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
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
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