3 Channel Relay Module Expansion Board HAT for Raspberry Pi RPI A+/B+/2B/3B+/4

Description

Raspberry Pi Expansion Board, Power Relay
Overview
The RPi Relay Board gives your Pi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent.
RPi Relay Board Features
Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
High quality relays, loads up to 5A 250V AC or 5A 30V DC
Photo coupling isolation, prevent interference from high voltage circuit
Onboard LEDs for indicating relays status
Relay control jumper, allows to control the relays by custom pins other than the default pins
Comes with development resources, including examples in wiringPi, WebioPi, shell, python, and bcm2835
What's on the RPi Relay Board
Raspberry Pi GPIO interface:
for connecting Raspberry Pi
Relay screw terminal:
for connecting target devices
Relays
Photocoupler:
PC817
Relay indicator
LED on: relay NC is opened, NO is closed
LED off: relay NC is closed, NO is opened
Power indicator
Relay control jumper
short the jumper: control the relays by default I/Os used in the example code
open the jumper: control the relays by custom I/Os through jumper wires
Photos
RPi Relay Board
RPi Relay Board back view
RPi Relay Board connecting with Raspberry Pi
Control the lamp by mobile phone
Note : the Pi in the photos is NOT included.
Dimensions
Development Resources
Wiki : www.waveshare.com/wiki/RPi_Relay_Board