Arduino-shield form-factor add-on that uses an ESP32 module as a TLS-capable WiFi co-processor, communicating with the host Arduino over SPI. Pre-loaded root certificates handle HTTPS; suitable for Metro, Uno, and compatible boards.
Common power/logic ground for the shield.
3.3 V regulator output. Adafruit states the regulator can supply 500 mA peak, with part of that used by the ESP32.
Input to the onboard regulator.
IORef voltage used for communication level reference.
Shared SPI clock for ESP32 AirLift and microSD interfaces; available on the 2x3 ICSP header by default with level shifting.
Shared SPI data from peripheral to host for ESP32 AirLift and microSD interfaces; level shifted.
Shared SPI data from host to peripheral for ESP32 AirLift and microSD interfaces; level shifted.
Required input from AirLift indicating when it is ready for more commands; Adafruit describes it as 3.3 V logic output readable by 3 to 5 V logic.
Required output to AirLift reset, driven low to reset the ESP32 co-processor; level shifted for 3 to 5 V logic.
Optional ESP32 GPIO0 / bootloading and BLE data-ready signal, connected by soldering the pad on the bottom of the shield.
Optional serial data input used for firmware bootloading and BLE-mode communication; requires soldering the underside pad.
Optional serial data output used for firmware bootloading and BLE-mode communication; requires soldering the underside pad.
microSD chip-select pin in addition to the shared SPI pins; Adafruit notes it can be reassigned by cutting the trace underneath and rewiring.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| GND | Arduino shield power header GND | Ground | Common power/logic ground for the shield. | |
| 3V | Arduino shield power header 3V | Power | 3.3 V regulator output. Adafruit states the regulator can supply 500 mA peak, with part of that used by the ESP32. | 3.3V |
| 5V | Arduino shield power header 5V | Power | Input to the onboard regulator. | 5V input |
| IOrIORef | Arduino shield power header IORef | Power | IORef voltage used for communication level reference. | |
| CLKSCK | 2x3 ICSP SPI header | SPI, Signal | Shared SPI clock for ESP32 AirLift and microSD interfaces; available on the 2x3 ICSP header by default with level shifting. | |
| MISO | 2x3 ICSP SPI header | SPI | Shared SPI data from peripheral to host for ESP32 AirLift and microSD interfaces; level shifted. | |
| MOSI | 2x3 ICSP SPI header | SPI | Shared SPI data from host to peripheral for ESP32 AirLift and microSD interfaces; level shifted. | |
| BUSY | ESP32 control pin breakout/header | Signal | Required input from AirLift indicating when it is ready for more commands; Adafruit describes it as 3.3 V logic output readable by 3 to 5 V logic. | 3.3V logic out, 3-5V readable |
| RST | ESP32 control pin breakout/header | Control | Required output to AirLift reset, driven low to reset the ESP32 co-processor; level shifted for 3 to 5 V logic. | 3-5V logic compatible |
| GPIO0 | Optional ESP32 control pad | GPIO | Optional ESP32 GPIO0 / bootloading and BLE data-ready signal, connected by soldering the pad on the bottom of the shield. | |
| RX | Optional serial control pad | UART | Optional serial data input used for firmware bootloading and BLE-mode communication; requires soldering the underside pad. | |
| TX | Optional serial control pad | UART | Optional serial data output used for firmware bootloading and BLE-mode communication; requires soldering the underside pad. | |
| SDCS | microSD control pin | SPI, Signal | microSD chip-select pin in addition to the shared SPI pins; Adafruit notes it can be reassigned by cutting the trace underneath and rewiring. |
Common power/logic ground for the shield.
3.3 V regulator output. Adafruit states the regulator can supply 500 mA peak, with part of that used by the ESP32.
Input to the onboard regulator.
IORef voltage used for communication level reference.
Shared SPI clock for ESP32 AirLift and microSD interfaces; available on the 2x3 ICSP header by default with level shifting.
Shared SPI data from peripheral to host for ESP32 AirLift and microSD interfaces; level shifted.
Shared SPI data from host to peripheral for ESP32 AirLift and microSD interfaces; level shifted.
Required input from AirLift indicating when it is ready for more commands; Adafruit describes it as 3.3 V logic output readable by 3 to 5 V logic.
Required output to AirLift reset, driven low to reset the ESP32 co-processor; level shifted for 3 to 5 V logic.
Optional ESP32 GPIO0 / bootloading and BLE data-ready signal, connected by soldering the pad on the bottom of the shield.
Optional serial data input used for firmware bootloading and BLE-mode communication; requires soldering the underside pad.
Optional serial data output used for firmware bootloading and BLE-mode communication; requires soldering the underside pad.
microSD chip-select pin in addition to the shared SPI pins; Adafruit notes it can be reassigned by cutting the trace underneath and rewiring.
About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.
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