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Human Comfort Indicator firmware & STL files This download package contains the HCI firmware, including the HEX file and MPLAB X project (written in C). There's also a second ZIP file with the 3D-printing STL files for the case. Cat No SC3630. Price: Free Files: 2110526A.zip (ZIP contains .hex, .c & .h files; 98.4KB) HCI STL files.zip (ZIP contains .stl files; 1.4MB) Related to: Project: Human Comfort Indicator (June 2026 [print issue] [online issue]) Other items relevant to this project: Human Comfort Indicator PCB [21105261] ($5.00) PIC24FJ256GA702-I/SS programmed for the Human Comfort Indicator [2110526A.HEX] ($15.00) GY-BME280 module (6-pin/3.3V version) ($10.00) Human Comfort Indicator short-form kit ($60.00) Human Comfort Indicator 3D-printed case (white, portrait version) ($12.50) Human Comfort Indicator 3D-printed case (white, landscape version) ($12.50) Human Comfort Indicator PCB pattern (PDF download) [21105261] (Free)