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$4 Wemos D1 mini ESP8266 Board Supports Shields with a Temperature Sensor, a Button, a Relay, or a micro SD slot - CNX Software
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Quick test Amazon Echo Dot (Alexa): ESP8266 WEMOS - Relay 3v DFRobot - Emulating WeMo Switch - PDAControl
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ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (5pcs) : Electronics
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