The Problem

The pushbutton switch (TOUCH2) energizes a temperature warning and maintenance system.  As long as the pushbutton is depressed, the system should operate.  If the switch is deactivated, the entire system should shut down.

If the temperature drops below _______(to be provided), the heat lamp under the temperature sensor should be energized AND a green warning light should blink at 5 second intervals until the temperature is equal to or above the lower limit provided.  When  the temperature is within the zone provided, the light should stop blinking.  The heat lamp should stay on until the temperature reaches the upper limit.

 If the temperature is above __________(to be provided), the heat lamp should be turned off,  the fan should be energized,  AND  the red warning light should blink at 5 second intervals until the temperature is equal to or below the upper limit.    This system should run continuously until the TOUCH2 sensor is deactivated.

NOTE: There should be no warning light as long as the temperature is within the range provided.
Contestants will be allowed one trial run.  The second run will be considered final and the program and solution will be judged.

NOTE: The program is to be written on the programming forms provided.  The program will be entered into the computer exactly as it is written on the forms provided.

OUTPUTS
 Port “A” Controls the fan motor.
   Set the power level to 8
   Set the direction to left

 Port “B” Controls the heat lamp

 Port “C” is connected to the red warning light

 Port “D”  is connected to the green warning light
 
INPUTS
 
 Port 1  Is connected to the temperature sensor
 
 Port 2  Is connected to the touch control switch.

WRITING THE PROGRAM
 The sheet labeled “procedures center” represents the top screen of the Logo software.
 The sheet labeled “Control Center” represents the bottom screen of the Logo software.