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Firmware for the Four-channel High-current DC Fan & Pump Controller (0510818A.HEX) The HEX file and MPLAB X project (.c) files for the Four-channel DC Fan/Pump Controller. This updated version (v1.1) has supply voltage smoothing, which makes Cooldown Mode work more reliably, and also fixes a bug causing glitches in some DS18B20 temperature measurements. v1.2 adds further supply smoothing to the sleep logic, to prevent the unit from going into sleep mode and skipping cooldown from longer negative supply voltage spikes. Cat No SC4825. Price: Free Files: Four Channel DC Fan-Pump Controller firmware v1.2 (0510818A).zip (ZIP contains .hex file and source code; 763.8KB) Related to: Project: Low-voltage, high-current DC Motor Speed Controller (October 2018 [print issue] [online issue]) Project: Low voltage DC Motor and Pump Controller (Part 2) (December 2018 [print issue] [online issue]) Other items relevant to these projects: Four-channel High-current DC Fan and Pump Controller PCB [05108181] ($5.00) Add to trolley PIC16F1459-I/SO programmed for the Four-channel High-current DC Fan & Pump Controller (0510818A.HEX) ($10.00) Add to trolley Four-channel High-current DC Fan and Pump Controller PCB pattern (PDF download) [05108181] (Free) Add to trolley