# Adafruit Airlift Bitsy Add-On - ESP32 WiFi Co-Processor ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/080/455/medium800thumb/adafruit_products_4363.jpg?1567623171) Give your ItsyBitsy project a lift with the Adafruit AirLift Bitsy Add-On! This sweet add-on for the ItsyBitsy lets you use the powerful ESP32 as a WiFi or BLE co-processor. You probably have your favorite ItsyBitsy ([like the ItsyBitsy M4](https://www.adafruit.com/product/3800)) that comes with its own set of awesome peripherals and lots of libraries. But it doesn't have WiFi built in! So let's give that chip a best friend, the ESP32. This chip can handle all the heavy lifting of connecting to a WiFi network and transferring data from a site, even if its using the latest TLS/SSL encryption (it has root certificates pre-burned in). ![](https://cdn-learn.adafruit.com/assets/assets/000/080/353/medium800/adafruit_products_iso_main_crop.png?1567539026) Having WiFi managed by a separate chip means your code is simpler, you don't have to cache socket data, or compile in & debug an SSL library. Instead the Airlift Add-On allows you to send basic but powerful socket-based commands over 8MHz SPI for high speed data transfer. You can use the 3V 32u4, M0, or M4 ItsyBitsy in  Arduino although **the '32u4 will not be able to do very complex tasks or buffer a lot of data ** because they do not have a lot of RAM. The add-on also works great with CircuitPython, though a SAMD51/Cortex M4 minimum required since we need a bunch of RAM. All you need is an SPI bus and 2 control pins plus a power supply that can provide up to 250mA during WiFi usage. The ESP32 also supports BLE (Bluetooth Low Energy), though not simultaneously with WiFi. Many of our CircuitPython builds include native support for ESP32 BLE. Right now, we only support the ESP32 acting as a BLE peripheral, but that's sufficient to communicate with the ESP32 from a phone, tablet, host computer, or another BLE-capable board. You use a few control pins and the RX and TX pins to talk to the ESP32 when it's in BLE mode.  ![](https://cdn-learn.adafruit.com/assets/assets/000/080/354/medium800/adafruit_products_4363_kit_orig_2019_09.jpg?1567539112) We placed an ESP32 module on a BitsyWing with a tri-state chip for MOSI so you can share the SPI bus. The add on comes fully assembled and tested, pre-programmed with ESP32 SPI WiFi co-processor firmware that [you can use in CircuitPython to use this into  WiFi co-processsor over SPI + 2 pins](https://github.com/ladyada/Adafruit_CircuitPython_ESP32SPI). We also toss in some header so you can solder it in though  **you'll need stacking headers for your ItsyBitsy to put the add-on on top.** [The firmware on board is a slight variant of the Arduino WiFiNINA core, which works great!](https://github.com/adafruit/nina-fw)  ![](https://cdn-learn.adafruit.com/assets/assets/000/080/355/medium800/adafruit_products_4363_quarter_orig_2019_09.jpg?1567539292) - [Next Page](https://learn.adafruit.com/adafruit-airlift-bitsy-add-on-esp32-wifi-co-processor/pinouts.md) ## Primary Products ### Adafruit AirLift Bitsy Add-On – ESP32 WiFi Co-Processor [Adafruit AirLift Bitsy Add-On – ESP32 WiFi Co-Processor](https://www.adafruit.com/product/4363) Give your ItsyBitsy project a _lift_ with the Adafruit AirLift Bitsy Add-On - a daughterboard that lets you use the powerful ESP32 as a WiFi co-processor. You probably have your favorite ItsyBitsy ([like the Itsy' M4](https://www.adafruit.com/product/3800)) that comes... In Stock [Buy Now](https://www.adafruit.com/product/4363) [Related Guides to the Product](https://learn.adafruit.com/products/4363/guides) ## Featured Products ### Adafruit ItsyBitsy M4 Express featuring ATSAMD51 [Adafruit ItsyBitsy M4 Express featuring ATSAMD51](https://www.adafruit.com/product/3800) What's smaller than a Feather but larger than a Trinket? It's an **Adafruit ItsyBitsy M4 Express** featuring the **Microchip ATSAMD51**! Small, powerful, with a ultra fast ATSAMD51 Cortex M4 processor running at 120 MHz - this microcontroller board is perfect... Out of Stock [Buy Now](https://www.adafruit.com/product/3800) [Related Guides to the Product](https://learn.adafruit.com/products/3800/guides) ### Adafruit ItsyBitsy M0 Express - for CircuitPython & Arduino IDE [Adafruit ItsyBitsy M0 Express - for CircuitPython & Arduino IDE](https://www.adafruit.com/product/3727) What's smaller than a Feather but larger than a Trinket? It's an **Adafruit ItsyBitsy M0 Express**! Small, powerful, with a rockin' ATSAMD21 Cortex M0 processor running at 48 MHz - this microcontroller board is perfect when you want something very compact, but still... In Stock [Buy Now](https://www.adafruit.com/product/3727) [Related Guides to the Product](https://learn.adafruit.com/products/3727/guides) ### Adafruit ItsyBitsy 32u4 - 3V 8MHz [Adafruit ItsyBitsy 32u4 - 3V 8MHz](https://www.adafruit.com/product/3675) What's smaller than a Feather but larger than a Trinket? It's an Itsy Bitsy! Small, powerful, Arduino-compatible - this microcontroller board is perfect when you want something very compact, but still with a bunch of pins. Itsy Bitsy is only 1.4" long by 0.7" wide, but... In Stock [Buy Now](https://www.adafruit.com/product/3675) [Related Guides to the Product](https://learn.adafruit.com/products/3675/guides) ### Stacking Headers for Feather - 12-pin and 16-pin female headers [Stacking Headers for Feather - 12-pin and 16-pin female headers](https://www.adafruit.com/product/2830) These two **Female Stacking Headers** alone are, well, lonely. But pair them with any of our [Feather](https://www.adafruit.com/categories/777) boards and you're in business! What do they do? They stack. Put the headers through your Feather and then you can... Out of Stock [Buy Now](https://www.adafruit.com/product/2830) [Related Guides to the Product](https://learn.adafruit.com/products/2830/guides) ### Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy [Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy](https://www.adafruit.com/product/2124) If you have an ItsyBitsy or Pro Trinket you probably know it's the perfect little size for a portable project. This LiPoly backpack makes it really easy to do! Instead of wiring 2 or 3 boards together to make a charging system, this little PCB sits on top of the PCB and allows a... In Stock [Buy Now](https://www.adafruit.com/product/2124) [Related Guides to the Product](https://learn.adafruit.com/products/2124/guides) ## Related Guides - [Introducing ItsyBitsy 32u4](https://learn.adafruit.com/introducting-itsy-bitsy-32u4.md) - [Introducing ItsyBitsy M0 Express](https://learn.adafruit.com/introducing-itsy-bitsy-m0.md) - [Adafruit Audio FX Sound Board](https://learn.adafruit.com/adafruit-audio-fx-sound-board.md) - [CircuitPython Essentials](https://learn.adafruit.com/circuitpython-essentials.md) - [Infinity Mirror Collar](https://learn.adafruit.com/infinity-mirror-collar.md) - [Cup o' Sound](https://learn.adafruit.com/cup-o-sound.md) - [Tent Lantern](https://learn.adafruit.com/tent-lantern.md) - [Rezz-Inspired NeoPixel Glasses](https://learn.adafruit.com/rezz-inspired-neopixel-glasses.md) - [How to train new TensorFlow Lite micro speech models](https://learn.adafruit.com/how-to-train-new-tensorflow-lite-micro-speech-models.md) - [Electronic Animated Eyes for ARM Microcontrollers](https://learn.adafruit.com/animated-electronic-eyes.md) - [Portable Mini Timelapse Camera](https://learn.adafruit.com/portable-mini-timelapse-camera.md) - [Neopixel Cosmic Turtle Necklace](https://learn.adafruit.com/neopixel-led-magnetic-pendant-necklace.md) - [A NeoPixel Pomodoro Timer](https://learn.adafruit.com/a-neopixel-pomodoro-timer.md) - [Zelda: Breath of the Wild – 3D Printed Guardian Sword with NeoPixel LEDs](https://learn.adafruit.com/breath-of-the-wild-guardian-sword-led-3d-printed.md) - [Esenciales para CircuitPython](https://learn.adafruit.com/esenciales-para-circuitpython.md) - [Trinket “Question Block” Sound Jewelry](https://learn.adafruit.com/trinket-question-block-sound-jewelry.md)