17
GPIO7
NC
18
GPIO8
NC
19
GPIO5
The relay switch for the second channel, active high, power-on default
low level.
20
GND
GND
21
RX
Used to program flash UART_RX
22
TX
Used to program flash UART_TX
23
3V3
Power supply
24
RST
External reset signal: active at low level, externally need to pull up a
10K resistor to 3.3V, and connect a 100nF capacitor to ground.
4.Function Description
4.1. Module function
PSF-B04 module can be used as a 4-channel switch, which can control the switch locally
or remotely through APP.
The following is the function description:
1. Pairingmethod: quick pairing mode / compatible pairing mode.
Press and hold the button (IO0 pull-down, default high level) for more than 5s to enter
the quick pairing mode. When it is in the quick pairing mode, press the button for more
than 5s again to enter the compatible pairing mode. APP can be configured in both
modes. Please refer to 4.3 for details of the configuration method.
2. Switch:
3. In the normal state: click the button (pull down any IO port of 4 channels for more than
100ms) to control the relay on and off (four relay switches corresponding IO port output
high/low level)
4. In the pairing mode: click the button to exit the pairing mode.
