My circuits knowledge is limited at best so I need a little help with this.
I know the basics, unfortunately I don't know enough to do this. First, a backstory: Ever since our neighbors built a house above ours, delivery people constantly make mistakes and deliver stuff to them, it's getting annoying, even though I have numbers on my mailbox and my house.
The numbers on my house are just plastic numbers with no lights. I want to put some LED's in the numbers to light them up.
What I was thinking was 10 (3-4 per number) 5mm high-brightness 20mA, 3.2v LEDs running off one or 2 9v batteries. I know how to wire up a single LED but I don't know about multiple. I used a calculator which said for wiring it up in parallel I would need a 33 OHM, 2W resistor.
This is where I'm stuck. My local RadioShack only sells resistors up to 10, 100 and 1K OHM, 1W resistors.
Any help is appreciated. By the way, I also do have an outlet right above the numbers if I need to draw more power, but I would rather not get into using high voltage.
I know the basics, unfortunately I don't know enough to do this. First, a backstory: Ever since our neighbors built a house above ours, delivery people constantly make mistakes and deliver stuff to them, it's getting annoying, even though I have numbers on my mailbox and my house.
The numbers on my house are just plastic numbers with no lights. I want to put some LED's in the numbers to light them up.
What I was thinking was 10 (3-4 per number) 5mm high-brightness 20mA, 3.2v LEDs running off one or 2 9v batteries. I know how to wire up a single LED but I don't know about multiple. I used a calculator which said for wiring it up in parallel I would need a 33 OHM, 2W resistor.
This is where I'm stuck. My local RadioShack only sells resistors up to 10, 100 and 1K OHM, 1W resistors.
Any help is appreciated. By the way, I also do have an outlet right above the numbers if I need to draw more power, but I would rather not get into using high voltage.