![]() ![]() ![]() The specs will usually show brightness as mcd at the rated current. There are "super bright" LEDs that are much brighter with the same milliwatts. I also noticed that it was much much brighter than the green and red leds There is a formula for unequal resistors, but the total resistance will always be less than the lowest-value resistor. Two equal value resistors in parallel are half the resistance. Resistors in parallel reduce the total resistance and increase current. Two 100 Ohm resistors in series makes 200 Ohms. Resistors in series sum-up and the current will be reduced. It depends on how you connect multiple resistors. ![]() Resistance means "resistance" to current flow.īecause I don't have many blue led's I figured to play it safe and use multiple resistors. Higher resistance means less current ( Ohm's Law). So are you saying a 100 Ohm resistor should be enough that the 220k used in the examples is just to play it safe? I did notice with the amount of resistors that I used to get it to appear to be a similar brightness as the red, and green led's, if I hooked a red or green led to the same resistor set up, they were so dim that you could barley tell they were on at all. It is much brighter than the other bulb, but doesn't last very long.īecause I don't have many blue led's I figured to play it safe and use multiple resistors. I also noticed that it was much much brighter than the green and red leds so I figured what likely happened is the same thing that will happen to a light bulb if you use one that is rated for less wattage than the device you are attaching it to. I noticed the first blue led I used worked well for a while, but after a while it died. For some reason I only have 3 or 4 blue ones, where I have upwards of a dozen each of the green and red ones. At most i'd probably pay 40 cents for one, but even that seems like a premium price. I bought two starter packs so I have plenty of led's. If that requires a different resistor please let me know as well. I do have some plastic strips that I think were designed to wrap around the led so you can make it whatever color you want. I haven't messed with it yet, but it must have come in the other starter pack. I also have a clear one but it doesn't have three prongs like the 5mm, tricolor RGB. Which resistor is needed for a yellow led?Īll these led's that I have are the ones that come in the standard Arduino starter packs. Which resistor is needed for the red led? 220k is my guess but I want to make sure, these leds cost $2 a piece Green led appears to work well with a 220k I'd like to get all these resistors in one trip. They didn't know, and they tried a Google search but were unable to tell me which resistor is needed. I went to Radio shack and asked the people there. The problem is, I don't know which one to use or purchase. I've been using multiple resistors for the blue led, but to simplify my breadboard i want to just use one. All it says on the Kit Contents paper is that the led's are 3mm which is misleading because it gives the impression that they are all the same. ![]() The starter pack didn't give any heads up about this. I bought the arduino starter pack, and found that the blue led requires more resistors than the green led does or it blows fairly quickly. ![]()
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