3.6.1.2 Fan Speed Monitoring

To ensure the main cooling fan is functional, the design uses Timer2 to count the number of fan tachometer pulses. If the pulse count is 0 at any point while the system is active, the Peltier is shut down and a soft error is sent to the User Interface (UI). Timer4 is also used to monitor Fan 1 but does not shut down the system if no pulses are detected, as this is an auxiliary fan.

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