Pre-Adjusted Hct01 With An Initial Accurate Circuitry With Frequency Output; Schematic Circuit Diagram; Bill Of Material - E+E Elektronik HCT01 Developer's Manual

2 Pre-adjusted HCT01 with an initial accurate circuitry
with frequency output
The circuitry in Fig. 2 delivers a frequency output signal, where the period of the signal is proportional
to the capacity of the RH sensor and consequently with the relative humidity at the sensor. The
accurate measurement of the period requires a precise time base such as a quartz crystal.

2.1 Schematic circuit diagram

2.1.1 Bill of Material

Quantity Symbol
1 pc HCT01 Humidity sensor
1 pc IC1
1 pc C1
1 pc R1
2 pcs R2, R3
2 pcs R4, R5
Rev. 0.2 / 09 /2015
Figure 2: Circuitry with frequency output
Device
HCT01-02 or HCT01-03
Existing
comparator
Capacitor 100 nF, ceramic
Resistor
Resistor
Resistor
Dimension
E+E Elektronik
MCP6561T
82 kΩ
100 kΩ
1 kΩ
AN1111-2
Supplier
Microchip
6