Robotics (DHT22)

measures the average kinetic energy of air molecules,

reflecting how “hot” or “cold” the air is

expressed in °C, °F, or °K

measured by a Thermometer

Temperature

measures the amount of water vapour in the air

indicates the likelihood for precipitation, dew, or fog to be present

expressed in % (percentage)

measured by a Hygrometer

Humidity

Temperature and humidity have an?

Inverse Relationship

If temperature increases, it will lead to a ______in relative humidity, thus the air will become drier

Decrease

Whereas, when temperature decreases, the air will become wet means the relative humidity will?

Increase

the percentage of water vapor present in the air compared to the maximum amount the air can hold at that temperature

Relative Humidity

is equal to the current temperature and that the air is maximally saturated with water

Dew Point

a low-cost, digital temperature and humidity sensor

DHT 22 Sensor Module (AM2302)

It is used to measure the surrounding air, then processes those signals with an onboard microcontroller to output calibrated digital data on a single data pin-

1. Capacitive Humidity Sensing

2. Thermistor

Operating voltage:

3.3 V to 5.5 V

Operating current:

up to 2.5 mA during measurement, ~60 µA standby

Sampling rate:

up to 0.5 Hz (one reading every 2 seconds)

Temperature range:

−40 °C to +80 °C Temperature accuracy: ±0.5 °C

Humidity range:

0 % to 100 % RH

Humidity accuracy:

±2 % to ±5 % RH

STEP1 : Declaration of Variables

STEP2 : Initialization of the components

STEP3: Program the components that need to be executed repeatedly