Sonoff PSF-B Series User Manual

3.3. Pin definition
Pin definition and function description
Pin
Name
Features
1
ANT
Wi-Fi Antenna Note: PSF-B04 cannot be used
2
ADC
ADC interface, input range: 0-1V
3
EN
Chip enable terminal high level: valid; low level: closed.Note: An
external pull-up resistor of 1~10K, connect a 100nF capacitor to the
ground.
4
GPIO16
Main switch for 4-channel pin, active low. APP configuration pin, when
the low level> 5S, enter the pairing mode.
5
GPIO14
The switch for the fourth channel pin, active low. APP configuration
pin, when the low level> 5S, enter the pairing mode.

Sonoff PSF-B Series Specifications

General

Brand	Sonoff
Model	PSF-B Series
Category	Wireless Router
Language	English