unPhone 9

Development Board

Code name: unphone9

ESP32S3

unPhone 9 is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 8MB flash memory.

About unPhone 9

An advanced version of the unPhone series, featuring ESP32-S3 and enhanced communication capabilities.

Technical Specifications

Complete technical specification details for unPhone 9

Display

Type LCD

Size 3.5"

Resolution 320x480

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

LoRa Yes

Microcontroller

Model esp32s3

Clock Speed 240 MHz

Flash Size 8MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 25

Interrupts 46

Quick Setup

Copy-paste configs for unPhone 9 - auto‑generated from this board's exact hardware specs.

ESP32S3 240 MHz 8MB DIO Xtensa

In Arduino IDE 2 select Unphone9 from the esp32 by Espressif package. In PlatformIO use board = esp32-s3-devkitm-1. ESP32S3 · 240 MHz · 8MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Unphone9

CPU Frequency 240 MHz

Flash Size 8MB

Flash Mode DIO

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 "Unphone9" for the unPhone 9.

platformio.ini


[env:unphone9]
platform  = espressif32
board     = esp32-s3-devkitm-1
framework = arduino

; Exact hardware config for unPhone 9
board_build.mcu        = esp32s3
board_build.f_cpu      = 240000000L
board_build.flash_size = 8MB
board_build.flash_mode = dio
board_upload.flash_size = 8MB

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

esp32: block (YAML)


esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: arduino   # or "esp-idf"

# unPhone 9 - 240 MHz ESP32S3
# Flash: 8MB | USB: N/A

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

esptool.py - flash command


esptool.py \
  --chip esp32s3 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 8MB \
    0x0 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x0

Useful Links

Datasheets and resources for unPhone 9

ESP32S3 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for unPhone 9

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
1	A0		PWM
2	A1	T1	PWM
3			PWM	SDA
4			PWM	SCL
5	A4	T4	PWM
6	A5	T5	PWM
7	A7	T7	PWM
8	A2	T2	PWM
9	A3	T3	PWM
12	A11	T11	PWM
13	A12	T12	PWM	LED_BUILTIN SS
14	A6 A13	T6 T13	PWM
15	A8 A14	T8 T14	PWM
16	A15		PWM
17	A16		PWM
18	A17		PWM
19	A18		PWM
20	A19		PWM
27	A10	T10	PWM
33	A9	T9	PWM
39			PWM	SCK
40			PWM	MOSI
41			PWM	MISO
43			PWM	TX
44			PWM	RX

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 unPhone 9

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x0`
Flash mode	dio
Boot mode	qio
PSRAM type	qspi
Maximum upload size	8128 KB (8323072 bytes)
Maximum data size	8512 KB (8716288 bytes)