Light

Question 1

What sensor detects flame? How does it work?

Answer 1

KY-026; reports the level of infrared light with change of resistance

Question 2

Two ways to measure flame using KY-026 flame sensor?

Answer 2

digitalRead()

analogRead()

Question 3

How is precession set in a flame sensor?

Answer 3

Using the built-in sensitivity resistor; adjusted so ambient light won’t trigger it

Question 4

What is an LDR? What does it do?

Answer 4

Light dependent resistor or photoresistor; it changes its resistance according to levels of visible light

Question 5

When does resistance of photoresistor decrease? The term used to describe it?

Answer 5

when there’s increasing light; photoconductivity

Question 6

How to know which direction light is coming from when using LDR?

Answer 6

Use heat shrink tubing to make a hood for the sensor

Question 7

How does Line detector work?

Answer 7

lighting the surface below it with infrared light, if enough light is reflected back it is called white otherwise it is line