WR4 Reset & Teardown (FCC ID 2ANDL-WR4)

Before you buy the Tuya Global WR4, check what's inside.

The WR4 is a low-power WiFi module from Tuya, designed for integration into smart home devices. It features an ARM CM4F processor and supports standard Wi-Fi protocols for connectivity.

⚠️ NOTE: Handle with care, requires proper integration into mains-powered devices. Ensure correct voltage is supplied.

Quick Specs

Manufacturer: Tuya Global
Model: WR4
Protocol: WiFi
Chipset: Realtek RTL8720
Ecosystem: Tuya / Smart Life
App: Smart Life

🔧 Geek Corner (Flashing Info)

Chipset: W302 12E77H2
Flashable: ❌ No
Info: Manufacturer explicitly states 'Not Flashable' and uses proprietary chipset.

User Manual

Scanned pages from the official user manual:

WR4 Manual

External Photos

Photos of the device exterior:

WR4 Exterior

Internal Photos

Teardown photos showing the PCB and components:

WR4 PCB

Verdict

The WR4 is a WiFi device from the Tuya / Smart Life ecosystem.

📄 Click to view full text manual (SEO)

WR4DATASHEET
Tuya Smart Wi-Fi Module 
1. Product Overview
WR4 is a low power consumption module with built-in connectivity solution designed by
Hangzhou Tuya Information Technology Co., Ltd.The Wi-Fi Module consists of a highly 
integrated wireless 
radio chip W302 12E77H2 and some extra flash that has been programed with 
Wi-Fi network protocol and plenty 
of software examples.WR4 includea ARM CM4F,WLAN 
MAC,1T1R WLAN,maximum frequency reaches 125MHz,256K SRAM,2M byte flash and 
various peripheral resources.
WR4 is a RTOS platform, embedded with all the Wi-Fi MAC and TCP/IP protocol function 
examples, users can customize their Wi-Fi product by using these software examples. 
1.1 Features 
 Integrated low power consumption 32-bit CPU, also known as application processor
 Basic frequency of the CPU can support 125 MHz
Supply voltage : 3.3V
 Peripherals: 7 GPIO channels, 2 UART, 1 ADC
 Wi-Fi connectivity:
 802.11 B/G/N20/N40
Channel 1 to 11 @ 2.4GHz
 Support WPA/WPA2
+24.5 dBm output power
 Support SmartConfig function for both Android and IOS devices

WR4DATASHEET
External IPEX connecter antenna
 Operating temperature range: -20℃ to 85℃
1.2 Main ApplicationFields 
 Intelligent Building
 Intelligent home, Intelligent household applications
 Healthy devices
 Industrial wireless control
 Baby monitor
 Webcam
 Intelligent bus
WR4DATASHEET
2. Dimensions and Footprint
2.1Dimensions 
WR4 has 2 columns of Pins (2*8).The distance between each Pin is 1.5 mm. 
Size of WR4: 13.8mm(W)*15.5mm(L)*3.3mm(H) 
Figure 2 shows the dimensions of WR4. 
Figure 2. The dimensions of WR4 
2.2 Pin Definition 
Table 1 shows the generalpin attributes of WR4 
Table 1. The typical pin definitionof WR4 
PIN
NO.
NAME TYPE DISCREPTION
1 NC / NC ，No Connect 
2 ADC AI ADCterminal(input5Vmaximally)
3 EN I/O Externalresetsingal(lowleveleffects)
4 A_19 I/O GPIOA_19 
5 A_12 I/O GPIOA_12 
6 A_0 I/O GPIOA_0,cannotbepull‐upwhilebooting,canbeusedasGPIO
whileinnormalworkingmode
7 A_5 I/O GPIOA_15
8 3.3V I/O Supplyvoltage(3.3V)
9 GND I/O Ground
10 A_23 I/O UART0_TXD

WR4DATASHEET
11 A_18 I/O UART0_RXD
12 A_22 I/O GPIOA_22
13 A_15 I/O GPIOA_15
14 A_14 I/O GPIOA_14
15 A_29 I/O UART_Log_RXD(usedtoprintmodule'sinternalinformation)
16 A_30 I/O UART_Log_TXD(usedtoprintmodule'sinternalinformation)
Note: S
: Power supply pins; I/O: Digital input or output pins; AI: Analog input. 
WR4DATASHEET
3. Electrical Characteristics
3.1 Absolute Maximum Ratings 
Table 3.1. Absolute Maximum Ratings 
PARAMETERS DESCRIPTION MIN MAX UNIT
Ts Storagetemperature‐ 40 105 ℃
VCC Supplyvoltage ‐0.3 3.6 V
Staticelectricityvoltage
(humanmodel)
TAMB‐25℃ ‐ 2 KV
Staticelectricityvoltage
(machinemodel)
TAMB‐25℃ ‐ 0.5 KV
3.2 Electrical Conditions 
Table 3.2. Electrical Conditions 
PARAMETERS DESCRIPTION MIN TYPICAL MAX UNIT
Ta Workingtemperature ‐20 ‐ 85 ℃
VCC Workingvoltage 3 ‐ 3.6 V
VIL IOlowlevelinput ‐0.3‐ VCC*0.25 V
VIH IOhighlevelinput VCC*0.75 ‐ VCC V
VOL IOlowleveloutput ‐ ‐ VCC*0.1 V
VoH IOhighleveloutput VCC*0.8‐ VCC V...