SunFounder 2 Channel DC 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR

5V 2-Channel Relay interface board, and each one needs 15-20mA Driver Current Equiped with high-current relay, AC250V 10A ; DC30V 10A Standard

RELAY MODULE – diymore

Qunqi 5V 2 Channel 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi (2channel-1pc) : Electronics

SunFounder MEGA Board Compatible with Arduino IDE ATMEGA2560 ATmega16A – TechMaster

Making your own powerful Controller on the cheap side - Upgrades - Inventables Community Forum

GPIO relay signal cross turns to all relays staying on after Darlington added - Raspberry Pi Stack Exchange

5V pump acting strange - General Electronics - Arduino Forum

2 Channel DC 5V Relay Module-Low Level Trigger

2pcs 8 Channel DC 5V Relay Module with Optocoupler for R3 Mega 2560 1280 DSP Arm 16077

DC 5V 8 Channel Relay Module DC5V Low Level for SCM Household Appliance Control for Arduino Raspberry Pi DIY Kit

1 Channel Relay Module Interface Board Shield for Arduino 5V Low Level Trigger One PIC AVR DSP ARM MCU DC AC 220V - Yahoo Shopping

2-Channel 5V Relay Module - RobotShop

RELAY MODULE – diymore

1 Channel Relay Module Interface Board Shield for Arduino 5V Low Level Trigger One PIC AVR DSP ARM MCU DC AC 220V - Yahoo Shopping

Siri/iOS HomeKit Garage Door Control w/Raspberry Pi – Part 1: Hardware