ESP32-H2 Super Mini Development Board

Code name: ESP32H2_DEV

ESP32-H2 Super Mini development board is based on esp32h2 microcontroller and uses riscv32 architecture. This board has a maximum CPU frequency of 96 MHz and a flash size of 4MB.

⚡ Tech Specs 📌 Pinout 💡 On-Board LEDs 🔗 Useful Links 🗺️ Mappings 🛠️ Tools

About ESP32-H2 Super Mini

The ESP32-H2 SuperMini is an ultra-low-power IoT development board based on the Espressif ESP32-H2 chip. It features a 32-bit RISC-V single-core processor running at up to 96 MHz. The board integrates IEEE 802.15.4 support, making it compatible with Thread and Zigbee protocols for robust mesh networking. Additionally, it includes Bluetooth Low Energy (BLE) and operates in the 2.4 GHz band with a data rate of up to 250 Kbps. The ESP32-H2 SuperMini is designed for applications requiring low-power consumption, RF stability, and secure wireless communication, making it ideal for IoT, smart home, and industrial automation.

🆚 Wondering how the ESP32-S3 SuperMini compares to other SuperMini boards? Check out our full comparison guide to see how it stacks up against the C3, C3 Plus, C6, and H2.

Where to Buy

Starting from

5$ per unit

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Technical Specifications

🛰️ Connectivity

WiFi -

Bluetooth 5.0

BLE 5.0

🧠 Microcontroller

Model esp32h2

Clock Speed 96 MHz

Flash Size 4MB

Architecture riscv32

✨ Features

RISC-V 32-bit single-core CPU running at up to 96 MHz
128 KB ROM, 320 KB SRAM, 4 KB Low-Power SRAM
4 MB in-package flash memory
Supports IEEE 802.15.4 (Thread and Zigbee)
Bluetooth 5 Low Energy (BLE) support
Operates in the 2.4 GHz band with 250 Kbps data rate
USB Type-C interface for easy programming
Low-power consumption for battery-operated devices
11 digital IO pins
22 external interrupt pins
6 analog input pins
11 PWM pins

View Full Datasheet

ESP32-H2 Super Mini Pinout

The ESP32-H2 Super Mini pinout is optimized for low-power and wireless communication applications. It includes essential power pins such as 5V, 3.3V, and GND for stable operation.

The board provides communication interfaces like RX and TX for UART, SDA and SCL for I2C, and MISO, MOSI, SCK, and SS for SPI, ensuring seamless integration with external devices.

For wireless connectivity, the ESP32-H2 SuperMini supports IEEE 802.15.4 for Thread/Zigbee and Bluetooth Low Energy (BLE), making it an excellent choice for mesh networking applications.

✅ Safe Pins to Use

For general GPIO usage, these are the safest and most flexible choices:

🔹 IO10

🔹 IO11

🔹 IO12

🔹 IO13

🔹 IO14

🔹 IO22

Why Are These Pins Safe?

Not involved in bootstrapping → No impact on device boot mode or system startup
Not linked to flash memory or PSRAM → Won't interfere with storage or memory access
Not dedicated to USB or JTAG → Free for general use without affecting debugging
No special hardware connections → Freely assignable without internal conflicts

⚠️ Pins to Avoid or Use with Caution

Some pins are reserved for critical functions like bootstrapping, JTAG debugging, USB communication, and flash memory operations. Misusing these pins may lead to boot failures, programming issues, USB conflicts, or disruptions in flash storage.

Critical Pin Categories:

🛠️ Strapping Pins: Control boot behavior and flash voltage selection
🔗 JTAG Debugging Pins: Required for low-level debugging
🔌 USB Communication Pins: Used for USB Serial/JTAG communication
⚡ Flash Memory & SPI Pins: Connected to SPI flash memory and PSRAM
📡 UART Serial Communication Pins: Used for debugging and firmware uploads

PIN	Label	Reason	Function
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
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
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
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
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

ESP32-H2 Super Mini On-Board LEDs

The ESP32-H2 Supermini features three onboard LEDs: a green battery indicator, a user-controllable blue LED, and a WS2812 RGB LED. Note that the Blue LED and WS2812 share GPIO13 and GPIO8 respectively, and may interfere if both are driven simultaneously due to signal timing constraints.

🟢 Green LED – Battery Charge Indicator

GPIO: None
Control: Not controllable via GPIO
Behavior:

⚡ Charging → LED on
✅ Battery connected → LED off
🔋 No battery → LED blinks

🔵 Blue LED – User Controllable

GPIO: GPIO13
Control: digitalWrite(), ESPHome GPIO output

Arduino Example:


void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  delay(1000);
  digitalWrite(13, LOW);
  delay(1000);
}

ESPHome Example:


output:
  - platform: gpio
    pin: 13
    id: blue_led

light:
  - platform: binary
    name: "Blue LED"
    output: blue_led

ESPHome GPIO Output Documentation →

🌈 WS2812 LED – Programmable RGB

GPIO: GPIO8
Control: FastLED, NeoPixel, etc.

Arduino (FastLED) Example:

#include <FastLED.h>

#define NUM_LEDS 1
#define DATA_PIN 8

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
}

void loop() {
  leds[0] = CRGB::Red; FastLED.show(); delay(1000);
  leds[0] = CRGB::Green; FastLED.show(); delay(1000);
  leds[0] = CRGB::Blue; FastLED.show(); delay(1000);

ESPHome (NeoPixelBus) Example:

light:
  - platform: neopixelbus
    type: GRB
    pin: 8
    num_leds: 1
    name: "Onboard RGB LED"

ESPHome NeopixelBus Documentation →

ESP32-H2 Super Mini Useful Links

🔗 Datasheet

https://ae01.alicdn.com/kf/S37447fd3790641a98b4aeac9cacca163G.jpg

🔗 ESP32H2 Datasheet

https://www.espressif.com/sites/default/files/documentation/esp32-h2_datasheet_en.pdf

ESP32-H2 Super Mini Pin Mappings

This development board provides 11 digital IO pins, out of which 22 can be used as external interrupt pins , 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM) .

Pin	Function	ESP Pin	Input/Output	Description
1	5V	5V	power input	5V power input for the board
2	GND	GND	power ground	Ground connection
3	3V3	3.3V	power output	3.3V power output for peripherals
4	IO0	GP0	bidirectional	GPIO
5	IO1	GP1	bidirectional	GPIO, ADC pin
6	IO2	GP2	bidirectional	GPIO, ADC pin
7	IO3	GP3	bidirectional	GPIO, ADC pin
8	IO4	GP4	bidirectional	GPIO, ADC pin
9	IO5	GP5	bidirectional	GPIO, ADC pin
12	IO8	GP8	bidirectional	GPIO, LOG
13	IO9	GP9	bidirectional	GPIO, BOOT
14	IO10	GP10	bidirectional	GPIO
15	IO11	GP11	bidirectional	GPIO
16	IO12	GP12	bidirectional	GPIO
17	IO13	GP13	bidirectional	GPIO, LED
18	IO14	GP14	bidirectional	GPIO
19	IO22	GP2	bidirectional	GPIO
20	IO23	GP23	bidirectional	GPIO
22	IO25	GP25	bidirectional	GPIO
23	IO26	GP26	bidirectional	GPIO
24	IO27	GP27	bidirectional	GPIO

Function Pin Function

ESP Pin Pin on ESP32

I/O Input/Output Pin

Description Pin Description

ESP32-H2 Super Mini Pins Mapping Arduino IDE

Below you can find the ESP32-H2 Super Mini pinout. This development board provides 11 digital IO pins, out of which 22 can be used as external interrupt pins, 6 as analog input pins and 11 pins have Pulse-Width Modulation (PWM).

Pin	Analog	Other
0	A0
1	A1
2	A2
3	A3
4	A4	SCK
5	A5	MISO
6		MOSI
7		SS
8		SDA
9		SCL
20		RX
21		TX

Analog Analog input pins

Touch Touch pins

Function Function pins

RX / TX Receive/Transmit

LED_BUILTIN Built-in LED

PWM Pulse-Width Modulation

Default Tools

Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	0x0
Flash mode	qio
Boot mode	qio
Maximum upload size	1024 Kb (1048576 B)
Maximum data size	256 Kb (262144 B)

The ESP32-H2 Super Mini development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x0". Flash mode and boot mode for ESP32-H2 Super Mini development board by default is qio and qio respectively.

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