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WR3 Wi-Fi Module

by Tuya Inc.

Product page

Parameter Value
Board code wr3
MCU RTL8710BN
Manufacturer Realtek
Series AmebaZ
Frequency 125 MHz
Flash size 2 MiB
RAM size 256 KiB
Voltage 3.0V - 3.6V
I/O 11x GPIO, 6x PWM, 2x UART, 2x ADC
Wi-Fi 802.11 b/g/n
FCC ID 2ANDL-WR3

Usage

Board code: wr3

In platformio.ini:

[env:wr3]
platform = libretuya
board = wr3
framework = arduino

In ESPHome YAML:

libretuya:
  board: wr3
  framework:
    version: dev

Pinout

Pinout

Arduino Core pin mapping

No. Pin UART IĀ²C SPI PWM Other
D0 PA22 UART0_RTS I2C0_SCL SPI0_MISO, SPI1_MISO PWM5
D1 PA19 UART0_CTS I2C0_SDA SPI0_CS, SPI1_CS
D2 PA14 PWM0 SWCLK
D3 PA15 PWM1 SWDIO
D4 PA00 PWM2
D5 PA29 UART2_RX I2C0_SCL PWM4
D6 PA30 UART2_TX I2C0_SDA PWM4
D7 PA05 PWM4
D8 PA12 PWM3
D9 PA18 UART0_RX I2C1_SCL SPI0_SCK, SPI1_SCK
D10 PA23 UART0_TX I2C1_SDA SPI0_MOSI, SPI1_MOSI PWM0
A0 PA19, ADC1
A1 ADC2

Flash memory map

Flash size: 2 MiB / 2,097,152 B / 0x200000

Hex values are in bytes.

Name Start Length End
Boot XIP 0x000000 16 KiB / 0x4000 0x004000
Boot RAM 0x004000 16 KiB / 0x4000 0x008000
(reserved) 0x008000 4 KiB / 0x1000 0x009000
System Data 0x009000 4 KiB / 0x1000 0x00A000
Calibration 0x00A000 4 KiB / 0x1000 0x00B000
OTA1 Image 0x00B000 788 KiB / 0xC5000 0x0D0000
OTA2 Image 0x0D0000 788 KiB / 0xC5000 0x195000
Key-Value Store 0x195000 24 KiB / 0x6000 0x19B000
User Data 0x19B000 400 KiB / 0x64000 0x1FF000
RDP 0x1FF000 4 KiB / 0x1000 0x200000

RDP is most likely not used in Tuya firmwares, as the System Data partition contains an incorrect offset 0xFF000 for RDP, which is in the middle of OTA2 image.

Additionally, Tuya firmware uses an encrypted KV or file storage, which resides at the end of flash memory. This seems to overlap system RDP area.