Ok, I'm missing a bit a page where you can discuss ongoing projects so I'm doing a little experiment with this little build-along where I will post my ongoing progress on this lamp. Feel free to comment/suggest at any point. (Although I'm afraid I figured out most of it by the time now.)
There you go:
This lamp schould feature a total of 13 RGB-LEDs and 13 White LEDs to provide mood light as well as the possibility for white light for example to read. This lamp also features 9 capacitive buttons to control the various functions. The whole construction is being mounted on the backside of an A4 sized picture screen.Starting:
The first thing I did was find out whether I was able to get the touch-buttons to work. The IC I used is the Atmel QT100A which provides one touch button.
After a lot of research and digging through various touch button guides, I started creating a mini prototype board for the chip. The problem I encountered was however that there seemed to be no concrete example on resistor and capacitor sizes for the schematics. So I took a wild guess and ordered the parts.
which... luckily worked out quite well :-)
Cs = 22 nF
Cx = 12 pF
Cb = 100nF
Rs = 4.99 kOhm
Although, the touch buttons are quite sensitive, even through the glass plate it should work fine.
If anyone wants to make something similar, decreasing the capacity of Cs should work to decrease sensitivity.
Here you go test design:
And Mass production:
And conclusively testing:
So much for this first episode, stay tuned in for further progress!