Humidity can be measured in several ways, but Relative Humidity is the most common. In order to understand relative humidity, it is helpful to first understand absolute humidity. Absolute Humidity is the mass of water vapor divided by the mass of dry air in a volume of air at a given temperature. The hotter the air is, the more water it can contain. Relative humidity is the ratio of the current absolute humidity to the highest possible absolute humidity which depends on the current air temperature. A reading of 100 percent relative humidity means that the air is totally saturated with water vapor and cannot hold any more, creating the possibility of rain. This doesn't mean that the relative humidity must be 100 percent in order for it to rain. It must be 100 percent where the clouds are forming, but the relative humidity near the ground could be much less.
HSM-20G is an analog sensor. If you go through the datasheet of HSM-20G, you will find out that they have given output voltage data from the humidity sensor for certain relative humidity values and they have plotted a graph too.
Same with the Temperature Sensor this sensor too is connected to an ADC (analog to digital converter) in order to get the output in digital.
In order to use this sensor, a connector cable was build to connect the sensor to strip board. 4-pin header was connected to the circuit required such that:
- (-) negative pin connects to GND
- (+) positive pin connects to Vcc
- H (humidity sensor) pin which included 47µF capacitor and 100KΩ resistor and connects to ADC.
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ReplyDeleteleh tau mane leh bli sensor ni?
ReplyDeleteI need the flowchart of HSM-20G please as soon as possible and thakns before.
ReplyDeletehello. i want to ask you where did you bought HSM-20G?
ReplyDeleteCan you explain the working principle?
ReplyDelete