USER MANUAL AUGUST 2016
MM102
Red wire
5V positive
power supply
Black wire
GND negative
power supply
Yellow wire
Humidity output /
data request
ANALOG HUMIDITY SENSOR BOARD
This breakout board is equipped with a hygrometric sensor, thus
it lends itself to detect the moisture found in the environment it is
placed in. It operates at a very low voltage (it correctly operates at
up to 5.5 Vcc) and typically absorbs 200 microamperes: it is thus
ideal even in applications that are battery powered, and in which a
minimal absorption is required.
The HIH-5030-001 sensor has the great virtue of supplying an
analog output signal, consisting in a DC voltage that varies in an
almost linear manner, as the relative humidity (RH) varies; thus it
may be interfaced both to analog circuits that check the air ow of
a dehumidier installation, and it may be read by an A/D converter
or by a microcontroller’s input that is supplied with an analog/digital
converter.
The device’s sensor component is of the capacitive kind, and it is
composed of thermosetting polymers that have been cut with a laser. The signal’s conditioning circuitry, integrated on a chip, is found in
the integrated circuit. The multilayer construction of the sensitive element provides an excellent resistance to the greatest part of the risks
coming from applications such as, for example, condensation, dust,
lth, oils and common chemical products found in the measurement
environment.
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The measurement accuracy is ÷3%, given that the relative humidity is between 11% and 89%; the response time
to the humidity variations is of about 5 seconds. The variation curve for the device’s output voltage, as a function of
the relative humidity (having a 3.3 V power supply and an environmental temperature of 25° C) is shown in Fig. 1.
The component’s output is an high impedance one, and may pilot circuits having an impedance of no less than
65 kohms; otherwise the voltage supplied as a function of the humidity may not react to the curve shown in Fig.
1, but will vary in a different manner. In addition to the A/D converter, the device’s output may be connected to a
microampere meter having a pointer, or to an opportunely calibrated voltmeter, so to create a veritable hygrometer, from which to obtain a direct indication of the relative humidity.
HIH-5030-001 sensor’s output voltage, as a function of the detected relative humidity.
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