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$9.97

**High-Performance Microcontroller for Reliable Automation:** Equipped with an 8-bit high-performance microcontroller, this USB relay module ensures efficient and reliable home automation, perfect for smart home enthusiasts.
**Versatile Power Supply Options:** The module supports both USB and external 5V power supply, offering flexibility and reliable power management for seamless operation of up to four devices.
**Enhanced Safety with Overcurrent Protection:** Features built-in overcurrent protection and relay diode freewheel protection, ensuring safe and long-lasting use with a relay life of up to 100,000 cycles.
**User-Friendly Serial Control:** Easy setup with CH340 USB to serial port control chip and supports simple relay switch status checking with command: 0xFF, making it convenient for users to manage their devices.
**Compact Design with Clear Indicators:** The compact 56*63mm board includes power and relay status LED indicators, providing clear visual feedback and making it ideal for space-constrained installations.

Product description

FEATURES
1.Onboard 8-bit high-performance microcontroller chip;
2.Onboard CH340 USB to serial control chip;
3.Onboard power LED indicator and relay status LED indicator K light;
4.Support relay switch status query,query command:OXFF;
5.Onboard 85V,10A/250VAC,10A/30VDC relays,The electrical appliance has a long service life and can be connected continuously for 100,000 times;
6.Power supply voltage:5V,support USB power supply/external power supply switch;
7.Output type:relay switch signal;
8.The module has overcurrent protection and relay diode freewheelingprotection functions.
9.Board size:76.9*80.6MM

Onboard 8-bit microcontroller chip

Power LED indicator and relay status LED indicator

1	USB HOLDER:USB COMMUNICATION/POWER SUPPLY;
2	EXTERNAL POWER SUPPLY PORT:CONNECT TO DC5V POWER SUPPLY.DUE TO THE LIMITED OUTPUT CURRENT OF USB,IT IS RECOMMENDEDTO USE EXTERNAL POWER SUPPLY WHEN USING MULTIPLE RELAYS;
3	RELAY INDICATOR;

4	POWER INDICATOR.
5	installation of serial port driver:the driver of ch340 USB to serial port chip shall beinstalled for the first time.
6	open the serial port debugging software such as stc-isp and ssc0m32,select thebaud rate of 9600, and send the relay switching command in hexadecimal(HEX)formto open or close the corresponding relay. You can choose to send manually orautomatically.