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u-blox NINA-W10 series (ESP32)
Industrial-grade ESP32 module with Wi-Fi and Bluetooth - built for rugged, reliable IoT devices.
14 × 10 mm
ESP32
MCU
240MHz
clock
2MB
flash
520KB
SRAM
24· 16 ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
24 pins| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | A11D7T1 | strapping | adc · touch | |
| 2 | 1 | TXD1PWM | uart | uart | |
| 3 | 2 | A12T2PWM | strapping | adc · touch | |
| 4 | 3 | RXD0PWM | uart | uart | |
| 5 | 4 | A10T0PWM | strapping | adc · touch | |
| 6 | 5 | SSD10PWM | strapping | spi | |
| 7 | 12 | SDAA15D15T5PWM | strapping | adc · touch · i2c | |
| 8 | 13 | SCLA14D14T4PWM | strapping | adc · touch · i2c | |
| 9 | 14 | A16D9T6PWM | strapping | adc · touch | |
| 10 | 15 | A13D8T3PWM | strapping | adc · touch | |
| 11 | 18 | SCKD13PWM | safe | spi | |
| 12 | 19 | MISOD11PWM | safe | spi | |
| 13 | 21 | LED_BLUED18PWM | safe | - | |
| 14 | 22 | D6PWM | safe | - | |
| 15 | 23 | LED_REDMOSID12PWM | safe | spi | |
| 16 | 25 | A18D3DAC1PWM | safe | adc · dac | |
| 17 | 26 | A19D2DAC2PWM | safe | adc · dac | |
| 18 | 27 | SW2A17D5T7PWM | safe | adc · touch | |
| 19 | 32 | A4D16T9PWM | safe | adc · touch | |
| 20 | 33 | LED_GREENSW1A5D17T8PWM | safe | adc · touch | |
| 21 | 34 | A6D19 | strapping | adc | |
| 22 | 35 | A7D4 | strapping | adc | |
| 23 | 36 | A0D20 | strapping | adc | |
| 24 | 39 | A3D21 | strapping | adc |
Start with these
10 pins with no boot or system involvementSCKD13MISOD11LED_BLUED18D6PWMLED_REDMOSIA18D3A19D2SW2A17A4D16LED_GREENSW1
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 |
|---|---|---|---|
| A11 | GPIO0 | Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode. | Strapping |
| A12 | GPIO2 | If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure. | Strapping |
| A10 | GPIO4 | Sampled at reset for boot config; should not be driven at boot (affects boot mode timing). | Strapping |
| SS | GPIO5 | Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot. | Strapping |
| SDA | MTDI (GPIO12) | Keep LOW during boot (internal PD); pulling HIGH at reset selects 1.8V flash mode, causing flash brownout if 3.3V flash is used. | Strapping |
| SCL | MTCK (GPIO13) | Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed. | Other |
| A16 | MTMS (GPIO14) | Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot. | Other |
| A13 | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| A6 | GPIO34 | Cannot be used as output (no drive capability); only suitable for analog/digital input. | Other |
| A7 | GPIO35 | Cannot be used as output; only suitable for input. | Other |
| A0 | GPIO36 (SENSOR_VP) | Cannot be used as output; only suitable for input (e.g., analog read). | Other |
| A3 | GPIO39 (SENSOR_VN) | Cannot be used as output; only suitable for input. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| TX | U0TXD (GPIO1) | Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console. | USB |
| RX | U0RXD (GPIO3) | Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads. | USB |
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 u-blox NINA-W10 series (ESP32) are usable GPIO. Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO12 and SCL on GPIO13; the…
All 24 pins on the u-blox NINA-W10 series (ESP32) are usable GPIO.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO12 and SCL on GPIO13; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
Beyond plain digital I/O you get 16 ADC-capable pins for sensors and battery monitoring, 10 capacitive-touch inputs and 2 true DAC outputs.
12 of the exposed pins carry boot-time or system duties on the ESP32 (A11, A12, A10 and 9 more) - check the guidance above before wiring anything to them. SCK, MISO, LED_BLUE, D6 and 6 more are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Serial chip: onboard. 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 GPIO18 - swap for your board's LED pin if different.
Board: Ublox Nina W10
Flash Size: 2MB · DIO
Upload Speed: 921600
// blink
pinMode(18, OUTPUT);
digitalWrite(18, LOW); // on (often inverted)[env:nina_w10]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32dev
variant: nina_w10
framework:
type: esp-idf
# blink - GPIO18
output:
- platform: gpio
pin: 18
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32 · 14 × 10 mmCompute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 2MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
24 · 16
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
-
Serial
-
Boot address
0x1000
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
14 × 10 mm
The u-blox NINA-W10 series (ESP32) uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with DIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.
About this board
At 14 × 10 mm it's the smallest ESP32 board we've measured.
Inside sits the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
At $99.00 it's on the expensive side for an ESP32 board - most land around $20.
- Certified ESP32 module (FCC, IC/ISED, RED/UKCA, MIC, NCC, KCC, ACMA, Anatel, ICASA)
- Industrial operating temperature range -40°C to +85°C
- ISO 16750 qualified for professional-grade use
- 2 MB flash, 448 KB ROM, no PSRAM
- Wi-Fi 802.11b/g/n and Bluetooth 4.2 (BR/EDR + low energy)
- Antenna variants: NINA-W101 (external/pin antenna, 10.0 x 10.6 mm), NINA-W102 (internal PIFA antenna, 10.0 x 14.0 mm), NINA-W106 (internal PCB trace antenna, 10.0 x 14.0 mm)
Where to buy
prices are typical street pricesu-blox NINA-W10 series (ESP32)
$99.00per unit, typical
Resources
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