The Solution
When you begin discussing multiple wavelength adjustments in every light the problem becomes how are you going to control it?
We would not want to see the control of every light in our house start to look like mission control for a space launch or the mix board for a concert.
We need a more diverse and dynamic control for the user that is simple and yet accomplishes the goal that the user is after.
The solution that our team has formulated is a capacitive touch matrix that allows the user to simply slide their finger inside the matrix to control both the brightness and the color temperature that they desire.
Capacitive Touch Matrix
The solution I came up with was to use capacitive touch sensing electrodes and arrange them in a slider, buttons, and matrix scheme.
To the left you can see the finished product.
The matrix work by having the Y-axis control the brightness of the lamp and the X-axis controls the color temperature of the lamp.
The buttons are predefined to have set color temperatures. When pressed, the "Warm" button will turn only the 2400K LEDs on at full brightness. "Cool" turns on the 6500K LEDs at full brightness and finally "Neutral" turns on both the 2400K and the 6500K LEDs at half brightness each. "Off" turns everything off.
The slider is simply a brightness control. If you find a color temperature you like on the matrix or with one of the predefined buttons you can keep it and only control the brightness with the slider.