Combining Sketches

I am a student and new to Arduino microcontroller. My project is a Wireless Environment System which includes sensors (photocell, temperature and humidity). I decided to write the sketches (program) in section and now I have to combine them.

Can someone give me suggest on how to combine my sketches so they can work together.,97455.0.html You read this, didn't you?

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Here's one way:

Put all the parts that go before void setup together. Put all the parts in void setup together. Write a blink without delay section to run the rest quasi- concurrently:

add these to your declarations: unsigned long previousMillis(); byte sketchSelect = 0;

void loop(){
if (millis() >=previousMillis){
previousMillis = previousMillis+100; // each gets 100mS, then next one start
sketchSelect = sketchSelect +1;
if (sketchSelect == 4){ sketchSelect = 1;}
switch (sketchSelect){
case 1:
// sketch 1
case 2:
// sketch 2
case 3:
// sketch 3
} // end switch
} // end loop

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