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Espressif ESP32-H2-DevKitM-1
Official ESP32-H2 dev board with 802.15.4 and BLE - perfect for Zigbee, Thread, and secure IoT development.
48.26 × 25.4 mm
ESP32-H2
RISC-V MCU
96MHz
clock
4MB
flash
320KB
SRAM
19· 5 ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
30 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 3V33.3V | power | - | 3.3V regulated output |
| 2 | - | RSTEN | control | - | Chip reset (active low) |
| 3 | 0 | IO0 | strapping | pwm | Fast SPI FSPIQ |
| 4 | 1 | IO1A1 | strapping | adc · pwm | ADC1_CH0; FSPICS0 |
| 5 | 2 | IO2A2 | strapping | adc · pwm | ADC1_CH1; JTAG MTMS; FSPIWP |
| 6 | 3 | IO3A3 | strapping | adc · pwm | ADC1_CH2; JTAG MTDO; FSPIHD |
| 7 | 13 | IO13 | safe | pwm | 32.768 kHz crystal XTAL_32K_P |
| 8 | 14 | IO14 | safe | pwm | 32.768 kHz crystal XTAL_32K_N |
| 9 | 4 | IO4A4 | strapping | adc · pwm | ADC1_CH3; JTAG MTCK; FSPICLK |
| 10 | 5 | IO5A5 | strapping | adc · pwm | ADC1_CH4; JTAG MTDI; FSPID |
| 11 | - | NC | - | Not connected | |
| 12 | - | VBAT3V3 | power | - | Battery / RTC 3.3V input |
| 13 | - | GND | ground | - | Ground |
| 14 | - | 5V | power | - | 5V input (from USB) / output |
| 15 | - | GND | ground | - | Ground |
| 16 | - | GND | ground | - | Ground |
| 17 | 24 | IO24TX | uart | uart · pwm | UART0 TX; FSPICS2 |
| 18 | 23 | IO23RX | uart | uart · pwm | UART0 RX; FSPICS1 |
| 19 | 10 | IO10 | safe | pwm | Zero-crossing detector ZCD0 |
| 20 | 11 | IO11 | safe | pwm | Zero-crossing detector ZCD1 |
| 21 | 25 | IO25 | strapping | pwm | Fast SPI FSPICS3 |
| 22 | 12 | IO12 | safe | pwm | General-purpose GPIO |
| 23 | 8 | IO8 | strapping | pwm | Onboard RGB LED; ROM boot log (LOG) |
| 24 | 22 | IO22 | safe | pwm | General-purpose GPIO |
| 25 | - | GND | ground | - | Ground |
| 26 | 9 | IO9 | strapping | pwm | BOOT button |
| 27 | - | GND | ground | - | Ground |
| 28 | 27 | IO27 | uart | pwm | USB D+ (native USB Serial/JTAG); FSPICS5 |
| 29 | 26 | IO26 | uart | pwm | USB D- (native USB Serial/JTAG); FSPICS4 |
| 30 | - | GND | ground | - | Ground |
Start with these
6 pins with no boot or system involvementIO13IO14IO10IO11IO12IO22
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 |
|---|---|---|---|
| IO24 | U0TXD | Often used for boot log output and serial debugging; repurposing it can disable serial output of boot messages and interfere with console debugging. | UART |
| IO23 | U0RXD | Often used for the serial console and bootloader input; repurposing it may conflict with UART communication for programming or debugging. | UART |
| IO25 | GPIO25 | Used during boot to determine the JTAG interface source; this pin has no internal pull-up/down, so it must not be left floating (an external resistor drives it high/low to avoid unintended JTAG mode selection). | Strapping |
| IO8 | GPIO8 | Must be held at the proper logic level on reset to select the correct boot mode and enable/disable bootloader log output. | Strapping |
| IO9 | GPIO9 | Must be pulled high on reset for normal SPI flash boot (pulling it low while GPIO8 is high forces the chip into download/programming mode). | Strapping |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| IO0 | GPIO0 | Connected to the external (or in-package) flash memory as a data line; cannot be repurposed without interfering with program storage. | Flash |
| IO1 | GPIO1 | Used to select the SPI flash chip (not brought out on modules with in-package flash); needed for flash access, so it should not be used as a general IO. | Flash |
| IO2 | MTMS | Serves as the flash memory’s write-protect pin and the JTAG TMS line; using it as GPIO can disrupt flash operation or JTAG debugging. | Flash |
| IO3 | MTDO | Serves as the flash HOLD (D3) line and the JTAG TDO output; repurposing it can interfere with flash reads/writes or JTAG debugging. | Flash |
| IO4 | MTCK | Acts as the SPI flash clock line and the JTAG clock; cannot be used as GPIO without halting flash operation or debug capability. | Flash |
| IO5 | MTDI | Functions as the flash data input (D0) line and JTAG TDI input; using it as GPIO will interfere with the flash data bus and JTAG functionality. | Flash |
| IO27 | USB_D+ | By default, this pin is connected to the internal USB Serial/JTAG controller; using it as a general-purpose IO would disable the USB functionality used for debugging/programming. | USB |
| IO26 | USB_D- | By default, this pin is connected to the chip’s internal USB Serial/JTAG peripheral; using it as a general-purpose IO requires disabling or reconfiguring that USB interface. | 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 Across 30 pins (2.54 mm pitch), the Espressif ESP32-H2-DevKitM-1 exposes 19 GPIO plus 3V3 , VBAT , GND and 5V for power. Peripheral wiring is straightforward:…
Across 30 pins (2.54 mm pitch), the Espressif ESP32-H2-DevKitM-1 exposes 19 GPIO plus 3V3, VBAT, GND and 5V for power.
Peripheral wiring is straightforward: TX/RX on GPIO24 and GPIO23 cover serial logging and flashing.
Beyond plain digital I/O you get 5 ADC-capable pins for sensors and battery monitoring and PWM on every GPIO.
5 of the exposed pins carry boot-time or system duties on the ESP32-H2 (IO24, IO23, IO25 and 2 more) - check the guidance above before wiring anything to them. IO13, IO14, IO10, IO11 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
Serial chip: CP2102N. 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 GPIO13 - swap for your board's LED pin if different.
Board: Esp32 H2 Devkitm 1
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(13, OUTPUT);
digitalWrite(13, LOW); // on (often inverted)[env:esp32-h2-devkitm-1]
platform = espressif32
board = esp32-h2-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-h2-devkitm-1
variant: esp32_h2_devkitm_1
framework:
type: esp-idf
# blink - GPIO13
output:
- platform: gpio
pin: 13
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32h2 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32-H2 · 48.26 × 25.4 mmCompute
MCU
ESP32-H2 · RISC-V
Clock
96 MHz
SRAM · Flash
320 KB · 4MB
Radio
Wi-Fi
-
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
19 · 5
UART · I²C · SPI
2 · 1 · 2
PWM
6 channels
Power
USB
USB-C (UART) · USB-C (native)
Serial
CP2102N
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
48.26 × 25.4 mm · pin pitch 2.54 mm
The Espressif ESP32-H2-DevKitM-1 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
Inside sits the ESP32-H2 - a Thread/Zigbee-focused RISC-V with no Wi-Fi at all.
Around the module: an addressable RGB LED (GPIO8) and Boot/Reset buttons.
- 802.15.4 radio for Thread, Zigbee and Matter plus Bluetooth 5 (LE); no Wi-Fi
- No PSRAM
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
