multiple temperature fan speed

Posted on May 8, 2012

The block diagram in Figure 1 represents a complete remote-temperature-sensing and fan-control system. The system uses an Analog Devices temperature-monitor and fan-control ASIC and a PIC16C84 µC from Microchip Technology. The ADM1022 allows you to measure the local temperature and two remote temperatures within a system. An on-chip, 8-bit DAC controls the speed of a cooling fan in response to the measured temperature. This circuit can form the basis of a central-heating/air-conditioning system with minimal component count and cost.

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