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Summary DHT22 module applies specific digital blocks collection technology and temperature and humidity sensing technology to ensure that products with high reliability and excellent long-term stability. Sensor comprises a capacitive humidity sensing…

LinkNode R4 is an open source 4-Channel relay controller which is powered by the ESP8266 WiFi SoC. The following will introduce how to use Android APP to control the LinkNode R4. Steps 1. Install Android APP Download the APK file from the github and install…