Arduino kit project 3 sensors covered in coloured gel.
I do get the serial screen full of numbers but no matter what I do It makes no difference to the serial print even if I shine a torch directly at the sensor or if I pull one or all three from the bread board
Does any one have a clue what basic step have I got wrong?
I don't know that project (and maybe more users of the forum are like me). Can you post the code, or some link to it?
Sounds like a wiring error. Double-check your connections.
One issue that catches some people is that some larger breadboards have power rails that are split half way.
What numbers are you getting?