Features:

1. Onboard mature and stable ESP-12F WIFI module, large capacity 4M BYTE FLASH;
2. The I/O port of the WIFI module and the UART program download port are all lead out to facilitate secondary development;
3. Onboard AC-DC switching power supply module, the power supply mode supports AC90-250V/DC7-30V/5v;
4. Onboard WIFI module RST reset button;
5. ESP-12F supports the use of development tools such as ECLIPSE/ARDUIN0 IDE and provides reference programs for the  development environment;
6. Onboard 4-channel 5V relays output switching signals, suitable for controlling loads with operating voltages within AC250V/Dc30V;
7. Onboard power indicator, 1 programmable LED and relay indicator.

Interface Description:

Programming port: GND, RX, TX, and 5V of ESP8266 are connected to GND, TX, RX, and 5V of the external TTL serial port module respectively. IO0 needs to be connected to GND when downloading. After the download is completed, disconnect the connection between IO0 and GND;

Relay output:

NC: Normally closed end, short-circuited to COM before the relay closes, and left floating after closing;
COM: public terminal;
NO: Normally open, the relay is left floating before closing, and short-circuited to COM after closing.
GPIO pinout port introduction

ARDUIN0 development environment setup:

ESP8266 supports development tools such as ECLIPSE/ARDUINOIDE. Using it is relatively simple. The following is how to set up the development environment:

1. Install ARDUIN0 IDE 1.8.9 or the latest version;
2. Open ARDUIN0 IDE and click File on the menu bar--

Preferences, enter the preferences and click to add the URL in 'Additional Development Board Manager URL'

3. Click Tools--Development Board--Development Board Manager in the menu bar.

Then search for 'ESP8266' and install ARDUIN0's support package 2.5.2 or the latest version for ESP8266.

Note: Since the download URL is from abroad and the access speed is relatively slow, download errors may occur. Just try a few more times when the network is good.

Program download:

1. Use a jumper cap/Dupont line to connect the IO0 and GND pins, prepare a TTL serial port module (for example: FT232) and plug it into the computer USB. The connection method between the serial port module and the development board is as follows:
2. Click Tools-Development Board in the menu bar and select the development board as ESPINO (ESP-12 MODULE).
3. Open the program you want to download, click Tools--Port on the menu bar and select the correct port number.
4. After clicking 'Upload', the program will be automatically compiled and downloaded to the development board, as follows:
5. Finally, disconnect IO0 and GND, power on the development board again or press the reset button to run the program.

Package includes:

1x Relay module