3.1.1 Inputs and outputs

Questions from the packet:

• A potentiometer ranges from 46-5000
• You can change the direction or speed of motors by changing it in robo pro by clicking on it or switch the wiring
• Photoresistors get lower when they get closer to the lamp or light
• Phototransistors get higher when they get closer to the lamp or light
• The phototransistors function can be change by switching the program
• Reed switches detect magnetic fields created by electromagnets and behave normally when they are open

1. Examine the wire diagram on the mini switch and describe how the diagram relates to the concepts of normally open and normally closed.

• When the switch is normally open it starts as 0 and goes to 1 when pressed
  
• When the switch is normally closed it does the opposite it start at 1 and goes to 0 when pressed

2. If computers only understand digital signals, then how is a computer able to interpret the analog signals coming from the interface?

• Computers can understand analog signals by converting them to digital signals and the using its intellect to convert it back

3. Why does resistance decrease as the NTC Resistor becomes warmer?

• The resistance decreases because the warmer it gets (temperature going up) the easier it is for the current to flow