Hi, Thanks for the quick responses
I think my original post is a bit confusing. This is a lot more simplistic, even i cant mess it up... hopefully this a bit more intelligible.
Code:
+||-
||
-----||-------
| |
| O <--- LED
| |
-/\/\/\-------
^
____| POT
This is a very basic dimmer switch for the led.
What I am trying to do is to be able to set this led then remove the pot and the led will stay at the last set value of the pot.
I am not too fussed if re attaching the pot resets the circuit to the current pot level.
I am really struggling to find anything that will allow me to do this and I just dont know enough yet to get the most out of google. any hints at all would be greatly received.
I thought I saw something that had a chip in it [*] that would allow me to do this..
Code:
+||-
||
----||------
| |
| O <--- LED
| ___ |
---|_*_|----
| |
| |
|_/\/\/\
^
____| POT
So that I could remove the pot and it would stay at the level it was last set at, but it seems that this is a bit of a non starter, and i cant seem to find the chip :/ how would i go about looking for chips that
might be able to do this? maybe i could mod another type of temp sensor/other chip with a lock function or something? I just seem to be trawling through datasheets at the moment, not really knowing how to be looking for what i want.
Other thoughts that I have had, have been like creating a timing circuit or maybe a few opamps feeding back into themselves or something. I dont know.. im not good enough to be able to think laterally yet, heh.. I am open to suggestions, but i really dont want to have to program a pic, i work with assembler all day, this is my hobby that is going to take me away from that.
A couple of thoughts that I had that would sorta solve this, in the context of the temperature sensor are,
1 - use a dual pot one for the high and one for the low, then have a configuration pot (screwdriver mini type) that would be used to set a ratio, this seems a little bit too complex though and i dont think it will work as i expect.
2 - Use an external thermistor + resistor to make it + 3 degrees above ambient for the low set, then atleast i will only need 4 pots
if anyone cares, this is the chip I am trying to control.
**broken link removed**
cheers,
th.