Temperature-Controlled Fan in AVR | Dataford Interview Questions

Embedded C program in a microcontroller (AVR ATmega8): manage the speed of a fan high or low depending on temperature and switch the fan ON or OFF during night 10 pm to morning 11 am

Asked in the technical stage at Rockwell Collins, now Collins Aerospace, embedded technical interview.

Implement the equivalent decision logic as fan_control(temperature, hour, high_threshold). hour is an integer from 0 through 23. Return a dictionary with power, either "ON" or "OFF", and speed, either "LOW" or "HIGH". The fan is OFF from 22:00 through 10:59 and ON from 11:00 through 21:59. When ON, use HIGH if temperature is at least high_threshold; otherwise use LOW.

Constraints

0 <= hour <= 23
-100 <= temperature <= 200
-100 <= high_threshold <= 200
The overnight interval is 22:00 through 10:59
The threshold comparison is inclusive for HIGH speed

Function Signature

def fan_control(temperature, hour, high_threshold):

Your question is Temperature-Controlled Fan in AVR. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Embedded C program in a microcontroller (AVR ATmega8): manage the speed of a fan high or low depending on temperature and switch the fan ON or OFF during night 10 pm to morning 11 am

Asked in the technical stage at Rockwell Collins, now Collins Aerospace, embedded technical interview.

Constraints

0 <= hour <= 23
-100 <= temperature <= 200
-100 <= high_threshold <= 200
The overnight interval is 22:00 through 10:59
The threshold comparison is inclusive for HIGH speed

Function Signature

def fan_control(temperature, hour, high_threshold):

Your question is Temperature-Controlled Fan in AVR. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.