Review on Sonoff WiFi Smart Curtain Switch with Power Metering: TUV Certified, DualR3 Dual Relay DIY Curtain Control for Blinds, Roller Shutter. Two Way Smart Switch, Compatible with Alexa & Google Assistant. by Justin Spoja

This is a big improvement over R2 which is great on its own and I have about a dozen. Back in November 2020, I submitted a request to itead to use the ESP32 to be able to do OTA upgrades (tick), make it a bit smaller to run in a waterproof IP66 case (tick) and the Add ability to access more GPIO pins on the ESP32 (unfortunately unchecked here). Although there is some glue on the case on the 4 tabs that hold it together, it can still be hacked by opening it up, soldering the wires to the TX/RX/GND/3V3 pins and pressing the button when it's powered on is. I only used it for a few minutes with the default software, but after adding it to eWeLink, Alexa recognized it and I switched it from blind mode to normal mode. and played one minute. then I hacked it, plugged in a CH340 USB dongle, wrote custom firmware for it and was able to use: GPIO27 relay1GPIO14 relay2GPIO13 status_ledGPIO0 buttonGPIO32 Switch 1GPIO33 Switch 2 I would give it 5 stars if they made another GPIO accessible via pads or through holes: 1-wire and reset GPIO 5SPI for RTD amplifiers: GPIO 18GPIO 19GPIO 23CS for RTDGPIO 12GPIO 15GPIO 25GPIO 35 amplifiers