Unless the voltage is able to rise from 3.2 to 4.2+Nothing will happen, i'd be more worried about the voltage regulator being faulty... if you wish to prove me wrong please do so with actual proof"Not using current limiting will damage the LED"Wrong... so if i take a 5mm LED supply exactly 2v until it glows you CLAIM that it will one day fail because theres no current limiting action?No it wont so stop telling me it will....
QuoteSome people prefer elegance to safety (there is a reason we don't all drive SUVs).So simple equals elegant? You will love these elegant solutions http://failblog.cheezburger.com/thereifixedit/tag/duct-tapeThey are the same thing as you advocate.
Some people prefer elegance to safety (there is a reason we don't all drive SUVs).
QuoteAlso, Mike, I don't think anybody here is building production electronics with their arduinos, as this is not what they are intended for. We just pull out one LED and insert another.I think you will find there are very few people here with that philosophy. Temporary functionality is setting the bar very low.
Also, Mike, I don't think anybody here is building production electronics with their arduinos, as this is not what they are intended for. We just pull out one LED and insert another.
QuoteThe fact of the matter is that LEDs work without a resistor in series. I make no claim as to lifetime, performance, or other specifications, I merely state that they do, in fact, work.Sure they do. What you fail to understand is that there has to be something that limits the current, that need not be a resistor although it is one f the simpler options. That something can be some explicit circuitry or some accidental factor of a specific setup, like the impedance of a battery.
The fact of the matter is that LEDs work without a resistor in series. I make no claim as to lifetime, performance, or other specifications, I merely state that they do, in fact, work.
http://flashlightwiki.com/Driver#Direct_DriveYou religious resistor freaks need to understand that your piddly little LEDs which (wont die if stable voltage is supplied) and high powered ones are not the same hence direct drive!
As far as I can tell, resistors limit voltage, not current.
If you supply the correct voltage and it's a clean voltage the LED does not require current limiting....
Power sourcesThe current/voltage characteristic of an LED is similar to other diodes, in that the current is dependent exponentially on the voltage (see Shockley diode equation). This means that a small change in voltage can cause a large change in current. If the maximum voltage rating is exceeded by a small amount, the current rating may be exceeded by a large amount, potentially damaging or destroying the LED. The typical solution is to use constant-current power supplies, or driving the LED at a voltage much below the maximum rating. Since most common power sources (batteries, mains) are constant-voltage sources, most LED fixtures must include a power converter, at least a current-limiting resistor.