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Tanbupu 3PCS Relay Module 5V DC 1 Channel Relay Switch Board with OPTO-Isolated High Or Low Level Trigger Board for Arduino X-002-1-5VDC: Amazon.com: Industrial & Scientific
5V-24V 1/2/4/6/8 Channel Relay Module Arduino PI ARM AVR DSP PIC ESP32 ESP8266 – ASA College: Florida
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