cloud-based-waste-monitoring-system Hardware NodeMcu HC-SR04 Ultrasonic Sensor Software Arduino IDE Installation Install ThingSpeak Library and ESP8266wifi-master Installing Libraries guide Connections ultrasonic sensor -> NodeMcu module trig pin -> D0 echo pin -> D1 gnd -> gnd Vcc -> Vin Sending sensor data to ThingSpeak Send the sensor data from NodeMcu to ThingSpeak