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The RPi Relay Board gives your Pi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent.

• Supports Raspberry Pi A /B /2B/3B
• High quality relays, loads up to 250VAC/5A, 30VDC/5A
• 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

1. Raspberry Pi GPIO interface: for connecting Raspberry Pi
2. Relay screw terminal: for connecting target devices
3. Relays
4. Photocoupler: PC817
5. Relay indicator
• LED on: relay NC is opened, NO is closed
• LED off: relay NC is closed, NO is opened
6. Power indicator
7. 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

Wiki : www.waveshare.com/wiki/RPi_Relay_Board

Package Includes:

1. RPi Relay Board x 1
2. RPi screws pack (2pcs) x 1

Sonoff Dual is a WiFi based 2 gang switch that can connect and independently control two connected appliances or lights. This simply means 1 Sonoff Dual control switch equals to 2 Sonoff basic switches! Sonoff Dual 2 gang light switch inherits Sonoff Basic switch’s advantages such as easy installation and operation, quick WiFi access, remote control through APP EweLink.

In the application eWeLink, available on both iOS and Android, users can independently turn on/off each of the two connected devices. But the button on Sonoff Dual 2 gang WiFi light switch is not an ON/OFF toggle switch, it is only a WiFi pairing button. Users can set single/repeat/countdown timing schedules to turn on/off at a specified time, and also share with others so that they can control together.

Works With Amazon Alexa

You can ask Alexa to turn on/off Sonoff Dual.

Standard voice control commands phrases for Sonoff Dual (if you just say the device name, Alexa will turn on/off all the 2 gangs immediately):

Alexa, turn on {deviceName}
Alexa, turn off {deviceName}

Alexa, turn on {deviceName} {gangName}
Alexa, turn off {deviceName} {gangName}

Explanation: if the device name of your Sonoff Dual is "My Switch", the gang name is "Gang 1", then you can control with "Alexa, turn on My Switch Gang 1".

For detailed tutorial, please click here.

Check out the amazing features of this product below:

Features

• Remote turn on/off through the APP EWeLink
• Independently control 2 devices in APP EWeLink
• Supports tracking device status on EWeLink
• Supports setting countdown, single and repeat timing tasks
• Works with Amazon Echo, Echo Dot, Amazon Tap
• Works with Google Home, Google Nest
• Works with IFTTT

Specifications

• Power Supply: 90-250V AC
• Max Current: 16A(2 gang),10A(1 gang)
• Max Power:  3500W(2 gang) / 2200W(1 gang)
• Product Dimensions: 114*52*32mm
• Color: White
•  Frequency: 802.11 b/g/n 
• Security Mechanism: WPA-PSK/WPA2-PSK
• Humidity: 5%-90%RH, Non-condensing
• Enclosure Material: Fire-retardant ABS V0
• Operating Temperature: 0ºC-40ºC(32°F-104°F)
• Gang: 2
• Certification: CE, RoHS, FCC

Package

1 x Sonoff Dual

Product: light control sensor

Power source: 220V

Rated Current: 10A 

Ambient temperature: max 55 (C)

In switching power supply designs, the input voltage is no longer reduced; instead, it's rectified and filtered at the input. Then the voltage goes through a chopper, which converts it into a high-frequency pulse train. Before the voltage reaches the output, it's filtered and rectified once again.

• Input: AC100-240V 50/60Hz
• Output: DC 12V
• Shell Material: Aluminum
• Safety Compliance: CCC / CE /Rohs
• High price-effective, reliability with industry standards
• 100% full load burn-in test
• Universal AC input / full range
• It's good quality & high performance
• Cooling by free air convection.
• Not suggested for use in a bathroom
• Built-in over voltage, over current, and short circuit protection
• Working Temperature: 0~40℃
• Storage Temperature: -20~60℃
• Ambient Humidity:  0~95% Non-Condensation

• Switch power supply, convert AC 110V/240V to 12V
• Wide input voltage range, steady and precise output voltage.
• Shortage protection, overload protection over voltage protection.
• Widely used as the power adapter for Led strip, LED display, billboard, industrial equipment, etc.

This Reflective IR Sensor is a simple plastic casing with two elements - an IR LED and an IR phototransistor. You can control the IR LED and turn it on to bounce IR off objects to determine their reflectivity. White & light colored stuff will bounce the light, so you can detect it.

Specifications:

• 250 V
• 3A
• 10mm x 15mm