While the Feather HUZZAH ESP8266 comes pre-programmed with NodeMCU's Lua interpretter, you don't have to use it! Instead, you can use the Arduino IDE which may be more familar. This will write directly to the firmware, erasing the NodeMCU firmware, so if you want to go back to Lua, use the flasher to re-install it
Don't forget to visit esp8266.com for the latest and greatest in ESP8266 news, software and gossip!
In order to upload code to the ESP8266 and use the serial console, connect any data-capable micro USB cable to the Feather HUZZAH and the other side to your computer's USB port.
Don't forget you will also need to install the SiLabs CP2104 Driver:
On Mac OS 10.13 and higher, in addition to installing, you will have to give the CP2104 kernel driver permission to load. You can find out if you need to give additional permission by visiting your Security & Privacy settings system preferences screen after installing and looking for the message that says, 'System software from developer "SiLabs" was blocked from loading', like in the picture below.
To allow the driver to load, click the lock icon, enter your password, and click "Allow" next to the warning message. After that, you may have to restart your computer before following the steps below and connecting to your Huzzah in the Arduino app.
If you are using Mac OS 10.12.6 (Sierra) and you cannot upload with the latest Mac OS VCP driver, please try the legacy v4 driver below. Note you will need to uninstall the v5 driver using uninstall.sh (in the driver package)
Install the Arduino IDE 1.6.8 or greater
Download Arduino IDE from Arduino.cc (1.6.8 or greater) from Arduino.cc
The latest is usually the best
Install the ESP8266 Board Package
Enter http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Board Manager URLs field in the Arduino v1.6.4+ preferences.
Next, use the Board manager to install the ESP8266 package.
After the install process, you should see that esp8266 package is marked INSTALLED. Close the Boards Manager window once the install process has completed.
Setup ESP8266 Support
When you've restarted, select Adafruit Feather HUZZAH ESP8266 from the Tools->Board dropdown
80 MHz as the CPU frequency
You can keep the Flash Sizeat "4M (3M SPIFFS)
For Upload Speed, select 115200 baud (You can also try faster baud rates, we were able to upload at a blistering 921600 baud but sometimes it fails & you have to retry)
The matching COM port for your FTDI or USB-Serial cable
On a mac, you should look for the "SLAB_USBtoUART" port
Blink Test
We'll begin with the simple blink test
Enter this into the sketch window (and save since you'll have to)
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH);
delay(500);
digitalWrite(0, LOW);
delay(500);
}
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH);
delay(500);
digitalWrite(0, LOW);
delay(500);
}
Now you can simply upload! The Feather HUZZAH has built in auto-reset that puts it into bootloading mode automagically
The sketch will start immediately - you'll see the LED blinking. Hooray!
Connecting via WiFi
OK once you've got the LED blinking, lets go straight to the fun part, connecting to a webserver. Create a new sketch with this code:
/*
* Simple HTTP get webclient test
*/
#include <ESP8266WiFi.h>
const char* ssid = "yourssid";
const char* password = "yourpassword";
const char* host = "wifitest.adafruit.com";
void setup() {
Serial.begin(115200);
delay(100);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
int value = 0;
void loop() {
delay(5000);
++value;
Serial.print("connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
// We now create a URI for the request
String url = "/testwifi/index.html";
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
delay(500);
// Read all the lines of the reply from server and print them to Serial
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
/*
* Simple HTTP get webclient test
*/
#include <ESP8266WiFi.h>
const char* ssid = "yourssid";
const char* password = "yourpassword";
const char* host = "wifitest.adafruit.com";
void setup() {
Serial.begin(115200);
delay(100);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
int value = 0;
void loop() {
delay(5000);
++value;
Serial.print("connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
// We now create a URI for the request
String url = "/testwifi/index.html";
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
delay(500);
// Read all the lines of the reply from server and print them to Serial
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
Dont forget to update
const char* ssid = "yourssid";
const char* password = "yourpassword";
to your access point and password, then upload the same way: get into bootload mode, then upload code via IDE
Open up the IDE serial console at 115200 baud to see the connection and webpage printout!
That's it, pretty easy!
This page was just to get you started and test out your module. For more information, check out the ESP8266 port github repository for much more up-to-date documentation!
If your sketch does not compile and returns error:
error: return-statement with a value, in function returning 'void' [-fpermissive]
virtual void flush() { return iClient->flush(); };
You are most liklely using Firmware Beta 2.5.0 for the ESP8266. This update breaks compatibility with ArduinoHttpClient(which is used by Adafruit IO). The Adafruit IO Arduino library is currently unsupported by this beta firmware. To get it working, we'll downgrade the firmware on the ESP8266 to a stable version.
Launch the Board Manager from Arduino by navigating to Tools -> Boards -> Board Manager. Type ESP8266 into the search bar. From the dropdown, select version 2.4.2
Clicking install will uninstall the 2.5.0-beta and install a stable firmware version.
