Attached is a picture of my Arduino board. I have it setup so that if I wave my

Question

Attached is a picture of my Arduino board. I have it setup so that if I wave my hand above the photoresistor, I can see the effected values in the serial monitor.
I have a speaker I'm connecting to the board with a red wire and black wire. I think I need to use a BJT. I need the program to read the photoresistor and sound an alarm though the speaker is something Blocks the light (like a tripwire). I will be using an iPhone flashlight and passing my hand over it. The alarm has to be triggered instantly and CANNOT stop. It has to be looped infinitely.

Explanation / Answer

You need to use conditional statement for alarming system.

IF and Else

For an example

your need speaker triggered at value when analog value is greater than 100

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---