Arduino tehNiq: ESP8266EX

Friday, December 9, 2016

WeMos D1 board (with ESP8266) as Web Switch Control with autoreconnect to wi-fi network

I tested an (retired now) WeMos D1 development board made with ESP8266EX microcontroller. About this board I found some info at https://www.wemos.cc/product

For easy use as other Arduino boards, is ok to see this picture:

Last project with this board is a Web Switch Control.

For upload a sketch like in any Arduino board must use newish Arduino IDE software from https://www.arduino.cc/en/Main/Software to have this situation:

For this, must go to FILES -> PREFERENCES

and add http://arduino.esp8266.com/package_esp8266com_index.json adress

(see detailed data in article Placa NodeMcu v.0.9 programata in Arduino IDE).

After that in TOOLS -> BOARD->BOARDS MANAGER you will see

and than

Now, Arduino IDE software is ready for verify/compile and upload the sketch.

First, I tested a sketch found at ESP8266 Community Forum in post named GARAGE DOOR OPENER EXAMPLE V2 (SEE POST #2). This sketch is writted by JoseAngel

This sketch made a webserver using AJAX style (static page and just some datas is changes).

My sketch led_controlled_from_webpage.ino has some change line, but I use same password (1234), and my led is at GPIO5 (D15/SCL) and GND (I not put 220-470 ohms resistor limiter, but is more good to put). I use 8087 port, but you can change to 80.

I made WeMos board control a led using protected webpage using Ajax movie when you can how it use and control the led:

After I tested about one mounth, I see some problemes, when wi-fi router is disconnected and reconnect.. so, I study but I give a tip from a collaborator, Mircea Craciun, who indicate my another post from ESP8266 forum.

Now, my sketch led_controlled_from_webpage_auto.ino made autocreconnect in wi-fi network if apear some problemes.

I put an LED for wi-fi error at GPIO12 (D12/MISO) and GND.

At first start, after restart or if link between router and WeMos is broken, second led blink until link with wi-fi is ok. You can see in ESP8266 Switch control with autoreconnect to wi-fi network movie how WeMos D1 board is working.

At http://www.esp8266.com/wiki/doku.php?id=arduino-docs I found how I can use EEPROM memory from ESP8266EX microcontroller for store the state of led (ON or OFF) and number of good clicks (just for see how work the system).