Arduino Temperature, Humidity and Dew Point Via Hurimel HS1101 Sensor Interface

A great option for adding temperature and humidity (and dew point) measurement to the Arduino (and freeduino) is to use the Hurimel HS1101 sensor.? It is packages as a small board, approximately 1" x 2" with 4 screw terminals.

The only electrical connections are these 4 - 1 for ground, and 3 I/O pins used on the Arduino - 1 analog and 2 digital.?? The pin references used in this article are taken from a Freeduino BBB board.

The 4 pins on the Hurimel are THERM, PULSE, GND and V+.?? Besides a connection to ground on the Arduino, 3 additional pins will be required - an analog and 2 digital pins.? One digital pin is used to provide power (+5VDC), in this example, pin 2 is connected to the V+ screw terminal on the Hurimel.?? Digital pin 5 can be used to count the pulses, connected to the PULSE screw terminal on the Hurimel.? Finally an analog input is required for the temperature reading.? Analog pin A5 on the Arduino connected to the THERM screw terminal on the Hurimel.? Note that a 10k resistor must also be placed between 5V and analog pin A5 on the Arduino.

In summary, the electrical connections in this example are:?

Arduino BBB digital pin 2? -- Hurimel V+ screw terminal
digital pin 5 -- Hurimel PULSE terminal.
GND pin/connection -- Hurimel GND terminal.
Arduino BBB analog pin A5 -- Hurimel THERM terminal.
analog pin A5 -- 10k resistor -- Arduino BBB GND +5v DC pin/connection

In a future article, the Arduino source code required to read the temperature, humidity and dew point measurements will be discussed.

Check out http://www.n1van.com for more Arduino and electronics!

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Dew Point Meters

Dew Point Meters are special devices designed to measure temperature to deterring the dew point, it is the name given to a certain temperature. A constant biometric pressure of air must be cooled for water vapour to condense, the condensed water vapour turns into water; this whole process takes place when the dew point is met. It is a saturation point, but when the point falls below freezing it changes to what is known as the frost point, this is because the water vapour stops turning into water but changes in to hoarfrost or frost by deposition.

The meters are used to determine when this 'certain point' is met; it uses sensors to detect changes in temperature and humidity. Relative humidity is associated with the dew point and the closer to the current air temperature it is a high relative humidity would be indicated.

The measurement of this point is most commonly required during in field application of paint systems and in fact the meter used to measure it becomes the most critical analysis device. Another name given to this meter is the Dewpoint Gauge and was invented by TQC, this model was designed specifically for the coating industry and is the most used measuring device in that industry. This device also falls under another name that is more likely to be used in shops, if you are looking for this device but can not find it try asking for a 'Dewcheck'. There are a lot of suppliers available you just need to look around.

If you are in need of this service check out our product pages, they contain many companies that specialise in this. Wesley Clarke writes about Dew Point Meters. Visit the Businessmagnet product page for details and suppliers of Dew Point Meters.

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