Note. A compact analogue reflectance sensor such as the CNY70 was not used in the Arduino Uno experiments described. Instead, a homemade sensor was assembled using a single infrared LED (IR333C) and a ...

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Manual uplink: Hold button for 3 seconds Or press button 3 times within 2 seconds Hold button for 3 seconds Or press button 3 times within 2 seconds Uses dummy values if DHT11 fails to read LCD shows: ...