Bought a set of LED fairy lights of eBay, described as multimode (i.e.
various more-or-less irritating flashing modes and one steady on) but
able to remember the last setting (simply 'static' sets seem to be like
hens' teeth these days, at least in warm white, so this was next best.)
Needless to say when the bastard things arrived they don't seem to have
the memory function - if I press the button however many times to put
them in steady mode then turn them off and on again they're back to
annoying flashing mode. Is there some cunning way to make them memorise
the last setting that I haven't sussed or are they useless?
Praying is talking to yourself and pretending someone intelligent is
There's almost certainly some type of delay before saving
to non-volatile memory, because the NVRAM in many of the tiny
cheap microcontrollers can only be written a relatively few
times, and if it saved it on every button press, it would
quickly wear out.
The scheme above would achieve this. Another is that such
configuration is only saved about a minute after it's set,
so if you power-cycle it too quickly, it won't be saved.
[email address is not usable -- followup in the newsgroup]
On Fri, 21 Dec 2012 19:17:31 +0000, Andrew Gabriel wrote:
Thanks for that everyone. Tried holding button down on the press needed
to get it to steady, and leaving them on for several minutes before power
cycling them, and they still go back to manic annoying mode. Plus, having
perused Big Clive's site that John Rumm linked to and looked at the size
of the dropper resistors I don't think I'd want to share a living space
with them that was the least bit combustible!
Almost certainly faulty - return them. Our warm-white LED string
remembers all the modes - including steady on - without any special
measures. In fact, it remembered from last Christmas!
Thanks for that, I have just discovered that our set of the more
annoying ones responds to keeping the button pressed for 10 seconds.
You have to count it round to the display you want, then when you get
to the one just before the one you want, instead of a short press you
press and keep it pressed for 10 seconds. Now on a steady drift from
colour to colour, rather than an annoying and distracting flash.
Hi just bought a set of 300 LED lights, that when you switch them on they d
on't remember the setting you left them on!!! Yep the 10 second rule worked
on this set. We just count through the setting we wanted and left our fin
ger on it for a good 10 seconds on the the one we wanted , it work a treat,
Hi we ve just purchased a set of multi function LED fairy lights for the ga
rden. We have them on a timer so want them to remember the last setting. As
a previous post the only way we can get them to stay on the setting we wa
nt and not start from the beginning is to count though from the start and w
hen you reach the setting you want, do not release your finger, keep it pus
hed down for a good , 10 seconds , it works a treat, thank you
I've got some multimode LED lights which have a dial selector on their
control box. The dial's set at the least annoying light pattern, but the
string as a whole is on a separate external timer. About one activation in
six so far, the lights come on in a wild frenzy and need the dial turned
away from the right setting and back to it again. It doesn't altogether
inspire confidence in whatever is inside the control box - a drunken elf
Jeremy C B Nicoll - my opinions are my own.
Email sent to my from-address will be deleted. Instead, please reply
Well if its anything like some a friend bought, yes they memorise all
modes...... except always on.
Who was the bright spark who thought that up, or is there some reason they
don't like them to be on all the time. I gather that after a time they also
go back to flashing.
Not that it worries me any more .. grin
From the Sofa of Brian Gaff Reply address is active
"John Stumbles" < firstname.lastname@example.org> wrote in message
There could well be a reason for not having them all running at the
same time: To reduce the duty cycle.
This is from the link John Rumm posted
Spectacular. This is a cheap set of Chinese LED lights bought on ebay.
Aside from the fact that the tiny inline resistors are a mix of
values, they are grossly under-rated for the job they are doing, even
if the controller is flashing them on and off. I'd say the resistors
are rated at 0.125 Watts, and in the string that has already smoked
there were three 3000 Ohm resistors in series with about 33 red LEDs.
Given that a typical red LED has a forward voltage of about 2V that
would give a total LED voltage of about 66V leaving 174V to be dropped
across the resistors on a 240V supply. The total resistance of all
three 3000 Ohm resistors is 9000 Ohms, so the average current will be
roughly 19.33mA (which is good) but the dissipation across the
resistors will be 3.36 Watts meaning that even with the current split
over three resistors they are dissipating ten times their rated value!
No wonder they went up in smoke.
This happened while the original controller was still in use and set
at static. I was playing with the LED string while it was on (highly
dubious thing to do given the quality) when I noticed a hot smell and
then felt a burning sensation from one of the resistors. For all it
would have taken to add a few more resistors in series along the
string, I really don't know why China puts stuff like this out.
I also spotted defective wire in the string which actually had wire
strands emerging from the plastic insulation. That's definitely a
serious shock risk. Definitely one for the Chinese deathtrap
Can you still get sets of fairy lights using either 12 or 20 MES
bulbs simply connected in series - none of this fancy flashing stuff,
unless you bought a "flashing bulb" which naturally flashed all the
bulbs in the string?
Tesco do a "value" product consisting of 20 colours bulbs in series
and a non reusable 13A plug.
The bulbs are the traditional push in fairy light type. If really
meant MES torch bulbs I would suggest they were unsuitable on safety
I was surprised that these chains were still available, I thought
everything had to have an isolating LV wall-wart these days.
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