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. The starter pack didn't give any heads up about this. 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.I've been using multiple resistors for the blue led, but to simplify my breadboard i want to just use one. The problem is, I don't know which one to use or purchase. I went to Radio shack and asked the people there. They didn't know, and they tried a Google search but were unable to tell me which resistor is needed. I'd like to get all these resistors in one trip. Green led appears to work well with a 220kWhich resistor is needed for the red led? 220k is my guess but I want to make sure, these leds cost $2 a pieceWhich resistor is needed for a yellow led?Which resistor is needed for a blue led? All these led's that I have are the ones that come in the standard Arduino starter packs. I also have a clear one but it doesn't have three prongs like the 5mm, tricolor RGB... It only has two prongs. I haven't messed with it yet, but it must have come in the other starter pack. 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. If that requires a different resistor please let me know as well.
Do you know that an LED can fail short circuit as well as open so putting it in seriese is no garenteed that no indication equals no relay activation
Are leds like Christmas lights by the way? The theory is, if the led goes out, the relay will not turn on.
If you want a fail safe indicator system like you say you need a double pole relay. Use one pole to switch your load and the other to switch the LED.
Also, a 14 V led will not turn on at 5V. That's physics. The one you are running on 5v cannot be the 14v led.
I never took a physics class. I'm going to consider putting that on my list of things to do.
Can you explain the difference in using a double pole, and putting the led in parallel with the relay? To my understanding a double pole would have two gates. They would both "energize" at the same time, but one pole would connect the circuit to the dangerous tinkering objective that I want to know if is hot, the other pole would connect the circuit to the led, but the led could still burn out and I would never know until I met the bad news bears.
We can help you but you need to help yourself by doing some research. There' s literally thousands of links explaining relays and leds. You could at least Google the subject see what a DPDT relay is.
If you want to know if the relay is energized, just put a low resistance resistor in series with the coil and measure the
I would like to have a visual indication
1. Are you saying if a led burns out, it will not break the circuit?
o my understanding a double pole would have two gates.
but one pole would connect the circuit to the dangerous tinkering objective that I want to know if is hot, the other pole would connect the circuit to the led, but the led could still burn out and I would never know until I met the bad news bears.