Description:
The ESP8266 eight way 30A relay development board is equipped with ESP-12F wifi module, with all I / O ports led out, and supports DC7-28V / 5V power supply mode. Provide Arduinodevelopment environment reference code, which is suitable for ESP8266 secondary development and learning, smart home wireless control and other occasions.

Features:
1. Onboard mature and stable ESP-12F WiFi module with large capacity of 4M byte flash
2. The I / O port and UART program download port of WiFi module are all led out to facilitate secondary development; 3. The power supply mode supports dc7-28v / 5V;
4. On board WiFi module RST reset key and a programmable key;
6. On board 8-way 5V / 30A relay, which outputs switching signal and is suitable for controlling loads with working voltage within AC 250V / DC30V
7. On board power indicator, relay indicator and led of one module;
8. Two on-board shift registers 74HC595 control the relay switch.

Package Include:
1x Relay Module Board

Writing port:

GND, Rx, TX and 5V of esp8266 are respectively connected to GND of external TTL serial port module, TX, Rx, 5V, IO0 needs to be connected with GND when downloading, and then disconnect the connection between IO0 and GND after downloading; Relay output:
NC: normally closed end, short circuited with com before the relay is pulled in & suspended after it is pulled in;
COM: public end;
No: normally open, the relay is suspended before closing, and is short circuited with com after closing.