How to use a popular 1 channel webstore relay on 3V3 / Re-inverting an inverting relay – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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Amazon.com: AITRIP 10PCS 5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger Compatible with Arduino Raspberry pi ARM AVR : Industrial & Scientific
16-Channel 12V Relay Module – SainSmart.com
5V Four 4 Channel Relay Module With optocoupler For PIC AVR DSP ARM Arduino 8051 | eBay
5V 1-Channel Relay Board Module for Arduino Raspberry Pi ARM AVR DSP PIC | eBay