Onehorse ESP32 Dev Module

Development Board

Code name: ONEHORSE_ESP32_DEV

ESP32

Onehorse ESP32 Dev Module is a development board based on the ESP32 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About Onehorse ESP32 Dev Module

Compact ESP32 dev module with integrated power features - designed for embedded and wearable use.

Technical Specifications

Complete technical specification details for Onehorse ESP32 Dev Module

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 4.2

BLE 4.2

Microcontroller

Model esp32

Clock Speed 240 MHz

Flash Size 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 40

Analog Input 16

PWM 17

Interrupts 16

Download Full Datasheet

Quick Setup

Copy-paste configs for Onehorse ESP32 Dev Module - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 4MB DOUT Xtensa

In Arduino IDE 2 select Onehorse Esp32 Dev from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DOUT.

Tools menu settings

Board (select in Arduino IDE) Onehorse Esp32 Dev

CPU Frequency 240 MHz

Flash Size 4MB

Flash Mode DOUT

Upload Speed 921600

Architecture Xtensa

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Onehorse Esp32 Dev" for the Onehorse ESP32 Dev Module.

platformio.ini


[env:onehorse32dev]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for Onehorse ESP32 Dev Module
board_build.mcu        = esp32
board_build.f_cpu      = 240000000L
board_build.flash_size = 4MB
board_build.flash_mode = dout
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32dev
  framework:
    type: arduino   # or "esp-idf"

# Onehorse ESP32 Dev Module - 240 MHz ESP32
# Flash: 4MB | USB: N/A

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32 \
  --baud 921600 \
  write_flash \
    --flash_mode dout \
    --flash_size 4MB \
    0x1000 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x1000

Useful Links

Datasheets and resources for Onehorse ESP32 Dev Module

Board Datasheet

Technical specifications

ESP32 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for Onehorse ESP32 Dev Module

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
0	A11	T1		KEY_BUILTIN
1			PWM	TX
2	A12	T2	PWM
3			PWM	RX
4	A10	T0	PWM
5			PWM	LED_BUILTIN SS
12	A15	T5	PWM
13	A14	T4	PWM
14	A16	T6	PWM
15	A13	T3	PWM
18			PWM	SCK
19			PWM	MISO
21			PWM	SDA
22			PWM	SCL
23			PWM	MOSI
25	A18		PWM	DAC1
26	A19		PWM	DAC2
27	A17	T7	PWM
34	A6
35	A7
36	A0
37	A1
38	A2
39	A3

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for Onehorse ESP32 Dev Module

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x1000`
Flash mode	dout
Boot mode	dio
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)