Intelligent humidity measuring instrument circuit composed of the HM1500/1520 humidity sensor and single-chip microcomputer

Published:2011/7/6 2:14:00 Author:Christina | Keyword: Intelligent, humidity measuring, instrument, humidity sensor, single-chip microcomputer | From:SeekIC

The intelligent humidity measuring instrument circuit which is composed of the HM1500/1520 humidity sensor and single-chip microcomputer is as shown in the figure. This instrument uses the +5V power supply, and has 4 common cathode LED digital tubes. This circuit uses three ICs: IC1 is the HM1500/1520 humidity sensor, IC2 is the 10-bit ADC single-chip microcomputer PIC16F874 which is produced by the United States Microchip company, IC3 is the 7 darlington invert driver array MC1413. The PIC16F874 is designed as one kind of cost-effective 8-bit SCM, it has the successive approximation type 10-bit A/D convertr, and it can convert 8 channels of humidity signal, now we only use one of the 8 channels.



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