FeatherWing add-on that uses an ESP32 module as a TLS-capable WiFi co-processor, communicating with the host Feather over SPI. Pre-loaded root certificates handle HTTPS; the Feather itself provides the application logic.
Common power and logic ground.
Positive voltage from the Feather JST connector for an optional LiPo battery.
Positive voltage to or from the Micro USB jack when connected.
3.3V regulator enable; Adafruit says it is pulled up and can be connected to ground to disable the regulator.
3.3V regulator output for the FeatherWing; Adafruit notes the regulator can supply 500mA peak, with substantial current used by the ESP32.
SPI clock from the microcontroller to the AirLift.
SPI data from the AirLift to the microcontroller; tri-stated when not selected.
SPI data to the AirLift from the microcontroller.
SPI chip select from the microcontroller to start sending commands to the AirLift.
Required AirLift ready/busy signal to tell the microcontroller when more commands can be sent.
Required reset control to the AirLift; set low to reset the co-processor.
Optional ESP32 GPIO0 bootloading/server-ready signal; Adafruit says it is required for BLE mode and connected by solder pad.
Optional serial receive pin for the ESP32 co-processor.
Optional serial transmit pin for the ESP32 co-processor.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| GND | Ground | Common power and logic ground. | |
| BAT | Power | Positive voltage from the Feather JST connector for an optional LiPo battery. | |
| USB | USB | Positive voltage to or from the Micro USB jack when connected. | |
| EN | Control | 3.3V regulator enable; Adafruit says it is pulled up and can be connected to ground to disable the regulator. | |
| 3V | Power | 3.3V regulator output for the FeatherWing; Adafruit notes the regulator can supply 500mA peak, with substantial current used by the ESP32. | 3.3V output per Adafruit pinouts |
| SCK | SPI | SPI clock from the microcontroller to the AirLift. | 3-5V logic input supported per Adafruit pinouts |
| MISO | SPI | SPI data from the AirLift to the microcontroller; tri-stated when not selected. | 3.3V logic output, readable by 3-5V logic per Adafruit pinouts |
| MOSI | SPI | SPI data to the AirLift from the microcontroller. | 3-5V logic input supported per Adafruit pinouts |
| ESPCS | Signal | SPI chip select from the microcontroller to start sending commands to the AirLift. | 3-5V logic input supported per Adafruit pinouts |
| ESPBUSY | Signal | Required AirLift ready/busy signal to tell the microcontroller when more commands can be sent. | 3.3V logic output, readable by 3-5V logic per Adafruit pinouts |
| ESPRST | Control | Required reset control to the AirLift; set low to reset the co-processor. | 3-5V logic input supported per Adafruit pinouts |
| ESPGPIO0 | Control | Optional ESP32 GPIO0 bootloading/server-ready signal; Adafruit says it is required for BLE mode and connected by solder pad. | |
| ESPRX | Signal | Optional serial receive pin for the ESP32 co-processor. | |
| ESPTX | Signal | Optional serial transmit pin for the ESP32 co-processor. |
Common power and logic ground.
Positive voltage from the Feather JST connector for an optional LiPo battery.
Positive voltage to or from the Micro USB jack when connected.
3.3V regulator enable; Adafruit says it is pulled up and can be connected to ground to disable the regulator.
3.3V regulator output for the FeatherWing; Adafruit notes the regulator can supply 500mA peak, with substantial current used by the ESP32.
SPI clock from the microcontroller to the AirLift.
SPI data from the AirLift to the microcontroller; tri-stated when not selected.
SPI data to the AirLift from the microcontroller.
SPI chip select from the microcontroller to start sending commands to the AirLift.
Required AirLift ready/busy signal to tell the microcontroller when more commands can be sent.
Required reset control to the AirLift; set low to reset the co-processor.
Optional ESP32 GPIO0 bootloading/server-ready signal; Adafruit says it is required for BLE mode and connected by solder pad.
Optional serial receive pin for the ESP32 co-processor.
Optional serial transmit pin for the ESP32 co-processor.
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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