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Industrial 6-Channel Relay Module for Raspberry Pi Zero, RS485/CAN bus, power supply isolation, photocoupler isolation | RPi Zero Relay
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1 2 4 6 8 Channel DC 5V Relay Module One Way With Optocoupler Low Level Trigger Expansion Board For Arduino DIY Kit Raspberry Pi
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The 16 relay module and the Raspberry Pi: not an ideal marriage – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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