ESP8266 Wifi Relay Module

ESP8266 Wifi Relay Module 

Smart Home Remote Control Phone On Off Lamp Socket Boiler Door Lock Irrigation Aquarium Greenhouse IoT Wireless Switch Mains 220V

IMPORTANT: The ESP-01S WiFi module is not included with the product. If you do not have an ESP-01S, you must also purchase that module. The ESP-01S is a product that needs to be programmed; if you are not familiar with programming products such as Arduino, it would be appropriate not to buy this product.

     The ESP-01S Wifi Relay Module is a 5V powered, 1 channel relay board into which the ESP-01S WiFi module plugs directly. It is the optocoupler version shown in the 1st picture. The board is powered with 5V; its AMS1117 regulator produces 3.3V for the ESP-01S. The GPIO0 pin of the ESP-01S energises the relay at low level (LOW) through an optocoupler and a driver transistor; the relay contacts switch loads of up to 10A 250VAC / 10A 30VDC.

     The board carries a 2x4 female socket for the ESP-01S, a 3-way screw terminal for the relay output (NO, COM, NC), a 2-way screw terminal for the 5V supply, an RST button that restarts the ESP-01S and a status LED. With the program you load onto the ESP-01S, the relay is switched on and off over WiFi from a mobile phone or a computer; devices such as a desk lamp, room light, socket or door lock are controlled wirelessly.

     Measuring about 37mm x 25mm, the board is suitable for smart home, remote control and IoT (internet of things) projects, and for building a WiFi switch or socket by placing it in a small enclosure.

Key features:

     ESP-01S plugs in directly: Thanks to the 2x4 female socket the ESP-01S module plugs in without soldering, and can be removed for programming and plugged back in.

     Single 5V supply: The on-board AMS1117 regulator produces the 3.3V supply of the ESP-01S from 5V; no separate 3.3V source is needed.

     Optocoupler relay drive: The GPIO0 signal reaches the relay through an optocoupler and a driver transistor; the relay energises at LOW level.

     10A relay output: The NO, COM, NC terminals are brought out to a screw terminal; the contacts switch loads of up to 10A 250VAC or 10A 30VDC.

     RST button and LED: The on-board button restarts the ESP-01S and the LED shows the status.

Features:

• Product type: 1 channel WiFi relay board for ESP-01S (optocoupler version)
• Model: ESP-01S Wifi Relay Module
• Compatible module: ESP-01S (not included in the package)
• Supply voltage: DC 5V
• ESP-01S supply: 3.3V from the on-board AMS1117 regulator
• Relay control pin: ESP-01S GPIO0
• Trigger: Low level (relay energises while GPIO0 is LOW)
• Relay drive: Through an optocoupler and a driver transistor
• Relay: Songle SRD-03VDC-SL-C (board in the product picture)
• Relay contact rating: up to 10A 250VAC, 10A 125VAC, 10A 30VDC, 10A 28VDC
• Relay output: NO (normally open), COM (common), NC (normally closed)
• Connection: 3-way screw terminal (relay output), 2-way screw terminal (5V supply)
• ESP-01S socket: 2x4 female pin socket, 2.54mm
• Button: RST (ESP-01S restart)
• Indicator: On-board status LED
• Colour: Blue PCB
• Dimensions: about 37mm x 25mm x 17mm
• Weight: about 16gr

Usage information:

• First load your program that drives the relay with GPIO0 onto the ESP-01S (with a USB-TTL converter or an ESP-01 programmer), then plug the module into the 2x4 socket on the board with its antenna facing outward.
• Power the board with DC 5V through the 2-way terminal. The board is used with 5V power supplies; a 5V adapter that can supply at least 500mA is recommended so that WiFi transmission is not interrupted.
• When your program sets GPIO0 LOW the relay energises (COM-NO closes), and when it sets it HIGH the relay releases (COM-NC closes). The relay is wired in series in the device's supply line like a switch: connect the incoming line to COM and the wire going to the device to NO.

Areas of use:

•  Smart home and home automation
•  Lamp and lighting control
•  Switching sockets and small home appliances on and off from a phone
•  Boiler and thermostat remote control
•  Door lock and automatic door triggering
•  Garden and pot irrigation pump control
•  Aquarium light, heater and pump control
•  Greenhouse fan and heater control
•  Industrial IoT (internet of things) applications
•  Remote control and wireless switch projects

Precautions:

•  The ESP-01S WiFi module is not included in the package and must be programmed. The board does not work on its own with an ESP-01S that has no program loaded.
•  The board is designed for the ESP-01S. If it is used with the older ESP-01 module, note that the ESP-01 lacks the EN (CH_PD) and RST pull-up resistors of the ESP-01S; with an ESP-01 on this board the EN (CH_PD) pin may need to be pulled up to 3.3V with a 10k resistor.
•  Switching 220V mains voltage carries a risk of death. Make the connections with the power off, place the board in an insulated enclosure and leave no exposed conductors.
•  The relay contact rating is 10A maximum. Stay below this value with high inrush loads such as motors, heaters and compressors; use a contactor if necessary.
•  GPIO0 can change level briefly at power-up and during programming; the relay may click on and off briefly when power is applied. Take precautions for loads where this would be a problem.

Package contents:

•  1 Piece ESP-01S Wifi Relay Module (5V relay board)
•  Note: The ESP-01S WiFi module is not included in the package and must be purchased separately.