Technical specs:
Microcontroller
ESP-8266EX
Operating Voltage
3.3V
Digital I/O Pins
11
Analog Input Pins
1
Clock Speed
80MHz/160MHz
FLash
4M bytes
Length
68.6mm
Width
53.4mm
Weight
25g
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,Pull-up
GPIO0
D4
IO,pull-up, BUILTIN_LED
GPIO2
D5
IO, SCK
GPIO14
D6
IO, MISO
GPIO12
D7
IO,MOSl
GPIO13
D8
IO,pull-down, SS
GPIO15
G
Gound
GND
5V
5V
-
3V3
3.3V
3.3V
RST
Reset
RST
*All IO have interrupt/pwm/I2C/one-wire supported(except D0) Programming:
The D1 R2 has a micro USB for auto programming.
Also you can programming it using OTA
Warnings: All IO is work at 3.3V.
Package included: 1 x D1 R2 WiFi ESP8266 Development Board
I am delighted with this little board, it is well made and very fast. Hardware wise a very high quality product.
There is one caveat if you are using this with arduino you must install downlevel Arduino 1.6.5 ide as the Wemos libraries are not yet supporting the 1.6.6 ide. If you try to use this ide your code will refuse to compile with warnings like "Warning: platform.txt from core 'WeMos LGT Boards' contains deprecated tools.avrdude.cmd.path="
Please keep in mind, the deprecated code will only stop you from developing with the latest IDE, it works very well with the last version! I feel certain that the Wemos developers will soon fix the library.
Overall I think this is a valuable product for those that wish to go beyond the capabilities of a standard Arduino and considering the fact that it has built in WiFi one should conclude that this board is a bargain.
See request at "http://webcache.googleusercontent.com/search?q=cache:zKBDmcwzwEsJ:https://github.com/wemos/WeMos_Boards/issues/4+&cd=1&hl=en&ct=clnk&gl=uk"
After configuring my IDE and downloading the relevant examples (takes about 15 mins to do this) I then had great success and managed to create a simple HTTP Web Server (see photo).
Only restriction is one analogue input pin available so only one sensor can be connected. Perhaps I2C can get round this limitation (not yet tried).
Also, all pins are 3.3v so watch out for 5v external boards which will damage this one without reducing that (easy to do with level converters or even a voltage divider with two resistors).
I also connected this to a NTP (Timer Server) so no need to connect to a DS3231 RTC (Real Time Clock) module; time always up to date!
Worth buying one just to experiment with and seeing what can be done once the wires are gone and you have wifi freedom.
Roymall C.o.
Free Gift
Shipping Policy
Return Policy
Coupon Code
Direct purchase from the factory 
Electronic Components & Supplies
Module Board
Smart Module
