Adafruit ESP32-S2 Feather with BME280 Sensor - STEMMA QT
2 grouped connections are listed in the table but omitted from the graphic until individual pins are available.
USB-C port used for both powering and programming the board; USB power also charges the LiPoly battery when connected.
2-pin JST-PH battery connector for a 3.7/4.2V LiPoly battery; can power the Feather and charge from USB.
Common ground for power and logic.
Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery.
Positive voltage to/from the USB-C jack when USB is connected.
3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator.
Output from the onboard 3.3V regulator; Adafruit states these pins can supply 500mA peak.
Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
Analogue input pins; Adafruit states A2 through A5 can be analog inputs.
SPI clock pin on the ESP32-S2 high-speed peripheral.
SPI microcontroller-out / sensor-in data pin.
SPI microcontroller-in / sensor-out data pin.
UART receive pin; connect to TX on a sensor or breakout.
UART transmit pin; connect to RX on a sensor or breakout.
I2C clock pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
I2C data pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
STEMMA QT connector uses board.SCL and board.SDA / board.STEMMA_I2C for I2C devices.
I2C power control pin that must be pulled high for the STEMMA QT connector and the BME280 sensor, if present, to work properly; CircuitPython and Arduino do this automatically.
Digital pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, and D11-D13 are on ADC2.
Hardware UART debug TX pin for ESP32 IDF low-level debug output; not the default Serial.print or CircuitPython print output.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| USB-C | Power | USB-C port used for both powering and programming the board; USB power also charges the LiPoly battery when connected. | USB 5V input from the USB-C jack when connected. |
| LiPoly JST 2-PH | Power | 2-pin JST-PH battery connector for a 3.7/4.2V LiPoly battery; can power the Feather and charge from USB. | 3.7/4.2V LiPoly battery connection; Adafruit says use 250mAh or larger. |
| GND | Ground | Common ground for power and logic. | 0V common ground. |
| BAT | Power | Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery. | Battery positive, 3.7/4.2V LiPoly domain. |
| USB | USB | Positive voltage to/from the USB-C jack when USB is connected. | USB positive voltage, nominal 5V. |
| EN | Control | 3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator. | 3.3V regulator enable logic. |
| 3.3V | Power | Output from the onboard 3.3V regulator; Adafruit states these pins can supply 500mA peak. | 3.3V regulated output. |
| A0 | Analog | Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs. | |
| A1 | Analog | Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs. | |
| A2-A5 | Analog | Analogue input pins; Adafruit states A2 through A5 can be analog inputs. | |
| SCK | SPI | SPI clock pin on the ESP32-S2 high-speed peripheral. | |
| MOSI | SPI | SPI microcontroller-out / sensor-in data pin. | |
| MISO | SPI | SPI microcontroller-in / sensor-out data pin. | |
| RX | UART | UART receive pin; connect to TX on a sensor or breakout. | |
| TX | UART | UART transmit pin; connect to RX on a sensor or breakout. | |
| SCL | I2C | I2C clock pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin. | |
| SDA | I2C | I2C data pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin. | |
| STEMMA QT | I2C | STEMMA QT connector uses board.SCL and board.SDA / board.STEMMA_I2C for I2C devices. | |
| I2C_POWER | Power | I2C power control pin that must be pulled high for the STEMMA QT connector and the BME280 sensor, if present, to work properly; CircuitPython and Arduino do this automatically. | |
| D5-D6, D9-D13 | GPIO | Digital pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, and D11-D13 are on ADC2. | |
| Debug TXDB | UART | Hardware UART debug TX pin for ESP32 IDF low-level debug output; not the default Serial.print or CircuitPython print output. |
2 grouped connections are omitted from the graphic until individual pins are available.
USB-C port used for both powering and programming the board; USB power also charges the LiPoly battery when connected.
2-pin JST-PH battery connector for a 3.7/4.2V LiPoly battery; can power the Feather and charge from USB.
Common ground for power and logic.
Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery.
Positive voltage to/from the USB-C jack when USB is connected.
3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator.
Output from the onboard 3.3V regulator; Adafruit states these pins can supply 500mA peak.
Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
Analogue input pins; Adafruit states A2 through A5 can be analog inputs.
SPI clock pin on the ESP32-S2 high-speed peripheral.
SPI microcontroller-out / sensor-in data pin.
SPI microcontroller-in / sensor-out data pin.
UART receive pin; connect to TX on a sensor or breakout.
UART transmit pin; connect to RX on a sensor or breakout.
I2C clock pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
I2C data pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
STEMMA QT connector uses board.SCL and board.SDA / board.STEMMA_I2C for I2C devices.
I2C power control pin that must be pulled high for the STEMMA QT connector and the BME280 sensor, if present, to work properly; CircuitPython and Arduino do this automatically.
Digital pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, and D11-D13 are on ADC2.
Hardware UART debug TX pin for ESP32 IDF low-level debug output; not the default Serial.print or CircuitPython print output.
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