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Some functions were\nremoved or updated. The current idea is to use more arrays and access them by index. At the\ncurrent stage I do not want to use advanced techniques, as we have enough space and memory.\nBasically the serial communication part is complete, only the munin part is left.\n\nItemized:\n\n* General configuration string and bool for enabling and disabling a fan channel.\n* The fan pwm pins are now defined in a single array.\n* The settings are defined in a 5*8 2D array:\n  * manual [0,1]\n  * current pwm value [0-255]\n  * pwm values [LOW[0-255], HIGH[0-255], CRITICAL[255]]\n  * temp values [tLOW[0-85], tHIGH[0-85], tCRITICAL[85]]\n* start interrupt work.\n* set ADC reference to 1100 mV, this increases the resolution of the LM35* sensor.\n* temperature source wrapper.\n* all serial commands.\n* automode: read temperature and update fan pwm speeds accordingly.\n\nNOTE: I used the map() and constrain() functions to convert or limit ranges.\n\nIt compiles in old (1.8.19) and new (2.2.1) Arduino IDE. Arduino Nano.\n\nSketch uses 10460 bytes (34%) of program storage space. Maximum is 30720 bytes.\nGlobal variables use 504 bytes (24%) of dynamic memory, leaving 1544 bytes for local variables. 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The basic idea is to have 5 channels for fan control. Three\nchannels are for 2 or 3 wire fans, and two channels are for 4 wire\nfans. To handle the ~25 kHz requirement, Timer1 speed is changed to ~31\nkHz. For the 4 wire fans a tachometer will be implemented using the\ninterrupt pins. Pins were also assigned for an optional LCD display.\nThe temperature source can be a DS18B20 sensor or an LM35, whichever is\npreferred. The same SerialEvent handler will be used as in my other\nprojects. The if/else structure will be ugly, but it is needed for the\nexternal control and munin integration.\n\nItemized:\n\n- Create header.\n- Assign pins.\n- Reserve pins for LCD.\n- Design serial commands.\n- Setup function.\n- PWM Frequency change to 31 kHz.\n- Read LM35 Temperature sensor function.\n- SerialEvent for external control.\n- Basic for loop.\n\nIt compiles in old (1.8.19) and new (2.2.1) Arduino IDE. Arduino Nano.\n\nSketch uses 4618 bytes (15%) of program storage space. 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