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Amazon.com: 30A 4 Channel Relay Module Expansion Board for Raspberry Pi DSP AVR PIC ARM (12VDC) : Electronics
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Amazon.com: LGDehome 2pcs DC 5V 4 Channel Relay Module with Optocoupler for Arduino UNO R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi : Electronics
Electronics-Salon 4 DPDT Signal Relay Module Board, DC 12V Version, for Arduino Raspberry-Pi 8051 PIC.: Amazon.com: Industrial & Scientific
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Amazon.com: HiLetgo 2pcs 5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger : Industrial & Scientific
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Amazon.co.jp: Dovewill Raspberry Pi 12V 2 Channel Relay Module Leveltrigger, High Quality : Industrial & Scientific
