ESP8266 ESP-01S WiFi Relay Module

The ESP8266 ESP-01S WiFi Relay Module is a compact wireless control board that combines the ESP-01S WiFi microcontroller with a relay driver circuit. It allows remote switching of AC or DC loads over WiFi using simple AT commands or custom firmware. The module supports easy integration with IoT systems, home automation projects, and wireless control applications.

This relay module is suitable for smart home lighting control, appliance switching, remote power control, and embedded WiFi projects. Its ESP-01S based connectivity and relay output make it ideal for wireless automation with smartphones, web interfaces, or cloud platforms.

KEY FEATURES

• Integrated ESP8266 ESP-01S WiFi controller
• Built-in relay for load switching
• Wireless control via WiFi network
• Supports AT commands and custom firmware
• Compact PCB module
• Works with 3.3V power supply
• Suitable for IoT and automation projects
• Easy microcontroller integration

SPECIFICATIONS

• WiFi Chip = ESP8266 ESP-01S
• WiFi Standard = IEEE 802.11 b/g/n
• Operating Voltage = 3.3V DC
• Relay Voltage/Current = Typical relay rating 5V coil, load depends on relay
• Communication = WiFi 2.4GHz
• GPIO = ESP-01S pins for control
• Mounting Type = PCB module

INTERFACES

• VCC = 3.3V power input
• GND = Ground
• TX = UART transmit
• RX = UART receive
• GPIO0 = General IO / flash mode
• GPIO2 = General IO
• RELAY = Relay output contact common
• NO = Relay normally open output
• NC = Relay normally closed output