I'm attempting what seems to be a simple project but getting confused due to my lack of knowledge with small electronics (in regards to voltage, etc.) and hoping someone may be able to help! Here is what I've got (it may be horribly wrong):
Where the red dot is I'm guessing I should place a resistor so that it's not sending 9v to the LED (and i think i can use one of those resistance calculators to do that) but I wanted to make sure that's what I needed before I buy them. Also, i believe the potentiometer would go in this circuit so that I could adjust the sensitivity, but I'm not sure which one I need to get. There were several at radioshack and I wasnt sure what size or what rating? to get.
Any help is greatly appreciated! Thanks in advance.
Where the red dot is I'm guessing I should place a resistor so that it's not sending 9v to the LED (and i think i can use one of those resistance calculators to do that) but I wanted to make sure that's what I needed before I buy them. Also, i believe the potentiometer would go in this circuit so that I could adjust the sensitivity, but I'm not sure which one I need to get. There were several at radioshack and I wasnt sure what size or what rating? to get.
Any help is greatly appreciated! Thanks in advance.