Transforming a basic SonOff Wifi switch - Sonoff - Universal Devices Forum
Sonoff Basic - Tasmota
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SONOFF Basic R2 10A Smart WiFi Wireless Light Switch, Universal DIY Module for Smart Home Automation Solution, Works with Amazon Alexa & Google Home, Compatible with IFTTT, No Hub Required (1) :
Adding a touch switch to Sonoff Basic
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switches - How to control a Sonoff Basic switch with an Arduino Nano - Electrical Engineering Stack Exchange
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Modify the Sonoff Basic to work with the existing light switch #ElectronicsCreators - YouTube