{"product_id":"5v-7-28v-power-supply-8-channel-esp8266-wifi-8-way-relay-module-esp-12f-development-board-secondary","title":"5V\/7-28V Power Supply 8 Channel ESP8266 WIFI 8-way Relay Module ESP-12F Development Board Secondary","description":"\u003cp\u003e\u003cb\u003eNote:?\u003c\/b\u003eThis product cannot be used directly, it is suitable for ESP8266 secondary development learning, beginners pay attention!\u003c\/p\u003e  \u003cp\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e  \u003cp\u003e\u003cb\u003eFeature:\u003c\/b\u003e\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003eOnboard mature and stable ESP-12F WiFi module, large capacity 4M Byte Flash\u003c\/p\u003e  \u003cp\u003ePower supply mode supports DC7-28V\/5V\u003c\/p\u003e  \u003cp\u003eOnboard WIFI module RST reset button\u003c\/p\u003e  \u003cp\u003eESP-12F supports the use of development tools such as Eclipse\/Arduino lDE\u003c\/p\u003e  \u003cp\u003eProvide reference program under Arduin0 development environment\u003c\/p\u003e  \u003cp\u003eOnboard 8 5V relays, output switch signals, suitable for controlling loads whose working voltage is within AC 250V\/DC30V\u003c\/p\u003e  \u003cp\u003eOnboard power indicator and relay indicator\u003c\/p\u003e  \u003cp\u003eProduct specifications\u003c\/p\u003e  \u003cp\u003eBoard size: 149*80mm\u003c\/p\u003e  \u003cp\u003eWeight: 140g\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003e\u003cb\u003ePackage includes:\u003c\/b\u003e\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003e1 x?8-way Relay Module\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003eProgramming port: ESP8266`s GND, RX, TX, 5V are respectively connected to the external TTL serial port module GND, TX, RX, 5V, IO0 must be connected to GND when downloading, and then disconnect the connection between IO0 and GND after the download is complete;\u003c\/p\u003e  \u003cp\u003eRelay output:\u003c\/p\u003e  \u003cp\u003eNC: Normally closed, the relay is short-connected with COM before the pull-in, and hangs in the air after pull-in;\u003c\/p\u003e  \u003cp\u003eCOM: public end;\u003c\/p\u003e  \u003cp\u003eNO: Normally open end, the relay is suspended before being closed, and shorted to COM after being closed.\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003e\u003cb\u003eGPIO lead port introduction:\u003c\/b\u003e\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003ctable border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"794\" height=\"152\" style=\"width:\"\u003e   \u003ccolgroup\u003e    \u003ccol width=\"132\" span=\"2\" style=\"width:\"\u003e    \u003ccol width=\"528\" style=\"width:\"\u003e   \u003c\/colgroup\u003e   \u003ctbody\u003e    \u003ctr height=\"20\" style=\"height:\"\u003e     \u003ctd class=\"et3\" height=\"20\" width=\"132\" style=\"height:\"\u003e\n\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg width=\"1\" height=\"1\"\u003e\u003cimg 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