Adafruit AirLift Shield ESP32 Manuel utilisateur
Adafruit AirLift Shield - ESP32 WiFi Co-Processor
Created by Brent Rubell
Last updated on 2021-03-29 01:04:51 PM EDT
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Guide Contents
Guide Contents
Overview
Pinouts
Power Pins
SPI Interface Pins
ESP32 Control Pins
SD Card Interface
LEDs
Prototyping Area
Assembly
Installing Standard Headers
Stack Alert!
CircuitPython WiFi
CircuitPython Microcontroller Pinout
CircuitPython Installation of ESP32SPI Library
CircuitPython Usage
Internet Connect!
What's a secrets file?
Connect to WiFi
Requests
HTTP GET with Requests
HTTP POST with Requests
Advanced Requests Usage
WiFi Manager
CircuitPython BLE
CircuitPython BLE UART Example
Adafruit AirLift ESP32 Shield Wiring
Update the AirLift Firmware
Install CircuitPython Libraries
Install the Adafruit Bluefruit LE Connect App
Copy and Adjust the Example Program
Talk to the AirLift via the Bluefruit LE Connect App
Arduino WiFi
Library Install
First Test
Arduino Microcontroller Pin Definition
WiFi Connection Test
Secure Connection Example
JSON Parsing Example
Adapting Other Examples
Upgrade External ESP32 Airlift Firmware
External AirLift FeatherWing, Shield, or ItsyWing
Upload Serial Passthrough code for Feather or ItsyBitsy
External AirLift Breakout
Code Usage
Install esptool.py
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 2 of 56
Overview
Give your Arduino project a
lift
with the Adafruit AirLift Shield (https://adafru.it/F6v) - a shield that lets you
use the powerful ESP32 as a WiFi or BLE co-processor. You probably have your favorite Arduino-
compatible (like the Metro M4 (https://adafru.it/A5S) or the classic Metro
328 (https://adafru.it/METROXMETR)) that comes with its own set of awesome peripherals and lots of
libraries. But it doesn't have WiFi or BLE 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 it's
using the latest TLS/SSL encryption (it has root certificates pre-burned in).
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 4 of 56
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. Send basic but powerful socket-based commands over 8MHz
SPI for high speed data transfer. You can use any 3V or 5V Arduino, any chip from the ATmega328 and up
(although the '328 will not be able to do very complex tasks or buffer a lot of data). It also works great with
CircuitPython, a SAMD51/Cortex M4 minimum required since we need a bunch of RAM. All you need is the
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. You use a few control pins and the RXI and
TXO pins to talk to the ESP32 when it's in BLE mode.
We placed an ESP32 module on a shield with a separate 3.3V regulator, and a tri-state chip for MOSI so
you can share the SPI bus with other shields. We also tossed on a micro SD card socket, you can use that
to host or store data you get from the Internet. Arduinos based on the ATmega328 (like the UNO) cannot
use both the WiFi module and SD library at the same time, they don't have enough RAM. Again, we
recommend an M0 or M4 chipset for use with Arduino, M4 for CircuitPython!
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 5 of 56
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 (https://adafru.it/Evl). We also include some
header so you can solder it in and plug right into your Arduino-compatible, but you can also pick up a set
of stacking headers to stack above/below your board.
We've tested this with all our Metros and it should work just fine with them except the Metro M4
Airlifts (https://adafru.it/F6o) (because they already have WiFi!). For use in Arduino , the '328 and '32u4 you
can do basic connectivity and data transfer but they do not have a lot of RAM so we don't recommend
them - use the Metro M0, M4 or similar, for best results! For CircuitPython use, a Metro M4 works best -
the M0 series does not have enough RAM in CircuitPython.
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 6 of 56
Pinouts
There's a lot jam-packed into this shield! Let's take a look at what we've got going on.
Power Pins
GND - Common power/logic ground.
3V - this is the output from the 3.3V regulator. The regulator can supply 500mA peak but half of that
is drawn by the ESP32, and it's a fairly power-hungry chip.
5V - This is the input to the regulator
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 8 of 56
IOr - This is IORef, the IO voltage we will communicate with and is required.
SPI Interface Pins
Both ESP32 and SD card use SPI to send and receive data. These pins are labeled CLK MISO MOSI and
have level shifting so you can use this shield with 3.3V or 5V microcontroller boards.
By default the 2x3 pin ICSP header on the right hand side is where the SPI signals are found.
ESP32 Control Pins
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 9 of 56
Required Control Pins:
BUSY - this pin is an input from the AirLift, it will let us
know when its ready for more commands to be sent.
This is 3.3V logic out, can be read by 3-5V logic. This
pin
must
be connected.
RST- this pin is an output to the AirLift. Set low to put the
AirLift into reset. You should use this pin, even though
you might be able to run for a short while without it, it's
essential to 'kick' the chip if it ever gets into a locked up
state. Level shifted so can be 3-5V logic
Optional Control Pins:
GPIO0 - this is the ESP32 GPIO0 pin, which is used to
put it into bootloading mode. It is also used if you like
when the ESP32 is acting as a server, to let you know
data is ready for reading. IIt's not required for WiFi, but
you'll need to connect it to use BLE mode. Solder the
pad on the bottom of the shield to connect it.
RX & TX - Serial data in and Serial data out, used for
bootloading new firmware, and for communication when
in BLE mode. Leave disconnected if not using BLE or
when not uploading new WiFi firmware to the AirLift
(which is a rare occurrence). You'll need to solder the
two pads on the bottom of the shield to use these pins.
SD Card Interface
There's a lot of space available on this shield so we also stuck
on a micro SD card holder, great for datalogging or storing
data to transmit over WiFi.
In addition to the shared SPI pins, the SD (chip select) pin is
also used. It can be re-assigned to any pin by cutting the trace
underneath the board and rewiring. If the SD card is not used,
the SD pin can be used for any other purpose
LEDs
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 10 of 56
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