Arduino ESP8266 WiFi Shield

ESP8266 Shield

This is a common ESP8266 Arduino shield with the following markings:

WiFi 2.4 GHz
802.11 b/g/n
Designed in
Beijing
P.R.China
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Arduino ESP8266 WiFi
Shield Version 1.0
by WangTongze

The voltage switching circuitry on this shield doesn't work properly as it arrives, so you'll have to modify it slightly if you intend it to work as a shield (with SW1 and SW2 set to ON).

The DIP switches are:

Switch Function
SW1 Connect ESP8266 TX to pin D0
SW2 Connect ESP8266 RX to pin D1
SW3 Enable bootloader mode
SW4 Use DFU LED to show serial activity (?)

Power is drawn from the 5v pin (not Vin) so if connecting to Pixl.js ensure that Vin and 5V are shorted on the solder jumper unless you plan to power the shield separately.

Using as-is

  • Ensure SW1 and SW2 are OFF
  • Connect a jumper lead from the TXD pin on Debug Port to D0 on the Arduino header
  • Connect a jumper lead from the RXD pin on Debug Port to D1 on the Arduino header

Rewiring

ESP8266 Shield ESP8266 Shield

  • Unsolder all the surface mount components to the right-hand side of the ESP8266
  • Short across the two transistor outlines from the right pad to the bottom-left pad
  • Ensure SW1 and SW2 are ON
  • TXD and RXD should now be available on D0 and D1 at 3.3v levels

Pixl.js

If connecting to Pixl.js you should be aware that when if Pixl.js detects a connection on D0 at boot, it'll start using Serial1 as a console device rather than the LCD.

To avoid this you'll need to explicitly set the console back to the LCD at boot time:

function onInit() {
  Terminal.setConsole();
}

Software

Client

To connect to a WiFi access point.

var WIFI_NAME = "WiFi_Name";
var WIFI_PASS = "WPA2_Key";
var wifi;

function getPage() {
  require("http").get("http://www.pur3.co.uk/hello.txt", function(res) {
    console.log("Response: ",res);
    res.on('data', function(d) {
      console.log("--->"+d);
    });
  });
}

function go() {
  Serial1.setup(115200,{rx:D0,tx:D1});
  wifi = require("ESP8266WiFi_0v25").connect(Serial1, function(err) {
    if (err) throw err;
    console.log("Connecting to WiFi");
    wifi.connect(WIFI_NAME, WIFI_PASS, function(err) {
      if (err) throw err;
      console.log("Connected");
      // Now you can do something, like an HTTP request
      getPage();
    });
  });
}

Access point

To set up as an access point called ESP123 with password HelloWorld that serves up a webpage on address 192.168.4.1:

var wifi;

function pageHandler(req, res) {
  res.writeHead(200);
  res.end("Hello World");
}

function go() {
  Serial1.setup(115200,{rx:D0,tx:D1});
  wifi = require("ESP8266WiFi_0v25").connect(Serial1, function(err) {
    if (err) throw err;
    console.log("Connecting to WiFi");
    wifi.createAP("ESP123","HelloWorld",5,"wpa2_psk", function(err) {   
      if (err) throw err;
      console.log("Connected!");
      require("http").createServer(pageHandler).listen(80);
    });
  });
}

See the ESP8266 page for more information on how to use the ESP8266, and the Internet page for more examples of things you can do on Espruino with an Internet connection.

Buying

  • eBay - the boards mentioned on this page are the ones with the red DIP switch on.

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