ESP8266 ADAFRUIT | Alldatasheet
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Adafruit Feather HUZZAH ESP8266 Created by lady ada Last updated on 2018-01-11 03:27:01 PM UTC
I2C & SPI pins GPIO pins Analog Pins Other control pins NC Pins Assembly Header Options! Soldering in Plain Headers Prepare the header strip: Add the breakout board: And Solder! Soldering on Female Header Tape In Place Flip & Tack Solder And Solder! Power Management Battery + USB Power Power supplies Measuring Battery ENable pin Using NodeMCU Lua Open up serial console Hello world! Scanning & Connecting to WiFi WebClient example Using Arduino IDE Install the Arduino IDE 1.6.8 or greater Install the ESP8266 Board Package Setup ESP8266 Support Blink Test Connecting via WiFi Downloads Datasheets & Files More info about the ESP8266 Schematic © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 2 of 42
ESP8266 F.A.Q. When I connect stuff to some of the pins, the Huzzah stops working. Whats up with that? My Huzzah board keeps crashing and resetting, whats up with that? I can't seem to find the Serial port on my computer for the Feather HUZZAH? I still can't seem to find the Serial port on my computer for the Feather Huzzah! So, I’m getting a 'no such file' error compiling for ESP8266 on my Mac Whenever I start or reset the ESP8226 there's a bunch of "gibberish" on the Serial console I'm having difficulties uploading to the HUZZAH with the Arduino IDE I tried that, but I'm still having difficulties uploading with the Arduino IDE I'm stuck in bootloader mode and can't upload I can't get Lua to respond to my commands © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 3 of 42
Feather is the new development board from Adafruit, and like it's namesake it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores. This is the Adafruit Feather HUZZAH ESP8266 - our take on an 'all-in-one' ESP8226 WiFi development board with built in USB and battery charging. Its an ESP8266 WiFi module with all the extras you need, ready to rock! We have other boards in the Feather family, check'em out here © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 4 of 42
At the Feather HUZZAH's heart is an ESP8266 WiFi microcontroller clocked at 80 MHz and at 3.3V logic. This microcontroller contains a Tensilica chip core as well as a full WiFi stack. You can progam the microcontroller using the Arduino IDE for an easy-to-run Internet of Things core. We wired up a USB-Serial chip that can upload code at a blistering 921600 baud for fast development time. It also has auto-reset so no noodling with pins and reset button pressings. © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 5 of 42
To make it easy to use for portable projects, we added a connector for any of our 3.7V Lithium polymer batteries and built in battery charging. You don't need a battery, it will run just fine straight from the micro USB connector. But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically switch over to USB power when its available. © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 6 of 42
Here's some handy specs! Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in Light as a (large?) feather - 6 grams ESP8266 @ 80MHz or 160 MHz with 3.3V logic/power 4MB of FLASH (32 MBit) 3.3V regulator with 500mA peak current output CP2104 USB-Serial converter onboard with 921600 max baudrate for uploading Auto-reset support for getting into bootload mode before firmware upload
9 GPIO pins - can also be used as I2C and SPI
1 x analog inputs 1.0V max Built in 100mA lipoly charger with charging status indicator LED Pin #0 red LED for general purpose blinking. Pin #2 blue LED for bootloading debug & general purpose blinking Power/enable pin 4 mounting holes Reset button Comes fully assembled and tested, with a USB interface that lets you quickly use it with the Arduino IDE or NodeMCU Lua. (It comes preprogrammed with the Lua interpretter) We also toss in some header so you can solder it in and plug into a solderless breadboard. Lipoly battery and USB cable not included (but we do have lots of options in the shop if you'd like!) © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 7 of 42
© Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 8 of 42
- this is the common ground for all power and logic BAT - this is the positive voltage to/from the JST jack for the optional Lipoly battery USB - this is the positive voltage to/from the micro USB jack if connected EN - this is the 3.3V regulator's enable pin. It's pulled up, so connect to ground to disable the 3.3V regulator - this is the output from the 3.3V regulator, it can supply 500mA peak (try to keep your current draw under 250mA so you have plenty for the ESP8266's power requirements!) Logic pins This is the general purpose I/O pin set for the microcontroller. All logic is 3.3V Serial pins The ESP8266 runs on 3.3V power and logic, and unless otherwise specified, GPIO pins are not 5V safe! The analog pin is also 1.0V max! © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 9 of 42
are the serial control and bootloading pins, and are how you will spend most of your time communicating with the ESP module The TX pin is the output from the module and is 3.3V logic. The RX pin is the input into the module and is 5V compliant (there is a level shifter on this pin) These are connected through to the CP2104 USB-to-Serial converter so they should not be connected to or used unless you're super sure you want to because you will also be getting the USB traffic on these! I2C & SPI pins You can use the ESP8266 to control I2C and SPI devices, sensors, outputs, etc. While this is done by 'bitbanging', it works quite well and the ESP8266 is fast enough to match 'Arduino level' speeds. In theory you can use any pins for I2C and SPI but to make it easier for people using existing Arduino code, libraries, sketches we set up the following: I2C SDA GPIO #4 (default) I2C SCL GPIO #5 (default) © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 10 of 42
If you want, you can connect to I2C devices using other 2 pins in the Arduino IDE, by calling Wire.pins( sda, scl before any other Wire code is called (so, do this at the begining of setup() for example Likewise, you can use SPI on any pins but if you end up using 'hardware SPI' you will want to use the following: SPI SCK = GPIO #14 (default) SPI MOSI = GPIO #13 (default) SPI MISO = GPIO #12 (default) GPIO pins This breakout has 9 GPIO: arranged at the top edge of the Feather PCB All GPIO are 3.3V logic level in and out, and are not 5V compatible. Read the full spec sheet to learn more about the GPIO pin limits, but be aware the maximum current drawn per pin is 12mA These pins are general purpose and can be used for any sort of input or output. Most also have the ability to turn on an internal pullup. Many have special functionality: GPIO #0, which does not have an internal pullup, and is also connected a red LED. This pin is used by the ESP8266 to determine when to boot into the bootloader. If the pin is held low during power-up it will start bootloading! That said, you can always use it as an output, and blink the red LED. GPIO #2 , is also used to detect boot-mode. It also is connected to the blue LED that is near the WiFi antenna. It has a pullup resistor connected to it, and you can use it as any output (like #0) and blink the blue LED. GPIO #15 , is also used to detect boot-mode. It has a pulldown resistor connected to it, make sure this pin isn't pulled high on startup. You can always just use it as an output GPIO #16 can be used to wake up out of deep-sleep mode, you'll need to connect it to the RESET pin Also note that GPIO # 12/13/14 are the same as the SCK/MOSI/MISO 'SPI' pins! Analog Pins There is also a single analog input pin called A . This pin has a ~1.0V maximum voltage, so if you have an analog © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 11 of 42
voltage you want to read that is higher, it will have to be divided down to 0 - 1.0V range Other control pins We have a few other pins for controlling the ESP8266 RST - this is the reset pin for the ESP8266, pulled high by default. When pulled down to ground momentarily it will reset the ESP8266 system. This pin is 3.3V logic only EN (CH_PD) - This is the enable pin for the ESP8266, pulled high by default. When pulled down to ground momentarily it will reset the ESP8266 system. This pin is 3.3V logic only NC Pins The rest of the pins are labeled NC which means Not Connected - they are not connected to anything and are there as placeholders only, to maintain physical compatibility with the other boards in the Feather line! © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 12 of 42
We ship Feathers fully tested but without headers attached - this gives you the most flexibility on choosing how to use and configure your Feather Header Options! Before you go gung-ho on soldering, there's a few options to consider! The first option is soldering in plain male headers, this lets you plug in the Feather into a solderless breadboard © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 13 of 42
Another option is to go with socket female headers. This won't let you plug the Feather into a breadboard but it will let you attach featherwings very easily © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 14 of 42
We also have 'slim' versions of the female headers, that are a little shorter and give a more compact shape © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 15 of 42
Finally, there's the "Stacking Header" option. This one is sort of the best-of-both-worlds. You get the ability to plug into a solderless breadboard and plug a featherwing on top. But its a little bulky Soldering in Plain Headers Prepare the header strip: Cut the strip to length if necessary. It will be easier to solder if you insert it into a breadboard - long pins down © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 16 of 42
Add the breakout board: Place the breakout board over the pins so that the short pins poke through the breakout pads And Solder! Be sure to solder all pins for reliable electrical contact. (For tips on soldering, be sure to check out our Guide to Excellent Soldering (https://adafru.it/aTk) © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 17 of 42
Solder the other strip as well. © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 18 of 42
You're done! Check your solder joints visually and continue onto the next steps Soldering on Female Header Tape In Place For sockets you'll want to tape them in place so when you flip over the board they don't fall out Flip & Tack Solder After flipping over, solder one or two points on each strip, to 'tack' the header in place © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 19 of 42
And Solder! Be sure to solder all pins for reliable electrical contact. (For tips on soldering, be sure to check out our Guide to Excellent Soldering (https://adafru.it/aTk) © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 20 of 42
© Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 21 of 42
You're done! Check your solder joints visually and continue onto the next steps © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 22 of 42
We wanted to make the Feather HUZZAH easy to power both when connected to a computer as well as via battery. There's two ways to power a Feather. You can connect with a MicroUSB cable (just plug into the jack) and the Feather will regulate the 5V USB down to 3.3V. You can also connect a 4.2/3.7V Lithium Polymer (Lipo/Lipoly) or Lithium Ion (LiIon) battery to the JST jack. This will let the Feather run on a rechargable battery. When the USB power is powered, it will automatically switch over to USB for power, as well as start charging the battery (if attached) at 100mA. This happens 'hotswap' style so you can always keep the LiPoly connected as a 'backup' power that will only get used when USB power is lost. The JST connector polarity is matched to Adafruit LiPoly batteries. Using wrong polarity batteries can destroy your Feather © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 23 of 42
The above shows the Micro USB jack (left), Lipoly JST jack (top left), as well as the 3.3V regulator and changeover diode (just to the right of the JST jack) and the Lipoly charging circuitry (right below the regulator). There's also a CHG LED next to the USB jack, which will light up while the battery is charging. This LED might also flicker if the battery is not connected. Power supplies You have a lot of power supply options here! We bring out the BAT pin, which is tied to the lipoly JST connector, as well as USB which is the +5V from USB if connected. We also have the pin which has the output from the 3.3V regulator. We use a 500mA peak low-dropout regulator. While you can get 500mA from it, you can't do it continuously from 5V as it will overheat the regulator. We use this to power the ESP8266 which can draw spikes of 250+mA (although its not continuous). You should be able to budget about 250mA current available from the regulator, which will leave plenty for the WiFi module. Measuring Battery If you're running off of a battery, chances are you wanna know what the voltage is at! That way you can tell when the © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 24 of 42
battery needs recharging. Lipoly batteries are 'maxed out' at 4.2V and stick around 3.7V for much of the battery life, then slowly sink down to 3.2V or so before the protection circuitry cuts it off. By measuring the voltage you can quickly tell when you're heading below 3.7V Since the ESP8266 does not have multiple ADC pins, we didn't want to 'sacrifice' one for Lipoly battery monitoring. However we do have a tutorial that mentions how to do it, using two resistors. You can check out the wiring diagram here (use the VBat pin to measure) and the code here ENable pin If you'd like to turn off the 3.3V regulator, you can do that with the EN (able) pin. Simply tie this pin to Ground and it will disable the 3V regulator. The BAT and USB pins will still be powered © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 25 of 42
Each Feather HUZZAH ESP8266 breakout comes pre-programmed with NodeMCU's Lua interpreter. As of this writing, we ship with NodeMCU 0.9.5 build 20150318 powered by Lua 5.1.4 but it may be more recent Lua is still a work in progress, so we strongly recommend visiting NodeMCU and updating your Lua version to the very latest as they have the ability to make you the latest continuous build . Then follow their guide on how to update Lua! The Lua interpreter runs on the ESP8266 and you can type in commands and read out the results over serial. 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. Install the required CP2104 USB driver to have the COM/Serial port appear properly Don't forget to visit esp8266.com for the latest and greatest in ESP8266 news, software and gossip! Open up serial console Next up, on your computer, use a serial console program such as CoolTerm (Mac) or Putty (Windows) or screen (linux). Teraterm seems to dislike the initial 74400bps data stream from the ESP8266 so you can try it but you'll possibly need to reset the terminal software. Connect up to the COM or Serial port used by your cable, at 9600 Baud Make sure you have turned off any hardware handshake or flow control Putty isn't good with pasting code in, so you may not be able to copy-n-paste! Also make sure you have line endings set to CRLF "\\r\\n" Use any serial console program you like, we just happen to be used to Putty! Don't forget to install the USB driver for the CP2104 USB-to-Serial chip! © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 26 of 42
Once the terminal software is connected, click the Reset button on the Feather HUZZAH ESP8266 board to reset it and have it print out the welcome message: If you don't get this message, first check that the red/blue leds flickered when you press the reset button. If they didnt, make sure you've got the right baud rate selected in the software (9600) Hello world! Ok we can now turn on an LED. There is a red LED on each board, connected to GPIO #0 NodeMCU Lua's pinouts are not the same as the Arduino/gcc pinouts. We print the Arduino pinouts on the board so watch out! The Lua documentation for the ESP8266 has GPIO #4 and #5 swapped so if #4/#5 aren't working for you, try swapping! © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 27 of 42
So to set the pin #0 LED on and off (which would be pin #3 in Lua) first make it an output: Turn the LED on with: And off with: You can make this a little more automated by running a longer script. For longer text, pasting can be difficult as the lua interpreter needs a little delay time between characters and also require CR-LF settings. For that reason you may want to paste each line and then hit return manually. Pin Notes PCB/Arduino NodeMCU/Lua No pullups! gpio mode gpio OUTPUT gpio write gpio LOW gpio write gpio HIGH while do gpio write gpio HIGH tmr delay 1000000 wait 000 000 us second gpio write gpio LOW tmr delay 1000000 wait 000 000 us second end © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 28 of 42
The LED will now be blinking on and off. Note that since its in a loop, its not possible to get it to stop via the interpreter. To stop it, click the Reset button again! This code halts the processor during the tmr.delay, a smarter way to blink an LED is to use the timer capability to set off the LED control ( code from here Scanning & Connecting to WiFi We'll continue with a quick demo of scanning for WiFi and connecting. Once you're back at the Lua prompt, set the ESP8266 into WiFi Client mode with Then you can run the scanner and have it print out the available AP's or for more detail... Pin definition local pin local status gpio LOW local duration 1000 second duration for timer Initialising pin gpio mode pin gpio OUTPUT gpio write pin status Create an interval tmr alarm duration function if status gpio LOW then status gpio HIGH else status gpio LOW end gpio write pin status end wifi setmode wifi STATION print ap list function listap t for k v in pairs t do print k " : " v end end wifi sta getap listap © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 29 of 42
We can connect to the access point with wifi.sta.config and wifi.sta.connect - it will take a second or two to complete the connection, you can query the module to ask the status with wifi.sta.status() - when you get a 5 it means the connection is completed and DHCP successful WebClient example Once you're got the IP address you can connect to adafruit, for example, and read a webpage and print it out: You can also have the module do DNS for you, just give it the hostname instead of IP address: This is just a light overview of testing out your HUZZAH ESP breakout! For much more, check out NodeMCU's documentation page https://nodemcu.readthedocs.io/ for the details on what functions are available to you, as well as http://www.lua.org to learn more about the Lua scripting language print ap list function listap t for ssid v in pairs t do authmode rssi bssid channel string match v "(%d),(-?%d+),(%x%x:%x%x:%x%x:%x%x:%x%x:%x%x),(%d+)" print ssid authmode rssi bssid channel end end wifi sta getap listap wifi sta config "accesspointname" "yourpassword" wifi sta connect tmr delay 1000000 wait 000 000 us second print wifi sta status ()) print wifi sta getip ()) sk net createConnection net TCP sk on "receive" function sck c print c end sk connect "207.58.139.247" sk send "GET /testwifi/index.html HTTP/1.1\\r\\nHost: www.adafruit.com\\r\\nConnection: keep-alive\\r\\nAccept: */*\\r\\n\\r\\n" sk net createConnection net TCP sk on "receive" function sck c print c end sk connect "www.adafruit.com" sk send "GET /testwifi/index.html HTTP/1.1\\r\\nHost: www.adafruit.com\\r\\nConnection: keep-alive\\r\\nAccept: */*\\r\\n\\r\\n" © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 30 of 42
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: Click here to download the CP2104 USB Driver https://adafru.it/vrf Download the CP2104 Legacy USB Driver https://adafru.it/ymF Install the Arduino IDE 1.6.8 or greater 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) © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 31 of 42
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. Visit our guide for how to add new boards to the Arduino 1.6.4+ IDE for more info about adding third party boards Next, use the Board manager to install the ESP8266 package. © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 32 of 42
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 HUZZAH ESP8266 from the Tools->Board dropdown
80 MHz as the CPU frequency
at "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) © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 33 of 42
The matching COM port for your FTDI or USB-Serial cable Blink Test We'll begin with the simple blink test Enter this into the sketch window (and save since you'll have to) Now you can simply upload! The Feather HUZZAH has built in auto-reset that puts it into bootloading mode automagically void setup pinMode OUTPUT void loop digitalWrite HIGH delay 500 digitalWrite LOW delay 500 © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 34 of 42
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 © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 35 of 42
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 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 void loop delay 5000 value Serial print "connecting to " Serial println host // Use WiFiClient class to create TCP connections WiFiClient client const int httpPort 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" © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 36 of 42
Open up the IDE serial console at 115200 baud to see the connection and webpage printout! © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 37 of 42
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! © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 38 of 42
Datasheets & Files AP2112K-3.3V regulator onboard CP2104 USB-to-Serial converter EagleCAD PCB Files on GitHub Fritzing object in Adafruit Fritzing Library Feather HUZZAH ESP8266 Pinout Diagram https://adafru.it/z4d More info about the ESP8266 ESP8266 specification sheet FCC test report for the module used on this breakout CE test report for the module used on this breakout Huuuuge amount of information on http://www.esp8266.com/ community forum! NodeMCU (Lua for ESP8266) webpage with examples and documentation on the Lua framework Arduino IDE support for ESP8266 Don't forget to visit esp8266.com for the latest and greatest in ESP8266 news, software and gossip! Schematic Click to enlarge Fabrication Print Dimensions in inches © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 39 of 42
© Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 40 of 42
ESP8266 F.A.Q. When I connect stuff to some of the pins, the Huzzah stops working. Whats up with that? The ESP8266 uses some of the pins as 'boot mode' pins so on boot they must be set to certain values: CH_PD (EN) should be always pulled high (it will disable the entire module if low) RST should be always pulled high (it will disable the entire module if low) GPIO 0 sets whether the bootloader is active, it must be pulled HIGH during power up/reset for the user program to run. If it's pulled LOW, it will activate the bootloader. The built-in red LED on #0 pulls it up GPIO 2 must be pulled high on power up/reset. GPIO 15 must be pulled low on power up/reset. My Huzzah board keeps crashing and resetting, whats up with that? The most common reason for crashes is power failure. Make sure you're powering the Huzzah with a good ~5V power supply, and if you're using a USB-Serial cable, that it's plugged into the mainboard of your computer or through a powered hub! I can't seem to find the Serial port on my computer for the Feather HUZZAH? Don't forget to install the CP2104 VCP drivers for your computer, they are required! I still can't seem to find the Serial port on my computer for the Feather Huzzah! Many cheap electronics come with charge-only USB cables, which cause headaches later. Make sure you are using a proper data/sync USB cable. If you find a cable that is charge-only (not data/sync also) throw it out so you don't have the same problem again. So, I’m getting a 'no such file' error compiling for ESP8266 on my Mac If your error message looks like this: fork/exec /Users/xxxxxxx/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9- 2/bin/xtensa-lx106-elf-g++: no such file or directory Error compiling. To fix this problem, do this: Open the Boards Manager in the Arduino IDE Uninstall the ESP8266 support go to your ~LIbrary folder (in the Finder, select "Go::Go to folder:, and enter ~Library ). Find the folder Arduino15. In the Arduino15 folder, go into packages, and delete the folder esp8266 Go back to the Arduino IDE, and install ESP8266 board support. Now go back to the Finder, and check that you have the xtensa-lx106-elf-g++ file in the path Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-g++ That's it! Whenever I start or reset the ESP8226 there's a bunch of "gibberish" on the Serial console This is the ROM debug messages, it's transmitted at 74880 baud so you rarely see it in proper 'ascii output' - instead usually it gets corrupted into a bunch of strange characters. I'm having difficulties uploading to the HUZZAH with the Arduino IDE Make sure you're using a good quality USB/Serial cable. Install the official drivers for that cable too! We've also © Adafruit Industries https://learn.adafruit.com/adafruit-feather-huzzah-esp8266 Page 41 of 42
noticed that PL2303-based cables don't work on Macs for some reason. FTDI or CP210x based chipsets work best I tried that, but I'm still having difficulties uploading with the Arduino IDE Sometimes, it helps to switch the board type to "Generic ESP8266 Module". Set the Reset Method to "nodemcu" See this forum post I'm stuck in bootloader mode and can't upload You say your led is stuck on dim and you get an error trying to upload? And you're sure your serial cable is connected and working correctly? Well, here's a potential fix: Connect the GPIO0 pin to GND through a 220 ohm resistor. Leave it connected while you upload. You may have to try it a couple of times, but it should eventually upload and get the HUZZAH unstuck from bootload mode! You can then remove the resistor connection, and your HUZZAH will be happy ever after! (Note: you may also have to tie RST and EN (CH_PD) together to get this to work. Remove the connection once you have the module programmed). Thanks to forum user misslevania for the tip I can't get Lua to respond to my commands Make sure your terminal software is sending correct line endings! The default PuTTY settings may be wrong when trying to talk to Lua on an ESP8266. Lua expects CRLF "\\r\\n" line endings, and apparently PuTTY defaults to just LF "\\n"! © Adafruit Industries Last Updated: 2018-01-11 03:27:00 PM UTC Page 42 of 42