- Joined
- Jan 2, 2014
- Messages
- 9,042
.....a couple more things;
- LEDs are strictly DC devices; ensure your supply is DC
- the series resistors values do not have to be exact; look at the tables for how much the resistor value changes the current- just try and get it close. You can use multiple resistors in series, just add their values together.
- LEDs care about polarity; if you hook it up backwards it will NOT light up! So if you think you have the proper resistor value and it's not lighting up, try turning around the LED; it won't harm it being backwards it just won't work!
- This is all pretty safe with fairly low voltages and low currents. You are more likely to get hurt by poking yourself with a screwdriver or a burn from a soldering iron....