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Deneyap Mini
ESP32-S2 board for education and prototyping - offers basic I/O and USB support in a compact format.
50 × 20.32 mm
ESP32-S2
MCU
240MHz
clock
4MB
flash
320KB
SRAM
24· 7 ADC
GPIO
Wi-Fi
radio
Pinout
24 pins · 2.54 mm pitch| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | GPKEYD13 | strapping | - | |
| 2 | 8 | A0T0PWM | safe | adc · touch | |
| 3 | 9 | A1T1PWM | strapping | adc · touch | |
| 4 | 10 | A2T2PWM | strapping | adc · touch | |
| 5 | 11 | A3T3PWM | strapping | adc · touch | |
| 6 | 12 | A4T4PWM | strapping | adc · touch | |
| 7 | 13 | A5T5PWM | strapping | adc · touch | |
| 8 | 16 | A6PWM | strapping | adc | |
| 9 | 17 | D12DAC0PWM | safe | dac | |
| 10 | 18 | D11DAC1PWM | safe | dac | |
| 11 | 21 | SSD10PWM | safe | spi | |
| 12 | 26 | D9PWM | strapping | - | |
| 13 | 33 | LEDGD15PWM | strapping | - | |
| 14 | 34 | LEDRD16PWM | strapping | - | |
| 15 | 35 | LED_BUILTINLEDBD14PWM | strapping | - | |
| 16 | 36 | SDAD8PWM | strapping | i2c | |
| 17 | 37 | SCLD7PWM | strapping | i2c | |
| 18 | 38 | SCKD6PWM | strapping | spi | |
| 19 | 39 | MISOD5PWM | strapping | spi | |
| 20 | 40 | MOSID4PWM | strapping | spi | |
| 21 | 41 | D3PWM1PWM | strapping | - | |
| 22 | 42 | D2PWM0PWM | strapping | - | |
| 23 | 43 | TXD1PWM | uart | uart | |
| 24 | 44 | RXD0PWM | uart | uart |
Start with these
6 pins with no boot or system involvementA0T0D12DAC0D11DAC1SSD10TXD1RXD0
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 |
|---|---|---|---|
| GPKEY | GPIO0 | Must be pulled high for normal boot; pulling low at reset enters bootloader (download mode). Also serves as SPI flash data-in (SPID) line when using external flash memory. | Strapping |
| A6 | 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 |
| MISO | MTCK | Used for JTAG debugging interface; using this pin for other purposes will disable JTAG clock input. | Other |
| MOSI | MTDO | Part of JTAG interface (TDO); should be avoided as GPIO if JTAG debugging is needed. | Other |
| D3 | MTDI | Part of JTAG interface (TDI); avoid using as GPIO to retain ability for JTAG debug. | Other |
| D2 | MTMS | JTAG TMS pin; should not be repurposed if JTAG debugging or programming via JTAG is required. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| A1 | FSPIHD | Typically used as flash/PSRAM IO line in certain configurations; avoid using as GPIO if flash or PSRAM is present. | Flash |
| A2 | FSPICS0 | Often used as flash chip select in some designs; not available for GPIO when controlling flash. | Flash |
| A3 | FSPID | Used for flash data transfer in certain configurations; should be avoided for general use if flash is connected. | Flash |
| A4 | FSPICLK | Used as flash clock line in some boards; not free for GPIO if driving flash. | Flash |
| A5 | FSPIQ | Used for flash data output in certain configurations; avoid using as GPIO if connected to flash. | Flash |
| D9 | SPICS1 | Used to connect external PSRAM (or second SPI memory); should be avoided as GPIO if such memory is present. | Flash |
| LEDG | SPIHD | Connected to SPI flash (hold/data line); not available for general-purpose use. | Flash |
| LEDR | SPIWP | Connected to SPI flash (write-protect/data line); not recommended for other use. | Flash |
| LED_BUILTIN | FSPID | Used by internal flash/PSRAM on some ESP32-S2 variants; avoid using as GPIO to prevent conflicts. | Flash |
| SDA | FSPICLK | May be connected to internal flash or used for high-speed SPI; not intended for general GPIO use. | Flash |
| SCL | FSPIQ | Used for internal flash/PSRAM data in some models; should not be repurposed for GPIO. | Flash |
| SCK | FSPIWP | Reserved for flash/PSRAM in ESP32-S2 modules with internal memory; not recommended for general I/O. | 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 All 24 pins on the Deneyap Mini are usable GPIO, spaced at the standard 2.54 mm pitch. Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO36 and…
All 24 pins on the Deneyap Mini are usable GPIO, spaced at the standard 2.54 mm pitch.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO36 and SCL on GPIO37; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO43 and GPIO44 cover serial logging and flashing.
Beyond plain digital I/O you get 7 ADC-capable pins for sensors and battery monitoring, 6 capacitive-touch inputs and 2 true DAC outputs.
6 of the exposed pins carry boot-time or system duties on the ESP32-S2 (GPKEY, A6, MISO and 3 more) - check the guidance above before wiring anything to them. A0, D12, D11, SS and 2 more are free of any such role - the safest first picks.
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 GPIO8 - swap for your board's LED pin if different.
Board: Dym
USB CDC On Boot: Enabled
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(8, OUTPUT);
digitalWrite(8, LOW); // on (often inverted)[env:deneyapmini]
platform = espressif32
board = esp32-s2-saola-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-s2-saola-1
variant: deneyapmini
framework:
type: esp-idf
# blink - GPIO8
output:
- platform: gpio
pin: 8
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 · 50 × 20.32 mmCompute
MCU
ESP32-S2
Clock
240 MHz
SRAM · Flash
320 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n 2.4 GHz
Bluetooth
-
Antenna
PCB
I/O
GPIO · ADC
24 · 7
UART · I²C · SPI
2 · 1 · 4
PWM
8 channels
Power
USB
Micro-USB
Serial
Native (CDC)
Boot address
0x1000
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · QIO
Sketch · Data
1.25 MB · 320 KB
50 × 20.32 mm · pin pitch 2.54 mm
The Deneyap Mini 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
Inside sits the ESP32-S2 - a single-core Xtensa with native USB-OTG and no Bluetooth.
At $5.37 it's cheaper than most ESP32-S2 boards, which usually run around $20.
Around the module: status LEDs (RGB) and GPKEY buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-S2 boards.
Where to buy
prices are typical street pricesDeneyap Mini
$5.37per unit, typical
Resources
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