View source for ESP-12F AC-DC Power Supply ESP8266 AC90-250V-DC7-12V-USB5V WIFI Single Relay Module Development Board

{{Header| ESP-12F AC-DC Power Supply ESP8266 AC90-250V-DC7-12V-USB5V WIFI Single Relay Module Development Board}}
== Feature ==

#  On-board mature and stable -12F WIFI module, large capacity 4M Byte Flash
# The I / O port and UART program download port of the WiFi module are all exported, which is convenient for secondary development.
# On-board AC-DC switching power supply module, power supply mode supports AC90-250V / DC7-12V / USB5V
# On-board WIFI module RST reset button
# -12F supports the use of development tools such as Eclipse / for Arduino IDE, and provides reference programs under the for Arduino development environment.
# One 5V relay on board, output switching signal, suitable for controlling load with working voltage within AC250V / DC30V
# Onboard power indicator, 1 programmable LED and relay indicator

== Function ==
[[File:ESP-12F AC-DC Power Supply ESP8266 AC90-250V-DC7-12V-USB5V WIFI Single Relay Module Development Board.png|center]]
# L, N: AC90-250V power supply
# AC90-250V to DC5V switching power supply (Do not touch here directly with your hand when using AC power supply !!!)
# VCC, GND: DC7-12V power supply;
# USB: DC5V USB power supply; Note: AC90-250V, DC7-12V, DC5VUSB can be selected as one of the three power supply methods.
# 6X6mm button: 8266 reset button;
# UART program download port: GND, RX, TX, 5V of 8266 are connected to GND, TX, RX, 5V of the external TTL serial module rectively. IO0 must be connected to GND when downloading, and then disconnected connection;
# GPIO pin out port;
# Relay output:
 Normally closed end, the relay is short-circuited to COM before pull-in, and suspended after pull-in;
 COM: public end;
 NO: Normally open, the relay is suspended before the pull-in, and shorted to COM after the pull-in.
# Power indication LED;
# Programmable LED;
# Relay Indication LED: Lights up during pull-in.

= Introduction to GPIO terminal =

{| class="wikitable" style="background-color:#FFF; color:#656D78;"
|-
! Number
! Name
! Function
! Number
! Name
! Function
|-
| 1
| GND
| Power ground
| 13
| IO10
| GPIO10
|-
| 2
| Relay
| The relay drive port is driven by IO5 by default. If you want to use other I / O to drive the relay, you can remove R14, and then connect the I / 0 of the drive relay to this Relay pin
| 14
| MISO
| Slave output input
|-
| 3
| IO2
| GPIO2; UART1_TXD
| 15
| IO13
| GPIO13; HSPI_MOSI; UART0_CTS
|-
| 4
| IO4
| GPIO4
| 16
| IO14
| GPI014; HSPI_CLK
|-
| 5
| RX
| UART0_RXD; GPIO3
| 17
| ADC
| A / D conversion result. Input voltage 0 ~ 1V, value : 0 ~ 1024
|-
| 6
| 3V3
| 3.3V power supply
| 18
| 3V3
| 3.3V power supply
|-
| 7
| SCLK
| clock
| 19
| MOSI
| output Slave input
|-
| 8
| IO15
| GPIO15; MTD0; HSPICS; UART0_RTS
| 20
| IO9
| GPIO9
|-
| 9
| IO0
| GPIO0
| 21
| CS0
| Chip Select
|-
| 10
| IO5
| GPIO5
| 22
| IO12
| GPIO12; HSPI_MIS0
|-
| 11
| TX
| UARTO_TXD; GPIO1
| 23
| IO16
| GPIO 16
|-
| 12
| 5V
| 5V power supply
| 24
| GND
| Power ground
|}