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Adafruit Feather ESP32-S2 Reverse TFT
ESP32-S2 Feather board with a front-facing TFT - perfect for compact dashboards and visual projects.
52 × 23 mm
ESP32-S2
MCU
240MHz
clock
4MB
flash
320KB
SRAM
27· 6 ADC
GPIO
Wi-Fi
radio
Pinout
28 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 1 | NEOPIXEL_NUMPWM | safe | - | |
| 2 | 3 | SDAPWM | safe | i2c | |
| 3 | 4 | SCLPWM | safe | i2c | |
| 4 | 5 | T5PWM | safe | touch | |
| 5 | 6 | T6PWM | safe | touch | |
| 6 | 7 | TFT_I2C_POWERPWM | safe | - | |
| 7 | 8 | A5T8PWM | safe | adc · touch | |
| 8 | 9 | T9PWM | strapping | touch | |
| 9 | 10 | T10PWM | strapping | touch | |
| 10 | 11 | T11PWM | strapping | touch | |
| 11 | 12 | T12PWM | strapping | touch | |
| 12 | 13 | LED_BUILTINT13PWM | strapping | touch | |
| 13 | 14 | A4T14PWM | strapping | adc · touch | |
| 14 | 15 | A3PWM | strapping | adc | |
| 15 | 16 | A2PWM | strapping | adc | |
| 16 | 17 | A1DAC1PWM | safe | adc · dac | |
| 17 | 18 | A0DAC2PWM | safe | adc · dac | |
| 18 | 21 | NEOPIXEL_POWERPWM | safe | - | |
| 19 | 33 | PIN_NEOPIXELPWM | strapping | - | |
| 20 | 35 | MOSIPWM | strapping | spi | |
| 21 | 36 | SCKPWM | strapping | spi | |
| 22 | 37 | MISOPWM | strapping | spi | |
| 23 | 2 | RXPWM | uart | uart | |
| 24 | 1 | TXPWM | uart | uart | |
| 25 | 40 | TFT_DCPWM | strapping | - | |
| 26 | 41 | TFT_RSTPWM | strapping | - | |
| 27 | 42 | TFT_CSSSPWM | strapping | spi | |
| 28 | 45 | TFT_BACKLITEPWM | strapping | - |
Start with these
12 pins with no boot or system involvementNEOPIXEL_NUMPWMSDAPWMSCLPWMT5PWMT6PWMTFT_I2C_POWERPWMA5T8A1DAC1A0DAC2NEOPIXEL_POWERPWMRXPWMTXPWM
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| A3 | XTAL_32K_P | If an external 32 kHz crystal is used for RTC, this pin is dedicated to the crystal and cannot be used as GPIO. | Other |
| A2 | XTAL_32K_N | If using an external 32 kHz crystal, this pin is connected to the crystal and should not be used as general I/O. | Other |
| TFT_DC | MTDO | Part of JTAG interface (TDO); should be avoided as GPIO if JTAG debugging is needed. | Other |
| TFT_RST | MTDI | Part of JTAG interface (TDI); avoid using as GPIO to retain ability for JTAG debug. | Other |
| TFT_CS | MTMS | JTAG TMS pin; should not be repurposed if JTAG debugging or programming via JTAG is required. | Other |
| TFT_BACKLITE | GPIO45 | Must be set correctly at boot (usually low for 3.3 V); improper level can cause boot failure or flash malfunction. | Strapping |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| T9 | FSPIHD | Typically used as flash/PSRAM IO line in certain configurations; avoid using as GPIO if flash or PSRAM is present. | Flash |
| T10 | FSPICS0 | Often used as flash chip select in some designs; not available for GPIO when controlling flash. | Flash |
| T11 | FSPID | Used for flash data transfer in certain configurations; should be avoided for general use if flash is connected. | Flash |
| T12 | FSPICLK | Used as flash clock line in some boards; not free for GPIO if driving flash. | Flash |
| LED_BUILTIN | FSPIQ | Used for flash data output in certain configurations; avoid using as GPIO if connected to flash. | Flash |
| A4 | FSPIWP | Used as flash write-protect/data line on some modules; not recommended for other usage. | Flash |
| PIN_NEOPIXEL | SPIHD | Connected to SPI flash (hold/data line); not available for general-purpose use. | Flash |
| MOSI | FSPID | Used by internal flash/PSRAM on some ESP32-S2 variants; avoid using as GPIO to prevent conflicts. | Flash |
| SCK | FSPICLK | May be connected to internal flash or used for high-speed SPI; not intended for general GPIO use. | Flash |
| MISO | FSPIQ | Used for internal flash/PSRAM data in some models; should not be repurposed for GPIO. | Flash |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes The Adafruit Feather ESP32-S2 Reverse TFT pinout brings out 28 GPIO pins at a 2.54 mm pitch - every one of them usable in your project. For peripherals, I²C is…
The Adafruit Feather ESP32-S2 Reverse TFT pinout brings out 28 GPIO pins at a 2.54 mm pitch - every one of them usable in your project.
For peripherals, I²C is mapped to SDA on GPIO3 and SCL on GPIO4; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO1 and GPIO2 cover serial logging and flashing.
On the analog side there are 6 ADC-capable pins for sensors and battery monitoring, 9 capacitive-touch inputs and 2 true DAC outputs.
If you want zero surprises, NEOPIXEL_NUM, SDA, SCL, T5 and 8 more are free of any such role - the safest first picks. 6 of the exposed pins carry boot-time or system duties on the ESP32-S2 (A3, A2, TFT_DC and 3 more).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Native USB - no driver, no serial chip. Not detected? Hold BOOT while plugging in.
2
Flash with your tool
Arduino IDE, PlatformIO, ESPHome or esptool - copy the settings on the right.
3
Verify it runs
The blink example uses GPIO1 - swap for your board's LED pin if different.
Board: Adafruit Feather Esp32s2 Revtft
USB CDC On Boot: Enabled
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(1, OUTPUT);
digitalWrite(1, LOW); // on (often inverted)[env:adafruit_feather_esp32s2_reversetft]
platform = espressif32
board = esp32-s2-saola-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-s2-saola-1
variant: adafruit_feather_esp32s2_reversetft
framework:
type: esp-idf
# blink - GPIO1
output:
- platform: gpio
pin: 1
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32s2 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32-S2 · 52 × 23 mmCompute
MCU
ESP32-S2
Clock
240 MHz
SRAM · Flash
320 KB · 4MB · 2MB PSRAM
Radio
Wi-Fi
802.11 b/g/n 2.4 GHz
Bluetooth
-
Antenna
PCB
I/O
GPIO · ADC
27 · 6
UART · I²C · SPI
2 · 1 · 4
PWM
8 channels
Power
USB
USB-C
Serial
Native (CDC)
Boot address
0x1000
Display
Screen
TFT · 1.14" · 240x135
Driver
ST7789
Touch
No
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · QIO
Sketch · Data
1.25 MB · 320 KB
52 × 23 mm · pin pitch 2.54 mm
The Adafruit Feather ESP32-S2 Reverse TFT uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with QIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.
About this board
At its core is the ESP32-S2 - a single-core Xtensa with native USB-OTG and no Bluetooth.
Expect to pay about $24.95 - above the ~$20 typical for ESP32-S2 boards.
Onboard you'll find 2MB PSRAM, a TFT 1.14" 240x135 display, a STEMMA QT connector, an addressable RGB LED (GPIO33), a battery fuel gauge (MAX17048), battery charging via JST-PH 2.0, status LEDs (On, Charge, User (D13)) and Reset/D0/D1/D2 buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-S2 boards.
- Also sold in a u.FL external-antenna variant (product
- Early units shipped with an LC709203F fuel gauge instead of the MAX17048
- Reverse-mounted display sits on the same face as the three user buttons
Where to buy
prices are typical street pricesAdafruit Feather ESP32-S2 Reverse TFT
$24.95per unit, typical
Resources
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