This is an accurate LM35 analog temperature sensor library for Arduino with noise cancellation. This library changes analog pins to ADC 1.1V internal reference voltage which affects all analog pins.

LM35 Sensor: Connect VCC of LM35 to 5V on Arduino. Connect GND of LM35 to GND on Arduino. Connect the output pin of LM35 to A7 (analog input) on Arduino. LEDs: Connect the long leg (+ve) of each LED ...

If we are looking at the 4-pin sensor the extra pin is a NC pin, and it has no functions. The pin diagram of both the module and the sensor is shown below. DHT22 Module Pinout. The diagram below shows ...